Article
Chemistry, Physical
Ziyi Cui, Shudong He, Jie Tang, Dingfa Fu, Jie Teng, Fulin Jiang
Summary: Grain size has a significant impact on the mechanical properties and deformation behavior of twinning-induced plasticity (TWIP) steels. Larger grain size promotes twinning, resulting in a noticeable TWIP effect and a suppression of dislocation proliferation. The combination of dislocation strengthening and twinning leads to a long plateau in the work-hardening rate curve, increasing the work-hardening ability. Uniform distribution of strain at grain boundaries and twin boundaries improves plasticity by relieving stress concentration.
Article
Engineering, Manufacturing
Chaolin Tan, Youxiang Chew, Fei Weng, Shang Sui, Zhenglin Du, Fern Lan Ng, Guijun Bi
Summary: This research explores the formation of high-fraction metal carbides in laser aided additive manufacturing high-strength steel through leveraging the intrinsic tempering effect. The as-built samples exhibit superior mechanical properties compared to traditional manufacturing methods, enabling excellent mechanical properties through subsequent heat treatments. The findings suggest a potential pathway for developing customized materials through fully understanding and utilizing the intrinsic tempering effect.
VIRTUAL AND PHYSICAL PROTOTYPING
(2021)
Article
Nanoscience & Nanotechnology
Marcos Natan da Silva Lima, Guilherme Luis Franca Schmalz, Rodrigo de Carvalho Paes Loureiro, Joao Carlos Ferreira, Samuel Filgueiras Rodrigues, Jessica Calvo Munoz, Jose Maria Cabrera Marrero, Hamilton Ferreira Gomes de Abreu
Summary: An experimental TWIP steel was deformed under hot torsion tests at different total equivalent strains. The effects of torsional deformation on the microstructure, texture, and mechanical properties were investigated. It was found that the main deformation mechanism changed from conventional sliding to nucleated twinning. The best balance between strength and ductility was achieved after a total equivalent strain of 2.6.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Yunrui Ma, Manling Dong, Jinfeng Geng, Weifeng Xin, Lingxiao Meng, Huajie Yang, Zhefeng Zhang
Summary: Researchers have been exploring efficient and energy-saving heat treatment methods. In this study, the microstructure and mechanical properties of 316L stainless steel were measured through electropulsing treatment and annealing treatment. The results showed that both treatments had significant effects on the grain structure and mechanical properties of the stainless steel.
Article
Materials Science, Multidisciplinary
N. Sommer, S. Lee, F. Stredak, C. Wolf, A. Suckau, M. Vollmer, S. Shao, T. Niendorf, N. Shamsaei, S. Boehm
Summary: The dynamic deformation behavior of metallic materials is crucial for crash-safe design in various applications. However, there has been limited research on the dynamic deformation properties in additive manufacturing. This study provides a comprehensive overview of the dynamic tensile deformation properties of AISI 316L stainless steel fabricated by laser-beam directed energy deposition. The study examines the interrelationships of process parameters, post-process heat treatments, and resulting microstructure. The findings show that the active deformation mechanisms and fracture elongations are influenced by heat treatment and microstructural effects.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Zhiguo Wang, Fei Gao, Shuai Tang, Chengang Li, Zhenyu Liu
Summary: A series of solution annealing experiments and quasi in-situ observation were conducted to investigate the grain growth behaviors in hot rolled 316H austenitic stainless steel with heterogeneous microstructure. It was found that during high temperature direct heating, grains grew unevenly with size differences, while stepping heating resulted in uniform grain growth and distribution, providing a new idea for regulating grain size in manufacturing heavy austenitic stainless steels.
