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(TiZrNbTa)-Mo high-entropy alloys: Dependence of microstructure and mechanical properties on Mo concentration and modeling of solid solution strengthening
Wang, SP; Xu, J; Xu, J (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
2018-04-01
发表期刊INTERMETALLICS
ISSN0966-9795
卷号95页码:59-72
摘要In this work, the evolution of microstructure and fundamental mechanical properties with Mo concentration in the arc-melted (TiZrNbTa)(100-x)Mo-x (0 <= x <= 20) high-entropy alloys (HEAs) are investigated. The arc-melted (TiZrNbTa)(100-x)Mo-x alloys structurally consist of two bcc phases. The change in volume fractions of two phases in the microstructure is insignificant with Mo concentration, at levels of similar to 75% for bcc1 and similar to 25% for bcc2. The increases in microhardness and Young's modulus of the alloys linearly scale with Mo concentration. To compromise the strength and ductility, the (TiZrNbTa)(90)Mo-10 exhibits an optimal combination of stiffness (E = 137 GPa), compressive yield strength (sigma(y) = 1370 MPa) and deformability (epsilon(p) approximate to 25%). In addition, it is indicated that dislocation widths in bcc lattice of refractory HEAs are insensitive to the alloying complexity, reflecting that the Peierls barrier is excluded as a predominant factor of strengthening. Furthermore, a simple model is proposed to reveal the solid solution hardening (SSH) in bcc refractory HEAs, in which the solid solutions are treated as an imposition of distortion-free and distorted lattices. By applying this model to archived refractory HEAs, the predicted yield strength agrees well with experimentally measured values. It provides a simple empirical tool used for predicting the strength of bcc refractory HEAs and to assist new alloy design.; In this work, the evolution of microstructure and fundamental mechanical properties with Mo concentration in the arc-melted (TiZrNbTa)(100-x)Mo-x (0 <= x <= 20) high-entropy alloys (HEAs) are investigated. The arc-melted (TiZrNbTa)(100-x)Mo-x alloys structurally consist of two bcc phases. The change in volume fractions of two phases in the microstructure is insignificant with Mo concentration, at levels of similar to 75% for bcc1 and similar to 25% for bcc2. The increases in microhardness and Young's modulus of the alloys linearly scale with Mo concentration. To compromise the strength and ductility, the (TiZrNbTa)(90)Mo-10 exhibits an optimal combination of stiffness (E = 137 GPa), compressive yield strength (sigma(y) = 1370 MPa) and deformability (epsilon(p) approximate to 25%). In addition, it is indicated that dislocation widths in bcc lattice of refractory HEAs are insensitive to the alloying complexity, reflecting that the Peierls barrier is excluded as a predominant factor of strengthening. Furthermore, a simple model is proposed to reveal the solid solution hardening (SSH) in bcc refractory HEAs, in which the solid solutions are treated as an imposition of distortion-free and distorted lattices. By applying this model to archived refractory HEAs, the predicted yield strength agrees well with experimentally measured values. It provides a simple empirical tool used for predicting the strength of bcc refractory HEAs and to assist new alloy design.
部门归属[wang, shao-ping ; xu, jian] chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, liaoning, peoples r china ; [wang, shao-ping] univ chinese acad sci, 19a yuquan rd, beijing 100049, peoples r china
关键词Tensile Properties Multicomponent Alloys Plastic-deformation Cubic Metals Biocompatibility Stability Crystals Implants
学科领域Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者National Natural Science Foundation of China [51571192]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/79393
专题中国科学院金属研究所
通讯作者Xu, J (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式
GB/T 7714
Wang, SP,Xu, J,Xu, J . (TiZrNbTa)-Mo high-entropy alloys: Dependence of microstructure and mechanical properties on Mo concentration and modeling of solid solution strengthening[J]. INTERMETALLICS,2018,95:59-72.
APA Wang, SP,Xu, J,&Xu, J .(2018).(TiZrNbTa)-Mo high-entropy alloys: Dependence of microstructure and mechanical properties on Mo concentration and modeling of solid solution strengthening.INTERMETALLICS,95,59-72.
MLA Wang, SP,et al."(TiZrNbTa)-Mo high-entropy alloys: Dependence of microstructure and mechanical properties on Mo concentration and modeling of solid solution strengthening".INTERMETALLICS 95(2018):59-72.
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