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phase-tunable equiatomic and non-equiatomic Ti-Zr-Nb-Tahigh-entropy alloys with ultrahigh strength for metallic biomaterials

引用

Journal of Materials Science & Technology 2022年第22期117卷 196-206页

作者： Tao Xiang Peng Du Zeyun Cai Kun Li Weizong Bao Xinxin Yang Guoqiang Xie School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The contradiction between the strength and ductility of metallic materials is a major scientific problemthat has been researched for a long time. Dual-phase equiatomic and non-equiatomic Ti-Zr-Nb-Ta highentropy alloys (HEAs) with super-high strength and excellent ductility have been successfully developedvia mechanical alloying (MA) combined with spark plasma sintering (SPS) technology. This is adjustedby altering the atomic ratios of the different phases. X-ray diffraction (XRD) and transmission electronmicroscopy (TEM) were performed to confirm the dual-phase microstructure. After the SPS process, theaverage grain size of the aforementioned equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs (134 ± 50 nm) evaluated byelectron back-scattering diffraction (EBSD) is smaller than that of the Ti-Zr-Nb-Ta HEAs (150 μm), whichwere fabricated using arc melting. According to the Hall-Petch formula, the grain boundary strengthening contribution in the Ti-Zr-Nb-Ta system is 33-fold higher than those fabricated using the arc-meltingprocess. When the alloy phase comprises the equivalent dual-phase, equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAshave good comprehensive performance compared to non-equiatomic Ti-Zr-Nb-Ta HEAs prepared usingthe same process. The yield strength of equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs (2212 ± 38 MPa) is two-foldhigher than that of Ti-Zr-Nb-Ta HEAs (1100 ± 90 MPa) fabricated via arc melting. This can be attributed tothe ultra-fine grain size. Notably, the equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs possess approximately the samebiocompatibility as commercial pure Ti (CP-Ti), indicating that the equiatomic Ti_(25)Zr_(25)Nb_(25)Ta_(25) HEAs areprovided with a possibility as an advanced biomaterial for the applications of the medical field.

关键词： Equiatomic Nb_(25)Ta_(25)Ti_(25)Zr_(25)HEAs Ultra-fine grain phase-tunable Mechanical properties Biocompatibility

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