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Phase transition, microstructural evolution and mechanical properties of Ti-Nb-Fe alloys induced by Fe addition

被引：134
作者：
Ehtemam-Haghighi, Shima [1 ]
Liu, Yujing [1 ]
Cao, Guanghui [2 ]
Zhang, Lai-Chang [1 ]
机构：
[1] Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia
[2] Shanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Dept Mat Engn, 149 Yanchang Rd, Shanghai 200072, Peoples R China
来源：
MATERIALS & DESIGN | 2016年 / 97卷
关键词：
Titanium alloy; Phase transition; Microstructure; Mechanical property; Fracture; TITANIUM-ALLOYS; DEFORMATION-BEHAVIOR; PURE TITANIUM; HIGH-STRENGTH; ZR ALLOYS; BETA; COMPOSITES; ALPHA; AL; STABILITY;
D O I：
10.1016/j.matdes.2016.02.094
中图分类号：
T [工业技术];
学科分类号：
120111 [工业工程];
摘要：
Ti-11Nb-xFe (x = 0.5, 3.5, 6, 9 wt.%) alloys were designed and fabricated by cold crucible levitation melting to study the effects of Fe addition on their phase transition, microstructure and mechanical properties. Results show that phase and properties of the alloys depend on Fe additions. Ti-11Nb-0.5Fe alloy presents a typical alpha + beta biphasic Widmanstatten microstructure. Increasing Fe content to 3.5 wt.% enhances beta phase volume fraction. At 6 wt.% Fe, the resultant microstructure is changed to mainly beta with minor amount of a. phase. Finally, when Fe content is 9 wt.%, the alloy exhibits a single beta phase microstructure suggesting Fe addition is effective in suppressing a and a. formation, hence making beta more stable. Compressive yield strength and hardness of the alloys are 796-1137 MPa and 278-357 HV5 respectively. It is noteworthy that upon increasing Fe content, the elastic modulus of the alloys decreases, while their plastic strain and elastic energy are enhanced due to retention of more beta phase. The lowest elastic modulus (82 GPa) and highest plastic strain (38%) are observed in full beta Ti-11Nb-9Fe alloy. Moreover, Ti-11Nb-9Fe presents higher elastic energy (7.08 MJ/m(3)) than that of some commercial Ti-based biomaterials. The results suggest that Ti-11Nb-9Fe is a promising candidate for biomedical applications. (C) 2016 Elsevier Ltd. All rights reserved.
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页码：279 / 286
页数：8
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