Article
Materials Science, Multidisciplinary
Youyou Zhang, Huibin Wu, Xinpan Yu, Di Tang, Rui Yuan, Hui Sun
Summary: In this study, the microstructure and mechanical properties of CrxMnFeNi high-entropy alloy were investigated. It was found that a dual-phase FCC/BCC structure was formed when the Cr content exceeded a threshold value. The presence of BCC phase in the dual-phase alloy significantly increased strength but decreased ductility, showing a good strength-ductility matching mechanism.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
I-An Su, Ko-Kai Tseng, Jien-Wei Yeh, Badr El-Sayed, Chia-Heng Liu, Shing-Hoa Wang
Summary: The metastable beta-type medium-entropy refractory alloy Hf20Nb10Ti35Zr35 was designed to have a ductile BCC structure in the as-solution-treated state and aged to achieve a combination of strength and ductility. The strengthening mechanisms, including transformation-induced plasticity, twinning-induced plasticity, and precipitation strengthening, serve as a basis for alloy design and improving the mechanical properties.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Pengfei Sun, Ning Yan, Shuo Wei, Dengzhi Wang, Wenji Song, Congwen Tang, Jiaxing Yang, Zhidong Xu, Qianwu Hu, Xiaoyan Zeng
Summary: In this study, the effects of W addition on the microstructure and mechanical properties of laser-clad Inconel 718 alloys were investigated. The results showed that increasing W addition led to an increase in Laves phase fraction, low-angle grain boundaries, and dislocation density, while decreasing grain size and interdendritic region. The microhardness, ultimate tensile strength (UTS), and yield strength (YS) of the alloys were enhanced with increasing W addition, but the elongation (El) decreased. The Inconel 718 sample with 12 wt% W addition exhibited the best comprehensive properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
J. L. Yuan, Y. C. Wu, P. K. Liaw, J. H. Luan, Z. B. Jiao, J. Li, P. D. Han, J. W. Qiao
Summary: By tuning the microstructures of the nano-precipitated alloy, different types of precipitates with various morphologies and volume fractions can be obtained. The interaction between the precipitates and dislocations plays a crucial role in achieving a combination of excellent strength and plasticity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Lavanya Raman, Ameey Anupam, G. Karthick, Christopher C. Berndt, Andrew Siao Ming Ang, S. V. S. Narayana Murty, Daniel Fabijanic, B. S. Murty, Ravi Sankar Kottada
Summary: This study investigated the strengthening mechanisms of as-cast CrMoNbTiW BCC refractory high entropy alloy, finding that solid solution strengthening is the dominant mechanism. The predicted yield strength at high temperatures is significantly affected by temperature-dependent material constants, with the absolute value depending on the shear modulus and the variation with temperature influenced by Poisson's ratio. It was also shown that high temperature yield strength can be predicted using material constants from literature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Zhongsheng Yang, Zhijun Wang, Bojing Guo, Rongtian Cao, Qingfeng Wu, Dingcong Cui, Kaiwei Zhang, Junjie Li, Jincheng Wang, Feng He
Summary: This study investigated the effects of pre-strain degree on the precipitation behavior of Ni2CoCrFeTi0.18Al0.12 high-entropy alloys. The results revealed a non-monotonous effect of pre-strain on the precipitation behavior, where low pre-strain can accelerate the precipitation while high pre-strain weakens this effect. Additionally, pre-strain can control the precipitation strengthening, dislocation strengthening, and grain boundary strengthening of high-entropy alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Xiaofeng Fan, Rui Li, Xingshuo Liu, Qingqi Liu, Xue Tong, Aoxiang Li, Shu Xu, Hao Yang, Pengfei Yu, Gong Li
