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Acta Metall Sin    DOI: 10.3724/SP.J.1037.2013.00179
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INFLUENCES OF PHASE PRECIPITATIONS OF TERNARY βTi-Mo-Zr(Sn) ALLOYS ON YOUNG'S MODULUS AND MECHANICAL PROPERTIES
LI Qun, WANG Qing, LI Xiaona, GAO Xiaoxia, DONG Chuang
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education,School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024
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Abstract  

The influences of second phase precipitations of low Young's modulus (E) βTi alloys [MoTi14]Zr1 (Ti78.2Mo11.2Zr10.6) and [SnTi14]Mo1(Ti75.7Mo10.9Sn13.4) on mechanical properties as well as the variation of phase constitutions of alloys during tensile test were investigated. Alloy rods with 6 mm diameter were prepared by copper-mould suction-cast method. Phase precipitations and microstructures of alloys before and after tension were analyzed by XRD and TEM techniques. The experimental results showed that only a minor amount of   α〞martensite precipitated on β matrix makes the suction-cast [SnTi14]Mo1 alloy possess lower E with a value of 70 GPa, while ω precipitation increases the E (80 GPa) of [MoTi14]Zr1 alloy. It is due to the thinner β plate twins that makes [SnTi14]Mo1 alloy have better mechanical properties. During tensile testing, the amount of  α〞martensite induced by stress increases in [MoTi14]Zr1 alloy while β grains in [SnTi14]Mo1 alloy are easier to be rotated for deformation, which favors to enhance the ductility of alloys.

Key words:  Ti-Mo-Zr(Sn) alloy      β-Ti alloy      low Young's modulus      phase precipitation     
Received:  31 March 2013     

Cite this article: 

LI Qun, WANG Qing, LI Xiaona, GAO Xiaoxia, DONG Chuang. INFLUENCES OF PHASE PRECIPITATIONS OF TERNARY βTi-Mo-Zr(Sn) ALLOYS ON YOUNG'S MODULUS AND MECHANICAL PROPERTIES. Acta Metall Sin, 2013, 49(9): 1143-1147.

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00179     OR     https://www.ams.org.cn/EN/Y2013/V49/I9/1143

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