Article
Materials Science, Multidisciplinary
T. Nakata, C. Xu, S. Kamado
Summary: After cold-rolling an Mg-6Zn-0.3Ca alloy sheet with a strong basal texture, anomalous double twinning occurred with the (0001) pole aligned to the transverse direction. These twins served as nucleation sites for statically recrystallized grains during annealing, resulting in weak texture features in the annealed sheet with transverse-direction split (0001) poles.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
G. S. Duan, Z. W. Guan, L. H. Song, Y. H. Chu, J. X. Zhou, X. H. Du, B. L. Wu, C. Esling
Summary: Due to the strain rate sensibility of magnesium alloys, the ratcheting behavior under cyclic loading was investigated and discussed at different frequencies. The results showed that the ratcheting strain and fatigue life exhibited two trends with frequency. In the frequency range of 0.02 Hz to 0.4 Hz, the ratcheting strain decreased and the fatigue life increased. In contrast, in the frequency range of 0.4 Hz to 2.0 Hz, the ratcheting strain increased and the fatigue life decreased. The frequency effect depended on the weight of the slip and twinning deformation mechanisms, which were related to strain rate, showing dual frequency domain characteristics.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Mozhgan Shokri, Abbas Zarei-Hanzaki, Hamid Reza Abedi, Jae Hyung Cho
Summary: The study investigated the correlation between microstructure/texture evolutions and high temperature flow behavior in Mg alloy containing long period stacking order (LPSO) phases. The annealing treatment effectively strengthened the alloy and decreased ductility, with blocky LPSO assisting dynamic recrystallization and lamellar LPSO increasing alloy strength. The findings suggest that microstructure and texture evolution play a significant role in the high-temperature behavior of the Mg alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Jan Dittrich, Gergely Farkas, Daria Drozdenko, Michal Knapek, Kristian Mathis, Peter Minarik
Summary: A combination of advanced in-situ experimental techniques, including neutron diffraction, acoustic emission, and electron backscattered diffraction, was used to investigate the deformation behavior of magnesium alloys. The potential and limitations of these techniques were demonstrated in a study on the influence of crystallographic texture on deformation mechanisms in a hot-rolled sheet of the AZ31 alloy. The results showed the twinning activity and its evolution, as well as the deformed microstructure, providing valuable insights into the deformation mechanisms of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Gukin Han, Yeonju Noh, Umer Masood Chaudry, Sung Hyuk Park, Kotiba Hamad, Tea-Sung Jun
Summary: The study found that Mg-0.5Ca alloy exhibits temperature-insensitive hardening behavior, while pronounced twinning activity was observed in pure Mg when deformed at low temperatures. The microstructure of Mg-0.5Ca helps reduce twinning behavior, resulting in its hardening behavior being temperature-dependent.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Iniobong P. Etim, Wen Zhang, Yi Zhang, Lili Tan, Ke Yang
Summary: Compressive stress has a greater impact on the corrosion rate of Mg-2Zn-0.5Nd alloy compared to tensile stress, due to the introduction of dislocation slip and deformation twins which accelerate corrosion rate. Tension twinning and prismatic slip occur during tensile deformation, while basal slip and tension twinning occur during compressive deformation. Twinning activity increases with plastic strain, correlating with degradation rate.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Z. Aalipour, A. Zarei-Hanzaki, A. Moshiri, H. R. Abedi, Daudi Waryoba, A. Kisko, L. P. Karjalainen
Summary: The microstructure and microtexture changes of an extruded and annealed magnesium alloy were investigated under different strain and processing conditions. The results showed that the material underwent noticeable refinement even at low applied compressive strain. Recrystallization process was completed at a true strain of 0.3, and grain refinement was attributed to the LSN and CDRX mechanisms. At higher strain levels, most grains were found in deformed states and the microtexture only changed in terms of intensity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Anjali Kanchi, Koteswararao Rajulapati, B. Srinivasa Rao, D. Sivaprahasam, Ravi C. Gundakaram
Summary: In this study, a refractory high-entropy alloy of the composition MoNbTaW was successfully synthesized and exhibited higher hardness after thermomechanical processing and homogenization. The dominant strengthening mechanism was predicted to be solid solution strengthening.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Nicolo M. Della Ventura, Szilvia Kalacska, Daniele Casari, Thomas E. J. Edwards, Amit Sharma, Johann Michler, Roland Loge, Xavier Maeder
Summary: The study of extension twinning mechanism in magnesium at the micron scale revealed that basal slip triggers {10(1) over bar2} twin nucleation and favors twin growth, while pyramidal slip leads to limited {10(1) over bar2} twin growth. The critical resolved shear stress for {10(1) over bar2} twinning was found to be ten times higher than in bulk material, indicating higher ductility in the tested samples.