Summary: This study presents the design of a novel non-equiatomic medium-entropy alloy with heterogeneous grain structures and dual-morphology nano-precipitates. The material exhibits high yield strength and ductility, mainly attributed to precipitation strengthening and hetero-deformation induced strengthening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Ao Meng, Fei Liang, Qingzhong Mao, Yong Fan, Yan Lin, Xiang Chen, Yonghao Zhao
Summary: This study presents an experimental investigation into the tribological behavior of CoFeNi2 medium entropy alloy (MEA) at different temperatures. The coefficient of friction (COF) increases as the temperature rises, while the specific wear rate initially increases but then decreases within the temperature range of 400 to 600 degrees C. The formation of a flat protective layer, coupled with ultrafine grains in the subsurface layer, contributes to the minimum COF at 400 degrees C. At higher temperatures, the synergistic effect of oxidation and stress/strain leads to the thickening of the protective tribo-layer and the emergence of a gradient structure in the dynamic recrystallization layer, thereby reducing the wear rate at 800 degrees C.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Hongkai Zhang, Yan Li, Tengfei Ma, Tianxing Chang, Peng Zhang, Xuewei Fang, Ke Huang
Summary: This study investigates the tensile properties of GH4720Li nickel-based superalloy samples with bimodal and trimodal gamma' precipitates distributions. The characteristics of the precipitates were quantified and the deformation microstructures were examined. The results show that tertiary gamma' contributes significantly to the strength of the alloy, while the contribution of secondary y' depends on particle size and competition between different shear mechanisms. The correlations between yield strength, deformation mechanism, and particle size are discussed, providing insights for the strength optimization of multimodal-particle-containing alloys.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Shengguo Ma, Yanjie Li, Shuo Li, Bin Xu, Tuanwei Zhang, Zhiming Jiao, Dan Zhao, Zhihua Wang
Summary: Introducing a gradient-structured Al0.1CoCrFeNi high-entropy alloy through simple torsional methodology achieves a good combination of strength and ductility. The synergistic strengthening effect from GS yields a unique up-turn behavior in strain-hardening-rate response, with nanoindentation hardness measurements and theoretical predictions further confirming this feature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Xiaodi Wang, Zhe Zhang, Zhengbin Wang, Xuechong Ren
Summary: In this study, the microstructures and tensile properties of Al0.3CoCrFeNi high-entropy alloys were adjusted through cold rolling and subsequent annealing treatment. The findings show that the different annealing states resulted in different grain structures and precipitates, which significantly influenced the strength and ductility of the alloy. These results provide guidance for designing high-entropy alloys with good strength and ductility.
Article
Materials Science, Multidisciplinary
Sumit Bahl, Lianghua Xiong, Lawrence F. Allard, Richard A. Michi, Jonathan D. Poplawsky, Andrew Chihpin Chuang, Dileep Singh, Thomas R. Watkins, Dongwon Shin, J. Allen Haynes, Amit Shyam
Summary: An Al-Cu alloy micro-alloyed with Mn and Zr (ACMZ) was studied to understand the thermal stability and strengthening mechanism of metastable theta'-Al2Cu precipitates with interfacial segregation. It was found that the theta' precipitates did not exhibit measurable coarsening after thermal exposure at 300 degrees C for 5000 h, likely due to the kinetic effects of Mn and Zr interfacial segregation dominating over thermodynamic effects.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Shuzhi Zhang, Zhiyuan Jia, Guangxu Zhao, Jing Zhang, Jianchao Han, Changjiang Zhang, Fantao Kong