Article
Nanoscience & Nanotechnology
Jiahua Yuan, Minghao Huang, Yizhuang Li, Lingyu Wang, Huabing Li, Wei Xu
Summary: Twinning-induced plasticity (TWIP)-assisted steel shows potential in engineering applications due to its strength and ductility. The dominant strengthening mechanism of TWIP-assisted steels is still unclear, with debate over the contributions of dislocations and deformation twinning. By preparing samples with different grain sizes, it was found that twinning-induced strengthening is grain size-dependent. Dislocation slip dominates plasticity in small grain sizes, while single-oriented twinning and multi-oriented twinning occur with increasing grain sizes. The strengthening effect is enhanced by the interaction between deformation twins and dislocations in multi-oriented twin variants.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Yuka Kajima, Atsushi Takaichi, Hein Linn Htata, Takao Hanawa, Noriyuki Wakabayashi
Summary: The influence of heat treatment time on the recrystallization process in Co-Cr-Mo alloys fabricated by selective laser melting (SLM) was evaluated. The results showed that when the heat treatment time was less than 45 minutes, the yield strength decreased and elongation increased. However, heat treatments longer than 60 minutes resulted in coarse grains and precipitates along the grain boundaries, which decreased the strength and ductility of the alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Mohammad Moallemi, Hojun Gwon, Hyung-Jun Cho, Sung-Joon Kim
Summary: This study presents new findings on the impact of strain-induced surface phase transformation on the alleviation of hydrogen embrittlement in an austenitic high Mn steel. The results obtained indicate that the strain-induced epsilon-martensite on the surface of the sample significantly reduces adsorbed hydrogen and elongation loss, which is attributed to the lower diffusivity of hydrogen in epsilon-martensite compared to austenite.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Liu Shuai, Ge Yinlei, Li Dongdong, Li Ziyue, Feng Yunli, Zhang Fucheng
Summary: This study investigates the effects of grain refinement on the tensile properties, dynamic strain aging (DSA), and twinning behavior of Fe-16Mn-0.6C steel. The results show that decreasing the grain size enhances the yield strength, tensile strength, and elongation of the steel. Grain refinement also increases the serration amplitude and local strain concentration of DSA, leading to a stronger DSA effect. Additionally, fine-grained steel exhibits delayed twinning behavior but continuously produces fine and dense twinning structures at high strains, contributing to the strain-hardening capacity and simultaneous increases in strength and ductility.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Lin Zhou, Suiyuan Chen, Mingzhi Ma, Jing Liang, Jialu Chen, Mei Wang
Summary: This study investigates the dynamic recrystallization behavior of non-contact ultrasonic-assisted direct laser deposited alloy steel. The results show that ultrasonic power has a significant influence on the grain size and tensile properties of the prepared alloy steel samples. The introduction of non-contact ultrasonic induces dislocation movement and triggers dynamic recrystallization. The optimized ultrasonic power achieves the best strength-plasticity matching relationship and improved strong-plastic product performance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
T. W. J. Kwok, T. P. McAuliffe, A. K. Ackerman, B. H. Savitzky, M. Danaie, C. Ophus, D. Dye
Summary: A TWIP steel with a specific composition was deformed to 6% strain and analyzed using 4D-STEM technique. It was found that the average elastic strain parallel and perpendicular to the twinning direction was about 6%, but there were hot spots with even larger strains up to 12%. These hot spots were attributed to a high density of Frank dislocations on the twin boundary. The strain fields in the TWIP steel were significantly larger than other twinning materials, and could explain the early thickness saturation of nanotwins.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Kun Wang, Chengyu Cai, Jixing Lin, Xian Tong, Zixiong Tao, Haicheng Yu, Qianfeng Fang, Yuewei Ye
Summary: In this research, a laser heat treatment was applied to a cold-rolled TWIP sample with different gage widths in three parallel regions. It was found that slower laser scanning speed resulted in larger molten pool, greater recrystallized grain size, and lower strength. By adjusting the laser scanning speed, each region could have a suitable microstructure, leading to a slight decrease in loading force but a significant improvement in plasticity. This introduces a new strategy called regional microstructure design (RMD), allowing a single material to have different microstructures instead of using multiple materials with different chemical compositions.
Article
Materials Science, Multidisciplinary
Hyo Moon Joo, Woo Chul Kim, Yong Joo Kim, Yeong Chul Jo, Mun Gu Kang, Ji Yong Lee, Min Soo Kim, Gi Bum Kim, Seong Jin Kim, Do Hyang Kim
Summary: The microstructure and mechanical properties of 20MnCr5 low alloy steel fabricated using Laser-based powder bed fusion have been investigated. The study found that laser power had a significant effect on the microstructure and mechanical properties of the steel. The microstructural characteristics influenced the steel's mechanical properties.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Anastasia V. Mikhaylovskaya, Olga A. Yakovtseva, Natalia Yu. Tabachkova, Terence G. Langdon
Summary: During superplastic deformation of microduplex-structured brasses, strain primarily occurs in the beta-phase through grain boundary sliding and dislocation slip/creep mechanisms. Dynamic recrystallization and twinning transform the initial coarse beta-phase grains into ultrafine grains, and alloying with Al improves superplastic behavior and reduces residual cavitation.