MATERIALS & DESIGN
(2021)
Article
Metallurgy & Metallurgical Engineering
Filip Siska, Daria Drozdenko, Kristian Mathis, Jan Cizek, Tingting Guo, Matthew Barnett
Summary: The present study focuses on analyzing the stress and strain distribution inside and around the {10-12} twin in magnesium alloy. A 3D crystal plasticity model is used to represent the twin as an ellipsoidal inclusion surrounded by the matrix. The simulation results are consistent with experimental observations, showing a similar distribution of shear stress and activity of slip systems. Plasticity inside the twin is primarily caused by prismatic dislocation slip and does not affect twin back stress. The lateral propagation of the twin is influenced by prismatic and pyramidal slip in the twin vicinity, and the thickness of the twin is limited by the critical resolved shear stress values for dislocation slip, with basal slip playing a significant role.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Nanoscience & Nanotechnology
Jun Wang, Mahmoud Reza Ghandehari Ferdowsi, Peter A. Lynch, Sitarama R. Kada, Matthew R. Barnett
Summary: This study investigates the effects of age hardening on different types of twinning in magnesium alloys, specifically in alloy Mg-6.5Zn with bimodal textures. It was found that tensile twinning is stimulated by precipitates while compression twinning is suppressed by them. This difference is attributed to lower twin surface energy and a larger twinning dislocation Burgers vector in compression twins.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Zhe Liu, Fan Wu, Bo Feng, Li Liu, Chunlin Dong, Yunqiang Zhao, Bo Song
Summary: The friction stir welded AZ31 joint was processed with a two-step post-weld deformation, resulting in improved microstructure, texture, and mechanical properties. The presence of extension twins after the first-step cold compression greatly influenced the dynamic recrystallization process during the second-step hot compression. As a result, the grain orientations and their convergence on the weld side were effectively altered, leading to a significant enhancement in joint performance. Compared to the original joint, the yield strength, ultimate tensile strength, and elongation were improved by 64.7%, 20.8%, and 52.5%, respectively. The underlying strengthening mechanism was discussed through a comprehensive analysis of Schmid factor and geometric compatibility factor.
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
(2023)
Review
Materials Science, Multidisciplinary
Hamed Mirzadeh
Summary: This monograph provides an overview of friction stir processing (FSP) of surface metal-matrix composites (MMCs) using AZ91 magnesium alloy, summarizing the results related to various reinforcing particles and explaining the AZ91 composite fabricating methods based on FSP. The effects of introducing second-phase particles and FSP process parameters on the microstructural modification, mechanical properties, wear/tribological behavior, and corrosion resistance are discussed. Furthermore, suggestions for future work, such as focusing on superplasticity, metal additive manufacturing processes, and common reinforcing phases, are proposed.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Amir Hassan Zahiri, Luiz Carneiro, Jamie Ombogo, Pranay Chakraborty, Lei Cao
Summary: The study investigates the structure and formation mechanism of {11 (2) over bar2} twin-twin boundaries in Mg, revealing alignment with {11 (2) over bar2} or {11 (2) over bar6} planes. These boundaries significantly contribute to the understanding of twinning theories in Mg.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Roopam Jain, Mirtunjay Kumar, Krishanu Biswas, N. P. Gurao
Summary: The deformation behavior of a transformative Fe50Mn30Co10Cr10 complex concentrated alloy doped with 0.2 wt% silicon was studied using experimental analysis and simulations. It was found that the addition of silicon suppresses the martensitic transformation and instead leads to the formation of nano twinning during tensile deformation. The improved strength and ductility of the alloy can be attributed to solid solution strengthening and deformation twinning, respectively. Simulations also revealed the planar nature of slip and the impact of neighboring grain orientations on the rotation path of individual grains. Deformation nano twinning was identified as a critical factor contributing to significant ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Chengcheng Zhang, Kai Feng, Hiroyuki Kokawa, Bolun Han, Zhuguo Li
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Metallurgy & Metallurgical Engineering
Tianbo Zhao, Yutaka S. Sato, Hiroyuki Kokawa, Kazuhiro Ito
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2020)
Article
Materials Science, Multidisciplinary
Sergey Mironov, Yutaka S. Sato, Hiroyuki Kokawa, Satoshi Hirano, Adam L. Pilchak, Sheldon Lee Semiatin
Article
Materials Science, Multidisciplinary
Shun Tokita, Hiroyuki Kokawa, Shohei Kodama, Yutaka S. Sato, Yuji Sano, Zhuguo Li, Kai Feng, Yixiong Wu
MATERIALS TODAY COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Hiroki S. Furuya, Sakiko Yabu, Yutaka S. Sato, Hiroyuki Kokawa
Summary: The study found that adding Ni effectively increased the interfacial strength of Al/Cu joints. Regardless of the presence of Ni, the joints fractured at the thick Al2Cu layer formed at the Al/Cu interface. However, adding Ni reduced the thickness of the IMC layer and formed Al7Cu4Ni particles in the weakest Al2Cu layer, contributing to the increase in joint strength.