Summary: High entropy alloys are ideal structural materials with excellent mechanical properties. A novel L12 precipitation strengthened medium entropy alloy is designed, which exhibits a yield strength of 1.09 GPa, an ultimate tensile strength of 1.5 GPa, and nearly 20% elongation at room temperature. However, the fully recrystallized as-aged alloy has poor plasticity at high temperature, while the non-recrystallized alloy directly aged after rolling shows excellent high temperature mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Aliakbar Emdadi, Yitong Yang, Sebastian Bolz, Oleg Stryzhyboroda, Michael Tovar, Sergej Gein, Ulrike Hecht, Sabine Wei
Summary: A necklace structure composed of fine grains formed by dynamic recrystallization was observed at the pre-existing grain boundaries during the hot compression of a BCC Fe-25Al-1.5Ta alloy containing C14 - (Fe, Al)2Ta Laves phase precipitates. Two possible mechanisms for necklace formation were proposed depending on whether the original grain boundaries are occupied by C14 particles or not. Recrystallization occurred preferentially around the clusters of large particles at the boundaries containing particles, while strain-induced boundary migration and bulging of the original grain boundaries were observed at the particle-free boundaries, serving as a preliminary stage for necklace formation. The necklace structure evolved and subgrain boundaries transformed into grains with increasing deformation strain.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Hyeonseok Kwon, Peyman Asghari-Rad, Jeong Min Park, Praveen Sathiyamoorthi, Jae Wung Bae, Jongun Moon, Alireza Zargaran, Yeon Taek Choi, Sujung Son, Hyoung Seop Kim
Summary: A strategy to improve the tensile properties of Co17.5Cr12.5Fe55Ni10Mo5 medium-entropy alloy through high-pressure torsion and subsequent annealing was presented. The combination of grain refinement and precipitation contributed to excellent strength, while post-HPT annealing provided substantial ductility, resulting in a yield strength of 1 GPa with over 15% uniform elongation.
Article
Chemistry, Physical
Rui Li, Yimo Ma, Xingshuo Liu, Ye Lu, Yifei Zhang, Pengfei Yu, Gong Li
Summary: In this study, the effect of defects on phase transition in high-entropy alloys was investigated by comparing the structure evolutions of ball-milled and as-cast samples. The ball-milled alloy exhibited a lower phase-transition-pressure and a higher fraction of hcp phase due to a higher density of defects and a lower nucleation energy barrier compared to the as-cast alloy. The findings suggest a potential approach for customizing the percentage of different phases in high-entropy alloys to improve their structure and characteristics as a novel engineering material.
Article
Materials Science, Multidisciplinary
Wei Zhao, Jiacheng Yu, Mindong Hu, Honglei Hu, Junting Luo, Gong Li
Summary: The crystallization toughening effect of Fe-based amorphous alloys under strain-heat coupling was investigated. The results showed that the alloys subjected to strain-heat coupling had a greater toughening effect due to changes in the morphology of the precipitated crystal phase and the introduction of free volume through plastic deformation, promoting the proliferation of shear bands. Excessive plastic deformation, however, resulted in direct fracture of the materials.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
X. S. Liu, R. Lia, X. F. Fan, Q. Q. Liu, X. Tong, A. X. Lia, S. Xu, H. Yang, S. B. Yu, M. H. Jiang, C. Huo, P. F. Yu, M. T. Dove, G. Li
Summary: In this study, dual-morphology B2 precipitates were obtained by thermo-mechanical processing in Co36Cr15Fe18Ni18Al8Ti4Mo1 MPEA. The dual-morphology B2 precipitates were found to enhance the yield strength and ultimate tensile strength significantly, suggesting the potential for optimizing the mechanical properties of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
