Article
Materials Science, Multidisciplinary
Jyoti Ranjan Sahoo, Bhanu Pratap Singh, Sumeet Mishra
Summary: Finite element and digital image correlation assisted mechanical tests were conducted to assess the formability characteristics of a preaged Al-Mg-Si alloy. It was observed that an increase in preageing temperature led to a significant decrease in work hardening ability and strain rate sensitivity, which in turn had adverse effects on formability parameters such as uniform and non-uniform elongation.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Chong Yang, Guoguo Zhu, Bin Li, Yan Peng, Baodong Shi
Summary: The difference in mechanical behavior between fixed-end and free-end torsion is investigated in this study. The end constraint affects the strain hardening behavior, with fixed-end torsion dominated by prismatic slip and free-end torsion exhibiting two stages of strain hardening. The axial effect is sensitive to forward and reversal torsion, and the difference in axial stress under fixed-end torsion is attributed to twin growth.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
M. Ciemiorek, A. Ambroziak, K. Majchrowicz, M. Lewandowska, J. Golinski
Summary: The paper discusses the formability and ductility of ultrafine grained plates of commercial 5754 aluminium alloy under different strain rates and temperatures. A hybrid process combining multi-turn Equal Channel Angular Pressing and upset forging is proposed for the simple production of UFG sheets with high formability at elevated temperatures. Proper selection of temperature and strain rate can increase the elongations in tensile tests and the formability of UFG sheets.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yeonju Noh, Min-Su Lee, Umer Masood Chaudry, Tea-Sung Jun
Summary: This study investigates the mechanical properties and strain rate sensitivity of a commercial aluminum alloy at different temperatures. The results show that the alloy exhibits improved mechanical properties and a change in strain rate sensitivity at cryogenic temperatures. The study also analyzes the strengthening mechanisms and work-hardening behavior, and examines the dislocation structures using microscopy techniques.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Yanchun Zhu, Qinghua Wang, Zhiquan Huang, Ling Qin, Ziliang Li, Lifeng Ma
Summary: The flow curves of as-cast AZ31B magnesium alloy during high temperature deformation were obtained through a thermal compression test. The effects of deformation amount, grain size, strain rate, and deformation temperature on flow stress, strain rate sensitivity index, and strain hardening index were analyzed. The study has significant implications for guiding the selection of process parameters in the plastic processing of as-cast AZ31 magnesium alloy.
Article
Chemistry, Physical
S. S. Dash, D. J. Li, X. Q. Zeng, D. L. Chen
Summary: Aluminum alloy is widely used in the automotive industry for its lightweight and high-performance characteristics. This study focused on the microstructure and strain rate effects on the tensile deformation behavior of a high-pressure die-cast Silafont*-36 alloy, revealing unique heterogeneous microstructures and strain hardening behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Jingxuan Sun, Lei Zhang, Yufeng Huang, Baishan Chen, Jiatao Zhou, Wensheng Liu, Yunzhu Ma
Summary: The impact of the biphasic microstructure on the mechanical properties of the 90W-7Ni-3Fe alloy was investigated. The involvement of W particles during the initial strain was found to greatly affect the flow stress, strain hardening rate, and strain rate sensitivity.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Feifei Zhang, Kai He, Zheng Li, Bo Huang
Summary: This study systematically investigates the influence of strain rate on the anisotropic deformation behavior of high-strength aluminum alloy sheets, and provides basic experimental data for their application in engineering fields in the future.
Article
Materials Science, Multidisciplinary
Kai Yao, Xiaohua Min
Summary: This study systematically clarifies the instantaneous strain rate sensitivity (ISRS) and strain rate sensitivity of strain hardening (SRSS) in the {332} < 113 > Ti-15Mo alloy exhibiting TWIP effect. The results show that ISRS is positively correlated with the change in the dislocation activation volume, while SRSS is negatively correlated with the evolution of deformation microstructures.
