Article
Materials Science, Multidisciplinary
Lanping Huang, Minghong Long, Wensheng Liu, Song Li
Summary: This study investigated the phase constitution, mechanical properties, and hydrogen desorption behaviors of high entropy alloys (HEAs) with different Cr content. The addition of Cr can strengthen the HEAs but reduce their ductility. The thermal stability and hydrogen desorption capacity decrease with increasing Cr content.
Article
Chemistry, Physical
Xiaohong Wang, Yulei Deng, Tengfei Ma, Qiaoyu Li, Duo Dong, Dongdong Zhu
Summary: Due to its nontoxicity and biocompatibility, the beta-type Ti35Zr25Ta15Nb15Sn10 biomedical high entropy alloy (BHEA) has been studied as an advanced biomedical material. However, the strength of the alloy needs improvement. Therefore, this study aimed to explore the feasibility of using ultrahigh-pressure methods to regulate the strength of the alloy.
Article
Chemistry, Physical
Jiaojiao Yi, Lin Yang, Mingqin Xu, Lu Wang, Lisha Liu, Long Zeng
Summary: In this study, the phase components, microstructures, and compressive properties of a novel 3D transition metal high entropy alloy CuFeNiTiV in the as-cast condition were investigated. The thermodynamic simulations revealed the order of phase separation during solidification, which was confirmed by XRD analysis of the alloy's phase components. The outstanding fracture strength of 2086 MPa in the as-cast alloy was attributed to the deformation resistance of both the major BCC phase and laves phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
X. J. Gao, L. Wang, N. N. Guo, L. S. Luo, G. M. Zhu, C. C. Shi, Y. Q. Su, J. J. Guo
Summary: This paper investigates the effects of Cr addition on the microstructure, phase constitutes, and mechanical properties of the Hf0.5Mo0.5NbTiZr refractory high-entropy alloy. The addition of Cr refines the dendritic structure, increases the strength, and influences the plasticity of the alloy. Homogenization treatment promotes the formation of Laves phase and significantly enhances the strength of the alloy.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
Shougang Duan, Qian Zhang, Wenxuan Li, Yong Dong, Beibei Jiang, Shichao Liu, Chuanqiang Li, Zhengrong Zhang
Summary: The effects of vanadium addition on the microstructural evolution and mechanical properties of AlCrFe2Ni2 high-entropy alloy were studied. The addition of vanadium inhibited the formation of FCC phase and resulted in a transition from FCC phase to BCC phase. Vanadium stabilized the BCC phase and B2 phase in the alloy, leading to increased hardness and yield strength.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Haofeng Lei, Xicong Ye, Jiaxing Feng, Junchao Chen, Zhongheng Diao, Dong Fang, Bo Li, Guangwei Zhao, Renci Liu
Summary: A series of low-cost CrFeNiBx (x = 0, 0.05, 0.1, 0.15, 0.2, 0.25, and 0.3) High Entropy Alloys (HEAs) without the Co element were investigated to study the effect of boron (B) content on the microstructure evolution, phase formation regulation, and compression properties. The results show that with the addition of B content, the microstructure of the alloys transforms and exhibits improved mechanical properties. This study is significant for the development of high entropy alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Li Bai, Yunzi Liu, Yangyang Guo, Yukun Lv, Tingting Guo, Jian Chen
Summary: The microstructure and mechanical properties of high-entropy alloys (Fe40Mn40Ni10Cr10)100-xAlx (x = 0, 5, 8, 10, 15, 20) were investigated. With increasing Al content, the phase structure of the alloys changed, resulting in increased strength but decreased ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Man-Ping Chang, Te-Hua Fang, Ting-Yu Zhu, Jau-Wen Lin
Summary: In this study, the mechanical properties and deformation mechanisms of CoCrFeNiMnx high entropy alloys (HEAs) were investigated through molecular dynamics (MD) simulation. Uniaxial tensile tests were conducted at different temperatures and manganese compositions, and a circular defect was created to study the damage tolerance of these HEAs. The results showed that the CoCrFeNiMn HEA exhibited a strong temperature dependence, with the ultimate tensile strength decreasing as the temperature increased. The early stage deformation was dominated by dislocation slip, while grain boundary glide played a major role in the later stage deformation. The higher manganese content led to the formation of hexagonal close-packed (HCP) and amorphous phases, which reduced the strength of CoCrFeNiMnx HEAs. Among the compositions tested, Mn5 HEA showed the best damage tolerance.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jifeng Zhang, Huan Qiu, Heguo Zhu, Zonghan Xie