A. X. Li, P. F. Yu, Y. P. Gao, M. T. Dove, Gong Li
Summary: We describe the development of a non-equiatomic CoCrFeNi2Al0.3Ti0.25 high entropy alloy (HEA) with high-density nano-lamellar precipitates and ultrafine grain structure. The HEA annealing at 700 degrees C (CR-700) exhibits ultra-high yield strength, ultimate tensile stress, and excellent total elongation, overcoming the strength-ductility trade-off. The ultra-high strength is mainly attributed to the synergistic strengthening effects of both nano-lamellar precipitates and ultrafine grains.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Huan Zhang, Yaqi Zhang, Chen Chen, Pengfei Yu, Li-Min Wang, Gong Li
Summary: A novel high-conductivity Agx[(Ga2Te3)34(SnTe)66]100-x tellurium-based glassy system was fabricated and showed potential for thermoelectric applications. The fabricated Ag10[(Ga2Te3)34(SnTe)66]90 glass exhibited higher room-temperature conductivity, larger glass transition temperature, and ultralower thermal conductivity compared to previously reported glassy systems. This distinctive Ag-Ga2Te3-SnTe system can be further investigated in similar glassy semiconductors and also has potential applications in other fields.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Shu Xu, Xingshuo Liu, Rui Li, Xiaofeng Fan, Qingqi Liu, Aoxiang Li, Pengfei Yu, Yongyong Wang, Gong Li
Summary: Fe3Cr2CoNiAlx (x = 0.6, 0.7, 0.8, 1.0, 1.1, 1.2) high entropy alloys (HEAs) with dual-scales B2 precipitated were prepared. The microstructure changed from face-centered-cubic (FCC) and body-centered-cubic (BCC) to a single BCC structure with the increasing of Al content. By controlling the concentration of Al element in the BCC-based HEAs, the structure can be tuned to two coherent BCC phases: medium B2 (m-B2) precipitates with an average length of 200-300 nm and smaller size B2 (s-B2) precipitates with an average diameter of 10-50 nm. The Fe3Cr2CoNiAl1.2 HEA exhibited excellent compression properties, with yield strength and fracture strain of 1464 MPa and 20%, respectively. The main strengthening mechanism was determined to be precipitation strengthening. This work provides a useful mean by tailoring multi-scale phase to achieve excellent properties in BCC-based high entropy alloys.
Article
Materials Science, Multidisciplinary
Xueming Wei, Lijun Zhang, Chunzhi Zhang, Gong Li
Summary: Although most BCC-based high-entropy alloys have high strength and excellent high temperature mechanical properties, their low plasticity greatly limits their application. In this study, a new BCC/B2 AlCrFeMnNi2 high-entropy alloy with a unique sunflower-like eutectic microstructure was prepared. This alloy exhibited high yield strength, fracture strength, and compressive plastic strain, surpassing many other BCC/B2 high-entropy alloys. The excellent mechanical properties are attributed to its unique microstructure consisting of coherent interface and bimodal distribution of precipitates. Our results provide a meaningful reference for improving the plasticity of BCC-based high-entropy alloys.
Article
Materials Science, Multidisciplinary
Huan Zhang, Yaqi Zhang, Gong Li
Summary: In this study, new tellurium-based amorphous alloys [(Ga2Te3)(34)(SnTe)(66)](100-x)-Sn-x were prepared and the glass-forming region was determined to be x = 0 to 10 mol%. The increasing Sn content led to a decrease in the glass transition temperature T-g and crystallization onset temperature T-c, resulting in a decrease in the stability criterion Delta T. The crystallization kinetics were investigated using DSC, and the activation energies of the amorphous sample were determined. The crystalline products were identified and showed potential for high-performance thermoelectric glass-ceramic materials.