Article
Metallurgy & Metallurgical Engineering
Danielle Cristina Camilo Magalhaes, Andrea Madeira Kliauga, Vitor Luiz Sordi
Summary: The tensile and fracture behaviors of AA6061 alloy at cryogenic temperatures were studied, revealing suppression of PLC and DSA effects at 77K compared to 173K and 298K. The alloy exhibited increased strength, uniform elongation, strain-hardening exponent, etc., at 77K due to reduced dynamic recovery rate.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Nanoscience & Nanotechnology
Deping Zhang, Dongdong Zhang, Yaqin Zhang, Shanrong Chen, Tao Xu, Jian Meng
Summary: The ductile Mg-Yb based alloy shows better strain hardening ability and formability at room temperature compared to high-formable Mg alloys. The alloy exhibits four strain hardening stages labeled as stage I, II, III, and IV, different from the majority of Mg alloys, with stage II characterized by an increased strain hardening rate rather than plateau or decrease.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Tangqing Cao, Qian Zhang, Liang Wang, Lu Wang, Yao Xiao, Jiahao Yao, Huaiyi Liu, Yang Ren, Jun Liang, Yunfei Xue, Xiaoyan Li
Summary: High-entropy alloys (HEAs) possess unique microstructures and chemical compositions, resulting in remarkable mechanical properties. In this study, the mechanical behaviors and deformation mechanisms of CoCrFeNi HEAs under dynamic loading were investigated through experiments and simulations. The results showed significant strain rate sensitivity and strain-hardening capability of CoCrFeNi HEAs at high strain rates. The findings shed light on the design and fabrication of HEAs with excellent dynamic mechanical properties.
Article
Nanoscience & Nanotechnology
Luiz Carneiro, Duke Culbertson, Qin Yu, Yanyao Jiang
Summary: The study experimentally characterized the mechanical response and microstructure evolution of a rolled AZ31B magnesium alloy using companion thin-walled tubular specimens under free-end monotonic torsion. It was found that the shear stress-shear strain response exhibits a sigmodal shape with four distinctive stages of strain hardening, involving basal slips, tension twinning, and compressing twinning. The formation of twin-twin boundaries (TTBs) and the collective hardening effects by twin boundary (TB) and TTB contribute to a unique rise in strain hardening rate in certain stages. Further observations of different types of twins and their interactions provide insights into the deformation mechanisms during different stages of the process.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
H. Wang, X. Sun, S. Kurukuri, M. J. Worswick, D. Y. Li, Y. H. Peng, P. D. Wu
Summary: Manufacturers have developed magnesium alloys with remarkable properties by adding rare-earth elements to overcome the limitation in formability at room temperature. The rare-earth magnesium alloys behave differently from conventional alloys, especially in terms of their anisotropic and strain rate sensitive behavior. This study investigates the behavior of a rare-earth Mg alloy ZEK100 sheet at room temperature using an elastic viscoplastic self-consistent polycrystal plasticity model. Different strain rate sensitivities are employed by the model to simulate the strain rate sensitive behaviors under different loading directions and rates. The study highlights the importance of using different strain rate sensitivities for each deformation mode in hexagonal close-packed metals.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Nanoscience & Nanotechnology
Jiansheng Li, Jian Zhou, Yanfang Liu, Kang Wei, Jianfeng Liu, Yichun Xi, Zhumin Li, Tong Liu, Wei Jiang
Summary: This study systematically investigated the mechanical properties and deformation mechanisms of AlCoCrFeNi2.1 eutectic high entropy alloy under medium strain rates. The alloy showed significant strain rate hardening and continuous strain hardening behavior, without the formation of adiabatic shear bands.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Xianna Meng, Datong Zhang, Weiwen Zhang, Cheng Qiu, Daolun Chen
Summary: This study improved the strength and damping capacity of high-Zn AlZn alloys through grain refinement and alloying, and achieved the preparation of fine-grained high-Zn AlZnMgCuZr alloys. The microstructure of the alloys included numerous second-phase particles, high-density nano-sized precipitates, high solute solubility, and many interfaces. These special structural features provided the alloys with excellent strength and damping capacity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
S. S. Dash, D. J. Li, X. Q. Zeng, D. Y. Li, D. L. Chen
