INFLUENCES OF PHASE PRECIPITATIONS OF TERNARY β－Ti－Mo－Zr(Sn) ALLOYS ON YOUNG'S MODULUS AND MECHANICAL PROPERTIES

doi:10.3724/SP.J.1037.2013.00179

Acta Metall Sin

2013, Vol. 49

Issue (9): 1143-1147 DOI: 10.3724/SP.J.1037.2013.00179

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

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Abstract

The influences of second phase precipitations of low Young's modulus (E) β－Ti alloys [MoTi₁₄]Zr₁ (Ti_78.2Mo_11.2Zr_10.6) and [SnTi₁₄]Mo₁(Ti_75.7Mo_10.9Sn_13.4) 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

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	LI Xiaona
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	DONG Chuang

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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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