SCRIPTA MATERIALIA
(2022)
Article
Automation & Control Systems
Zhuoyuan Li, Jian Zhang, Yang Liu, Qingmao Zhang, Xizhang Chen, Shufeng Sun, Namrata Gangil, Arshad Noor Siddiquee
Summary: Laser surface quenching treatment can significantly improve the microstructure of steel and eliminate defects, and the laser energy density plays a key role in the dissolution of carbides, with higher energy density producing better results.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Thermodynamics
Pengyi Huang, Zongwang Chen, Jian Zhang, Mingge Wu, Yang Liu, Fengyun Zhang, Yifeng Chen, Xizhang Chen
Summary: This study prepared stainless steel bipolar plates with different flow field structures using the SLM technique and analyzed the effects of different flow field structures on the performance of PEMFC through polarization test and numerical simulation. The results showed that the square mesh flow field bipolar plate had better performance, including higher power density and more uniform gas and water distribution.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Multidisciplinary
Lei Huang, Xizhang Chen, Sergey Konovalov, Mi Wang, Chuanchu Su, Lei Han, Yanhu Wang
Summary: A mathematical model based on the response surface methodology (RSM) is developed to analyze the effects of key processing parameters on solidification cracks in aluminum alloys produced by cold metal transfer (CMT) welding. The model is shown to be reliable and capable of predicting the occurrence of cracks. Wire feeding speed and wire withdrawal are identified as the critical factors leading to solidification cracks. The optimization of processing parameters results in a visual parameter map that indicates the crack-free area for easier operation.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Chao Zhou, Youzhi Zhang, Jelena Stasic, Yu Liang, Xizhang Chen, Milan Trtica
Summary: High-entropy alloys (HEAs) have gained significant attention since their introduction in 2004. Machine learning (ML) is proposed as a tool to accelerate the research on new HEAs. Unlike the traditional melt-casting method, additive manufacturing (AM) has the potential for rapid prototyping and manufacturing of complex-shaped parts. The ML method proposed in this study takes into account the AM process parameters to predict the hardness of HEAs. Experimental results show that incorporating process parameters into ML improves the prediction accuracy by 4%, with an overall accuracy of 89% and an average prediction error of 3.83% for new HEAs.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Heyang Xin, Xizhang Chen, Yanhu Wang, Chuanchu Su, Dongqun Xin, Jiayi Xia, Yu Liang
Summary: In this study, the evolution of microstructure and mechanical properties of CoFeNiMnV high-entropy alloys (HEAs) fabricated by powder plasma arc additive manufacturing (PPA-AM) was investigated using a combination of cold rolling and annealing treatment. Cold rolling significantly refined the grain size and improved the hardness and strength of the alloy. Annealing treatment at different temperatures resulted in reduced dislocation density, dissolution of sigma phase, and coarsening of recrystallized grains and annealing twins. CoFeNiMnV HEAs annealed at 700 degrees C for 60 min after cold rolling exhibited an excellent high strength-toughness combination.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Nuclear Science & Technology
Milan Trtica, Jelena Stasic, Xizhang Chen, Jiri Limpouch, Petr Gavrilov, Andrijana Zekic
Summary: The behavior of ODS steel under high energy fluxes is significant as it is a promising material for fusion reactors. The addition of hafnium improves the microstructure and mechanical properties at high temperatures. This study investigated the effects of high-intensity -1015 W/cm2 radiation on Hf-containing ODS steel using ultrashort pulsed laser. Morphological and chemical analysis was conducted in different environments, revealing new data on damage parameters, threshold fluences, and chemical changes. The measured damage depths were -7.5 μm (air), -14 μm (helium), and -48 μm (vacuum), which were slightly lower compared to ODS steel without hafnium addition.
