Effect of Zr and Sn on Young's modulus and superelasticity of Ti-Nb-based alloys
Effect of Zr and Sn on Young's modulus and superelasticity of Ti-Nb-based alloys
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DOI：
10.1016/j.msea.2006.09.051
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发表时间：
2006-12-15
期刊：
影响因子：
6.4
通讯作者：
Yang, R.
中科院分区：
文献类型：
--
作者：
Hao, Y. L.;Li, S. J.;Yang, R.
研究了第四系Ti-(20-26)Nb-(2-8)Zr-(3.5-11.5)Sn （.wt%）合金，探讨了Zr和Sri对Ti-Nb基合金杨氏模量和超弹性的影响。x射线衍射分析表明，固溶处理合金具有β + α “、β + ω、α ” + ω、α "和β组织。Zr和Sn增加了β相的晶格参数；Zr和Sri的加入降低了α”马氏体的马氏体起始温度，而非热态w的形成则取决于Zr和Sn的含量。差示扫描量热法（DSC）测量结果表明，添加1wt %的Nb、Zr或Sn对马氏体晶格参数比（c/a和b/a）产生负作用，使马氏体起始温度分别降低了17.6、41.2和40.9 K。用拉伸试验评价了固溶处理合金的杨氏模量和超弹性。单P组织Ti-24Nb-4Zr-7.5Sn合金的杨氏模量最低为52 GPa，循环应变后的室温可恢复弹性应变约为2%。(c) 2006 Elsevier B.V.版权所有
Quaternary Ti-(20-26)Nb-(2-8)Zr-(3.5-11.5)Sn (.wt%) alloys were investigated to evaluate the effects of Zr and Sri on Young's modulus and superelasticity of Ti-Nb-based alloys. X-ray diffraction analysis showed that solution-treated alloys have beta + alpha", beta + omega, alpha" + omega, alpha", or beta microstructures. Zr and Sn increase the lattice parameters of the beta phase; for orthorhombic alpha" matensite, they increase the lattice parameter a but decrease both b and c. The martensitic start temperature of the alpha" is depressed by Zr and Sri additions, whereas the formation of athermal w is dependent on Zr and Sn contents. Differential scanning calorimetry (DSC) measurements show that 1 wt% of Nb, Zr or Sn addition decreases the martensitic start temperature by 17.6, 41.2 or 40.9 K, respectively, due to their negative effect on lattice parameter ratios of the martensite (c/a and b/a). Tensile tests were used to evaluate Young's modulus and superelasticity of the solution-treated alloys. Of the studied alloys Ti-24Nb-4Zr-7.5Sn with single P microstructure has the lowest Young's modulus of 52 GPa and recoverable elastic strain of about 2% at room temperature after cyclic strain. (c) 2006 Elsevier B.V. All rights reserved.