Summary: In this study, the micro-deformation mechanisms in an Al-Si cast alloy under stepwise compressive loading were investigated using EBSD and slip trace analyses. The presence of heterogeneous microstructural features significantly influenced the slip trace characteristics. Four types of slip traces in primary α-Al grains were identified, revealing the nature of dislocation motion and the extent of deformation difficulty associated with grain orientations and eutectic Si particles. Crystallographic factors were analyzed to understand the deformation behavior of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
S. S. Dash, D. J. Li, X. Q. Zeng, D. Y. Li, D. L. Chen
Summary: The aim of this study is to investigate the monotonic and cyclic deformation behavior of a high-pressure die cast Silafont (R)-36 alloy in a naturally-aged T4 state. The T4 heat treatment led to significant microstructural changes, resulting in the transformation of coralloid-like eutectic Si particles to spheroidal Si particles embedded in the Al matrix. The T4 alloy exhibited strong cyclic hardening and a longer low cycle fatigue life compared to its as-cast state at lower strain amplitudes, attributed to particle-dislocation interactions during deformation. A strain energy density-based model incorporating microstructural aspects can be used to predict the fatigue life of the T4 alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Ceramics
C. C. Ye, H. Q. Ru, D. L. Chen
Summary: This study aimed to investigate the effects of sintering additives on the fatigue life of silicon nitride (Si3N4) ceramics sintered via hot pressing, focusing on the prominent toughening mechanisms. The fatigue life and probability of survival of YMH samples using MgO and Y2O3 as sintering additives were found to be higher than those of YAH samples using Al2O3 and Y2O3 as sintering additives. This was attributed to the higher aspect ratio of the elongated β-Si3N4 grains, larger compressive residual stresses, and the presence of only amorphous (or glassy) phase at β-Si3N4 grain boundaries in the YMH sample.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Aakash Kumar, Yunqing Tang, D. Y. Li, D. L. Chen, Wei Li, Q. Y. Li
Summary: Solid-solution hardening can improve the wear resistance of metals by pinning dislocations and affecting the atomic bond strength and Young's modulus. Cu was hardened by Ni and Mn, resulting in increased hardness and Young's modulus with Ni addition, and decreased Young's modulus but increased hardness with Mn addition. However, the effect of Ni and Mn on wear resistance is underestimated or overestimated by using the classic Archard equation, which can be corrected by a wearing energy model taking into account the influence of Young's modulus.
Article
Engineering, Mechanical
Y. Q. Tang, A. Kumar, D. L. Chen, D. Y. Li, Q. Y. Li, W. Li
Summary: The Bauschinger effect, which refers to the decrease in yield strength of a metal after plastic deformation in the opposite direction prior to testing, affects the wear resistance of materials under different conditions. This study investigated the influence of the Bauschinger effect on the wear resistance of strain-hardened Cu (FCC) and Mg (HCP) through experiments and molecular dynamics simulations. It was observed that strain-free Cu exhibited a stronger Bauschinger effect, while the situation was reversed for undeformed and deformed Mg samples. The underlying mechanisms were studied through molecular dynamics simulations, revealing that high-density dislocations weaken the Bauschinger effect in cold-worked Cu, while cold-worked Mg with fewer defects has more space for defect generation and cancellation, resulting in a stronger Bauschinger effect. Additionally, the Bauschinger effect was found at the oxide/metal interface, making the oxide scale on worn surfaces less prone to being scratched off during bi-directional sliding, thus enhancing the wear resistance of the metal.
Article
Materials Science, Multidisciplinary
Mingyu Wu, Guijiang Diao, Zhen Xu, Ruiken Sim, Wengang Chen, Daolun Chen, Dongyang Li
Summary: Microstructure, mechanical properties, wear resistance, corrosion and corrosive wear resistance of AlCrFeNiWx (x = 0, 0.1, 0.2, 0.3 and 0.4) medium-entropy alloys (MEAs) prepared by vacuum arc melting process were investigated. Tungsten addition in AlCrFeNi alloy significantly improves its hardness, strength, pitting resistance and passivation property, while excessive W addition reduces ductility. AlCrFeNiW0.3 shows the highest corrosion resistance and W enhances the wear and corrosive wear resistance in AlCrFeNiW0.4.
Review
Materials Science, Multidisciplinary
Soumya Sobhan Dash, Daolun Chen
Summary: This review focuses on recent developments in the processing, structure, and mechanical properties of structural Al-Si alloys, aiming to address pressing environmental issues and achieve lightweighting strategies. It summarizes advancements in casting methods and additive manufacturing processes, analyzes improvements in thermal stability, electrical conductivity, and mechanical strength, and discusses fatigue failure mechanisms and surface topography.