Article
Nanoscience & Nanotechnology
Bolun Han, Chengcheng Zhang, Kai Feng, Zhuguo Li, Xiancheng Zhang, Yao Shen, Xiaodong Wang, Hiroyuki Kokawa, Ruifeng Li, Zhiyuan Wang, Paul K. Chu
Summary: The study fabricated a near full-dense hierarchical CrCoNi medium entropy alloy (MEA) using selective laser melting (SLM), achieving superior yield strength at 77K. The high strength of the material stems from a hierarchical microstructure composed of high-density dislocations and low-angle grain boundaries (LAGB). The results suggest that SLM is a viable technique for fabricating dense hierarchical CrCoNi MEA and offer a design strategy to further improve mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Chengcheng Zhang, Kai Feng, Hiroyuki Kokawa, Zhuguo Li, Ke Chen
Summary: This work investigates the effects of friction stir processing (FSP) on the CoCrFeMnNi alloy fabricated via laser powder bed fusion (LPBF). The study focuses on the modification of surface microstructure and the investigation of grain structures, dislocation structures, texture, and dynamic recrystallization. The experimental results demonstrate that both continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) occur during FSP, leading to a refined grain size and a more uniform grain size distribution in the stir zone (SZ).
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Chengcheng Zhang, Kai Feng, Hiroyuki Kokawa, Zhuguo Li
Summary: The relationship between the hierarchical microstructure and mechanical properties of a CoCrFeMnNi high entropy alloy built by laser powder bed fusion (LPBF) was investigated. The study found that both the columnar grain morphology and texture play important roles in the anisotropy of mechanical properties. The volume-weighted average grain size showed high accuracy in estimating the yield strength and critical twinning stress along different directions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Xiaotong Pang, Zhihui Xiong, Shilong Liu, Junhao Sun, R. D. K. Misra, H. Kokawa, Zhuguo Li
Summary: Significant grain refinement of beta grains in metastable beta TB2 titanium alloy was achieved through the minor addition of zirconium diboride during laser melting deposition. The addition of 0.5 wt% ZrB2 resulted in smaller beta grains and improved mechanical properties, including higher ultimate tensile strength and ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Chengcheng Zhang, Kai Feng, Hiroyuki Kokawa, Zhuguo Li
Summary: The origin and evolution of cellular structures during LPBF were investigated using a CoCrFeMnNi high entropy alloy. Experimental results demonstrated that chemical cells with low dislocation density were generated simultaneously and overlapped with each other. The stability of the chemical cells contributes to the unique characteristics of cellular structures relative to conventional deformation-induced dislocation structures.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Jie Zhu, Chendong Shao, Fenggui Lu, Kai Feng, Pan Liu, ShuFen Chu, Yueqiao Feng, Hiroyuki Kokawa, Zhuguo Li
Summary: This work investigates the anisotropic ductility and deformation behavior of laser powder bed fusion (LPBF) processed Inconel 625 at elevated temperature. The rotation of grains plays a crucial role in the dynamic recrystallization-like flow stress fluctuation, while grain boundary embrittlement leads to the decrease in ductility.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Jie Zhu, Hiroyuki Kokawa, Kai Feng, Zhuguo Li
Summary: The intergranular corrosion resistance of Inconel 625 produced by laser powder bed fusion was investigated using ASTM-G28 method A. Severe corrosion near fusion boundaries was unexpectedly found. The initiation and expansion of corrosion along the fusion boundaries and the relationship between microstructure and corrosion behavior were analyzed. This unusual corrosion behavior was attributed to the Volta potential variation caused by Al2O3 nanoparticles and Mo, Nb-rich precipitates near the fusion boundaries. This finding can enhance the understanding of corrosion behavior in laser powder bed fused nickel alloys.
Article
Nanoscience & Nanotechnology
Jie Zhu, Jintao Xu, Hiroyuki Kokawa, Yakai Zhao, Kai Feng, Zhuguo Li, Upadrasta Ramamurty
Summary: This study demonstrates that periodic variation in layer thickness during laser powder bed fusion (LPBF) can alter the grain growth direction and effectively suppress the formation of columnar grains. This build strategy decreases both grain size and texture intensity, resulting in reduced anisotropy in mechanical properties. The variation in grain growth direction can be explained by the thermal gradient variation near the transition area after the alteration of layer thickness. This simple strategy provides an additional and new tool for grain structure tailoring during LPBF.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Metallurgy & Metallurgical Engineering
Yutaka S. Sato, Tomoko Miyamori, Shun Tokita, Hiroyuki Kokawa
Summary: This research examined the feasibility of using friction stir welding (FSW) to repair rusted steel structures in an underwater environment. The results showed that underwater FSW could produce high-quality welds on 0.45%C steel, with lower working temperatures and faster cooling rates compared to conventional FSW. This resulted in increased hardness and tensile strength of the welds. The rust layer had minimal impact on weldability, but fragmented rust trapped near the top surface of the weld zone at higher rotational speeds decreased the strength of the weld.
TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Yutaka S. Sato, Yuichiro Tanai, Dalong Yi, Tianbo Zhao, Hiroyuki Kokawa
Summary: The heat-input during Friction Stir Welding (FSW) of aluminum alloys was found to be influenced by the geometry of the welding tools, with a particularly strong dependence on probe dimensions. A linear relationship between heat-input and effective surface area of the tool was experimentally shown, suggesting a higher than expected impact of probe dimensions on heat-input. Furthermore, an empirical equation successfully estimated the heat-input during FSW based on welding parameters and tool geometry.
FRICTION STIR WELDING AND PROCESSING XI
(2021)
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)