FUSION ENGINEERING AND DESIGN
(2023)
Article
Chemistry, Physical
Yangfan Wang, Zhiyang Wang, Arman Hobhaydar, Zhijun Qiu, Bosheng Dong, Qinfen Gu, Zengxi Pan, David Wexler, Hanliang Zhu, Xizhang Chen, Mingxing Zhang, Huijun Li
Summary: Novel low activation medium entropy alloys (MEAs) of FeCr2V and FeCr2VW0.1 were developed as potential nuclear structural materials. The materials were fabricated using arc melting and their microstructure and mechanical properties were investigated. The results show that the developed MEAs exhibited a dual-phase microstructure consisting of body-centered-cubic (BCC) phases. The addition of W significantly enhanced the solid solution strengthening (SSS) and precipitation strengthening (PS) in the studied alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Zefang Chen, Kang Peng, Xizhang Chen, Qichen Wang, Yu Liang
Summary: This study investigated the effect of ER2209 multi-stranded wire on the microstructure and pitting resistance of 2205 duplex stainless steel submerged arc welded joints, compared to single wire welding. The use of multi-stranded wire resulted in more metal deposition and doubled the welding efficiency, while increasing the concentration of Ni in the weld metal and the proportion of austenite in the heat-affected zone. Multi-stranded wire welding also promoted the diffusion of main alloying elements and improved the mechanical properties and pitting resistance of the welded joint.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Bang Shi, Dongqun Xin, Xizhang Chen, Yanhu Wang, Arvind Singh
Summary: In this study, a Cu28.36 Ni22.32 Fe19.12Co15.17Cr12.26Mo2.77 HEA with dual FCC phase was successfully prepared, which exhibited excellent plasticity, toughness, and mechanical properties, with lower production cost.
Article
Engineering, Manufacturing
Chuanchu Su, Yanhu Wang, Weimin Wu, Sergey Konovalov, Lei Huang, Xizhang Chen, Shuyang Qin
Summary: In this study, a new wire + powder synchronous arc additive manufacturing technique was used to fabricate Ti-Cu alloys. The microstructure and properties of the as-fabricated alloys were investigated. The results demonstrated that the prepared Ti-Cu alloys exhibited good properties. The presence of Cu with high growth restriction factor created a larger constitutional supercooling zone in the Ti-Cu alloys, which counteracted the detrimental effect of high thermal gradient during the manufacturing process. The as-printed Ti-Cu alloy specimens exhibited equiaxed fine-grained microstructure, as observed through microstructure analysis. Moreover, Cu also improved the compactness of the passivation film and enhanced the corrosion resistance of the alloy, as determined by corrosion performance analysis.
3D PRINTING AND ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Dongqun Xin, Xiucong Yao, Jian Zhang, Xizhang Chen
Summary: The study successfully fabricated thin-walled stainless steel 304 L/Inconel625 compositionally graded materials using an innovative twin-wire plasma arc additive manufacturing (TW-PAAM) process. Sharp changes in composition between 304 L and In625 resulted in significant variations in microstructural morphology and hardness, while gradual transition and crack formation were observed in the higher In625 content region. The study provides insights into optimizing the wire arc additive manufacturing process to avoid cracks and weakening of properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Mengyue Wang, Xizhang Chen, Fengze Dai, Kang Peng, Ramachandra Arvind Singh, Sergey Konovalov
Summary: In this paper, laser shock imprinting (LSI) is proposed to improve the fatigue performance of aero-engine blades. By using a contact film with micro-grooves, the surface morphology of the blades is transformed to enhance their fatigue performance. The study shows that by adjusting the process parameters, such as peak pressure and impact number, the residual stress and micro-plastic deformation of the blade surface can be controlled, leading to an improved surface morphology.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yifei Huang, Dongqun Xin, Xizhang Chen
Summary: In this study, a Ni49Ti51 shape memory alloy was successfully prepared using the double-wire arc additive manufacturing process. The microstructure of the alloy consists mainly of NiTi (B19 '), NiTi (B2), and NiTi2 phases. The alloy demonstrates significantly increased compressive strength and fracture strain compared to the plasma arc powder melting process, and exhibits a superior shape memory effect with a recovery rate of up to 88%.
Article
Optics
Lei Wu, Fengze Dai, Shu Huang, Xizhang Chen
Summary: Laser shock imprinting (LSI) was used to improve the fatigue performance of TC4 titanium alloy. The effects of shock wave pressure and contact foil thickness on surface topography and residual stress were studied through experiments and finite element modeling. Thicker contact foils were found to effectively mitigate the surface roughness and reduce residual stress difference. LSI is a promising technique for enhancing the fatigue performance of workpieces.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Engineering, Mechanical
Ming Feng, Yang Lei, Zhixiang Chen, Xianglei Zhang, Xizhang Chen, Youliang Wang
Summary: In this study, the feasibility and characteristics of polishing elliptical elements using a doughnut-shaped MCF polishing tool were investigated through experimental research. The results showed that the middle portion of the polishing tool had the best material removal ability, and different polishing slurries had varying effects on surface roughness and glossiness. Additionally, the working gap, revolution speed, and polishing time also influenced the polishing results. The microstructure of the MCF polishing tool after polishing revealed even distribution of abrasive particles grabbed by ferric clusters, with alpha-celluloses interleaved between the clusters.
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)