Review
Materials Science, Multidisciplinary
Dhruv Bajaj, Aihan Feng, Shoujiang Qu, Zhuo Chen, Dongyang Li, Daolun L. Chen
Summary: The 3D printing of high-entropy alloys (HEAs) offers greater flexibility in designing and manufacturing novel materials. These 3D-printed HEAs exhibit unique microstructures and mechanical properties, breaking the limitations of conventionally-manufactured materials. This review provides insight into the deformation behavior of 3D-printed HEAs, with emphasis on fatigue characteristics and the effects of postfabrication thermomechanical processing.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Automation & Control Systems
Soumya Sobhan Dash, Mudit Kesharwani, Abdulmohsen Albedah, Xianquan Jiang, Dongyang Li, Daolun Chen
Summary: The study aimed to investigate the feasibility of joining ZEK100-O magnesium alloy to AA7072-clad high-strength AA7075-T6 aluminum alloy using solid-state ultrasonic spot welding (USW). The interfacial microstructures, tensile lap shear strength, and fatigue resistance were evaluated. Mechanical interlocks and a diffusion layer were observed at the weld interface, resulting in enhanced tensile lap shear strength and fatigue life.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
H. Wang, D. T. Zhang, C. Qiu, W. W. Zhang, D. L. Chen
Summary: A low-alloyed Mg-1.2Zn-0.1Ca alloy was fabricated via low-temperature extrusion and annealing to attain heterostructures with different fine-grained fractions, showing significant effects on the mechanical properties. The alloy exhibited increased fine-grained fraction and fine grain size with annealing, resulting in superior mechanical properties of high yield strength and good ductility. Hetero-deformation induced strengthening plays a key role in achieving the superior mechanical properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
X. R. Guan, Q. Chen, S. J. Qu, G. J. Cao, H. Wang, A. H. Feng, D. L. Chen
Summary: Increasingly harsh service conditions require better high strain-rate performance of titanium alloys. Adiabatic shear band (ASB), which is prone to dynamic loading, often leads to catastrophic damage. However, the relationship between internal nanostructures and shear instability remains unclear.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
G. J. Diao, A. Q. He, Y. Q. Tang, M. Y. Wu, D. Zhang, W. G. Chen, D. L. Chen, D. Y. Lia
Summary: The individual effects of Al and Ti on microstructure, mechanical and tribological properties of CrFe2Ni2 alloy were investigated. Al addition changed the alloy phase from FCC to a mixture of FCC, A2 and B2 phases, increasing the mechanical strength while slightly sacrificing ductility. Ti caused the formation of hard phases in the alloy, increasing the wear resistance, but also decreasing the ductility. Detailed characterization is crucial for optimizing tribological applications of relevant HEAs.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
S. E. Mousavi, A. Q. He, M. Palimi, D. L. Chen, D. Y. Li
Summary: The individual influences of Al, Fe and Ni on the microstructure, wear resistance and mechanical properties of high-entropy alloys (AlxCrFeyNizTi0.2) were studied. It was found that increasing Al content led to the replacement of the FCC phase by disordered and ordered BCC phases, resulting in increased micro-hardness and decreased wear volume loss. Fe increased the fraction of A2 phase but reduced hardness and wear resistance. Ni helped form a FCC phase, which decreased hardness and increased wear volume loss. Among all specimens, AlCrFeNiTi0.2 and Al0.5CrNiTi0.2 showed the highest wear resistance.
Article
Materials Science, Multidisciplinary
Zhiying Liu, Lizhong Lang, S. M. A. K. Mohammed, Daolun Chen, Bei He, Yu Zou
Summary: Nanoindentation is widely used for measuring local mechanical properties of heterogeneous materials. In this study, a nanoindentation mapping method with small indentation depths (<200 nm) is used to investigate the nanohardness (H) of the alpha phase in an additively manufactured titanium alloy. The results reveal two groups of H values exhibited by alpha grains with different crystal orientations, in contrast to the wide range of H values measured by conventional large-depth nanoindentation. These two groups of H values are attributed to the contribution of elasticity in the measurement using small-depth nanoindentation. Additionally, the H values are correlated with the microscopic mechanical behavior of alpha grains, showing that hard alpha grains are deformed by shear banding while soft alpha grains are deformed by dislocation slip.
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)