Summary: The microstructure of AlxCoCr3Fe5Ni high entropy alloys changes with aluminum content, shifting from dendritic to lamellar eutectic structure, with a dual-phase structure of FCC and BCC phases found in all samples. As the aluminum content increases, the distortion of the crystalline lattice and strength of the alloy are enhanced, leading to an increase in ultimate tensile strength.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Shiyu Wu, Dongxu Qiao, Hongliang Zhao, Jun Wang, Yiping Lu
Summary: This study investigated the effect of Mo2C addition on the phase composition, microstructure evolution, and mechanical properties of NbTaW0.5(Mo2C) RHEAs. The results showed that the addition of Mo2C significantly improved the mechanical properties of the alloys, with NbTaW0.5(Mo2C)(0.2) RHEA reaching a yield strength exceeding 1000 MPa at 1473 K. The RHEAs exhibited good plasticity and promising application prospects.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Xin Lin, Mingliang Wang, Guangyu Ren, Dongxu Qiao, Yiping Lu, Tongmin Wang, Tingju Li
Summary: Eutectic high entropy alloys (EHEAs) with a novel system were investigated, featuring a bimodal eutectic microstructure. The fully eutectic composition exhibited the best mechanical properties in terms of compressive yield strength, fracture strength, and engineering strain.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Jiaojiao Yi, Lu Wang, Mingqin Xu, Lin Yang
Summary: Two 3d transition metal high-entropy alloys, AlCrCuFeX (X=Ti, V), were prepared by a vacuum arc-melting method and studied for their phase components, microstructures, and compressive properties. The alloy with X=V exhibited good synergy in strength and plasticity, with a high ultimate strength of 2138 MPa and a plastic strain of 7.1%, while the X=Ti alloy showed deteriorated strength and ductility due to a cleavage fracture mechanism caused by the Laves phase. The high hardness of the AlCrCuFeX alloys with X=Ti and V was significantly larger than that of the alloy with X=Ni.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Norhuda Hidayah Nordin, Leong Zhaoyuan, Russell Goodall, Iain Todd
Summary: Control over a lamellar-like-structured high entropy alloy system can be achieved by replacing aluminum with boron. The addition of boron influences the microstructure and phase formation, and the presence of Fe2B phase correlates with interfacial energy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Lijing Lin, Xin Xian, Zhihong Zhong, Kuijing Song, Chengyong Wang, Guoqiang Wang, Yucheng Wu, Peter K. Liaw
Summary: The dual-phase FeCoCrMn alloy with alternating lamellar FCC and sigma phases showed high compression yield strength and limited ductility. Improved thermal activation process and strength decline at elevated temperatures were responsible for the increased ductility and decreased yield strength. Comparison of yield strength with other high-entropy alloys was also made.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Shuyue Lv, Qinglin Li, Shuyan Zhang, Jiqiang Ma
Summary: In this study, the microstructural evolution and mechanical properties of Al0.25CrFeNi1.75Cux (x = 0-0.7) high entropy alloys were investigated. The microstructural analysis showed that high Cu doping changed the microstructure of the alloys, transitioning from a single FCC phase to a structure with FCC matrix and AlCu-type phase characteristics. The alloys exhibited dendritic morphology, with the average size of dendrites and secondary dendrite arm spacing significantly decreasing at high Cu content. Tensile tests revealed that increasing Cu concentration from 0 to 0.7 led to a 35.4% increase in yield strength and a 12.1% increase in ultimate tensile strength, but a decrease in elongation by 47.2%. These enhancements in mechanical properties were attributed to fine grain strengthening, second-phase hardening from AlCu-rich precipitation, and solid-solution strengthening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(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)