Metastable β-type Ti-30Nb-1Mo-4Sn Alloy with Ultralow Young’s Modulus and High Strength

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• 作者：Liang Hu (1)
  Shun Guo (1)
  Qingkun Meng (1)
  Xinqing Zhao (1)
  
• 刊名：Metallurgical and Materials Transactions A
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：45
• 期：2
• 页码：547-550
• 全文大小：375 KB
• 作者单位：Liang Hu (1)
  Shun Guo (1)
  Qingkun Meng (1)
  Xinqing Zhao (1)
  
  1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, P. R. China
  
• ISSN：1543-1940

文摘

The effect of thermo-mechanical treatment on the mechanical properties of a novel metastable β-type Ti-30Nb-1Mo-4Sn (wt?pct) alloy has been investigated. The solution-treated alloy consists of β and α-phases and exhibits a two-stage yielding with a low yield stress (around 100?MPa). After cold rolling at a reduction of 87.5?pct and subsequent annealing treat at 623?K (350?°C) for 30?minutes, a fine microstructure with nano-sized α precipitates distributed in small β grains as well as high density of dislocations was obtained to achieve a yield strength of 954?MPa and an ultimate tensile strength of 999?MPa. With low stability of β phase and small volume fraction of α precipitates, the annealed specimen exhibits a low Young’s modulus of 45?GPa. Such an excellent combination of the low elastic modulus and high strength in mechanical properties indicates a great potential candidate for biomedical applications.