Article
Materials Science, Multidisciplinary
Huan Zhang, Yaqi Zhang, Pengfei Yu, Li-Min Wang, Gong Li
Summary: This paper comprehensively investigates the microstructure evolutions and crystallization kinetics of Agx-[(Ga2Te3)(34)(SnTe)(66)](100-x) (x = 6, 8 and 10%) telluride glasses under non-isothermal conditions. The XRD, TEM, and SAED techniques were used to analyze the microscopic structure. The crystalline products were identified as the SnTe phase and Ga6SnTe10 phase. The crystallization process consisted of two overlapped peaks, corresponding to the precipitation of SnTe and Ga6SnTe10. The activation energy for crystallization events decreased with increasing Ag content.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Physics, Applied
R. Li, P. F. Yu, H. Yang, M. H. Jiang, S. B. Yu, C. Huo, X. S. Liu, G. Li
Summary: Pressure-driven phase transition in metals is an effective means to induce fresh phase and tune material properties, and the CoNiFe, CoNiCr, and CoNiV multi-principal element alloys were investigated in this study. The pressure-induced phase transition from face-centered cubic to hexagonal close-packed phase was observed at different pressures for each alloy. The increase in lattice distortion degree was found to decrease the initial phase-transition-pressure, and the probability of stacking fault formation increased in the order of CoNiFe, CoNiCr, and CoNiV alloys.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Hao Yang, Xingshuo Liu, Aoxiang Li, Rui Li, Shu Xu, Mengdi Zhang, Pengfei Yu, Subo Yu, Minghui Jiang, Chao Huo, Gong Li
Summary: The effect of Si content on the microstructure evolution and corrosion properties of Al0.2CoCrFe1.5NiSix (x = 0, 0.1, 0.2, 0.3) high entropy alloys (HEAs) was systematically investigated. The addition of Si element led to a change in microstructure from single face-centered cubic (FCC) phase to a dual-phase structure composed of FCC and body-centered cubic (BCC) phases. The corrosion resistance of the alloys was affected by the Si content, with the Al0.2CoCrFe1.5NiSi0.1 HEA exhibiting the best corrosion resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Xinliang Shi, Gong Li, Mengdi Zhang, Hanqing Xu, Ziyang Li
Summary: A novel Co-free non-equiatomic Cr-Fe-Ni-Nb eutectic high entropy alloys (EHEAs) with lamellar microstructure showed superior corrosion resistance in 3.5 wt% NaCl solution. The increase of Nb content resulted in higher volume fraction of Laves phase and smaller interlayer distance, leading to improved corrosion resistance. The Co-free EHEAs displayed a wide passive region, low corrosion current density, and excellent repassivation ability compared to established anticorrosion alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
R. Li, X. S. Liu, A. X. Li, P. F. Yu, C. S. Feng, S. Nan, M. Xiao, Z. Guan, C. Huo, S. B. Yu, M. H. Jiang, F. X. Zhang, G. Li
Summary: This study systematically compared the microstructural and mechanical properties of samples aged under high-pressure and ambient-pressure conditions. The results showed that the high-pressure samples had a higher volume fraction of discontinuous precipitates and achieved grain refinement through high-pressure treatment. The study provides important guidance for optimizing nano-precipitates through pressure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
G. J. Zhang, Q. G. Zhang, X. G. Wang, M. Sun, J. F. Yang, T. Hao, G. Li, H. Wang, J. G. Liu, Q. F. Fang, X. P. Wang
Summary: In this study, a newly developed equal channel angular pressing (ECAP) route BC-UD2 was used to extrude Fe9Cr1.5W0.7Si ferrite/martensitic steel, and the effect of microstructural evolution on the internal friction (IF) behavior was systematically investigated. The microstructural characterization revealed a transformation from an initial ferrite/martensitic structure to a fine laminar structure with a roughly 45 degree inclination to the extrusion direction (ED), accompanied by the evolution of texture. The dissolution of M23C6 and MX phases after extrusion led to a decrease in the Zener-Smith dragging force. The correlation between microstructure characterization results and IF behavior demonstrated the accuracy and reliability of the IF technique for studying the recrystallization behavior of structural materials in nuclear reactors.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Astronomy & Astrophysics
MingHui Jiang, SuBo Yu, BenCong Lai, FuXiang Zhang, Dong Ma, T. Martin Dove, Gong Li
Summary: Crystallography only provides information about the average atomic structure of a crystal, while the combined scattering method and Reverse Monte Carlo (RMC) simulation have the unique advantage of providing multiple information about a crystal, including the average atomic structure, atomic spacing, bond angles, orientation, and deformation of the structural polyhedron at the local scale. Recently, the RMC method has seen rapid experimental and theoretical development with the help of third-generation synchrotron and spallation neutron sources. Additionally, the RMC method is widely used to study the local fluctuations and fine structure of disordered materials.
SCIENTIA SINICA-PHYSICA MECHANICA & ASTRONOMICA
(2023)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
