Effects of Si addition on mechanical properties and superelasticity of Ti-7.5Nb-4Mo-2Sn shape memory alloy

被引：7
作者：
Ding, D. [1 ]
Zhang, D. C. [1 ]
Luo, Z. C. [1 ]
Tan, C. G. [1 ]
Zhang, Y. [1 ]
Lin, J. G. [1 ]
机构：
[1] Xiangtan Univ, Minist Educ, Key Lab Low Dimens Mat & Applicat Technol, Fac Mat & Opt Elect Phys, Xiangtan 411105, Hunan, Peoples R China
来源：
MATERIALS & DESIGN | 2014年 / 61卷
关键词：
MARTENSITIC-TRANSFORMATION; BIOMEDICAL ALLOYS; TI; MICROSTRUCTURE; BEHAVIOR; COMPOSITES; DEFORMATION;
D O I：
10.1016/j.matdes.2014.04.043
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Effects of 0-2.1 at.% Si additions on microstructure and mechanical properties of a Ni-free biomedical superelastic beta-Ti alloy, Ti-7.5 at.%Nb-4 at.%Mo-2 at.% Sn (Ti-7.5Nb-4Mo-2Sn), were investigated. The alloys after annealing at 973 K mainly contain beta and alpha(n). As the concentration of Si is higher than 1 at.%, Ti5Si3 particles can be found in the alloys, and the number density of the particles increases with the increasing of silicon's concentration. The addition of Si promotes the strength of the Ti-7.5Nb-4Mo2Sn due to the Si solid solution strengthening effect and fine Ti5Si3 precipitates. However, as the Si concentration reaches 2.1%, the alloy exhibits a brittle fracture. The 0.5-1.6 at.% Si additions improve the superelasticity of the Ti-7.5Nb-4Mo-2Sn alloy by increasing the critical stress for inducing martensite (sigma(SIM)). (C) 2014 Elsevier Ltd. All rights reserved.
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收藏
页码：146 / 149
页数：4
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