三元&beta;－Ti－Mo－Zr(Sn)合金析出相对弹性模量和力学性能的影响

李群; 王清; 李晓娜; 高晓霞; 董闯

doi:10.3724/SP.J.1037.2013.00179

金属学报 >

2013 , Vol. 49 >Issue 9: 1143 - 1147

DOI: https://doi.org/10.3724/SP.J.1037.2013.00179

论文

三元β－Ti－Mo－Zr(Sn)合金析出相对弹性模量和力学性能的影响

李群 ,
王清 ,
李晓娜 ,
高晓霞 ,
董闯

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大连理工大学三束材料改性教育部重点实验室, 大连理工大学材料科学与工程学院, 大连 116024

李群, 女, 1989年生, 硕士生

收稿日期: 2013-03-31

修回日期: 2013-07-11

网络出版日期: 2013-09-11

基金资助

国家自然科学基金项目51171035, 11174044和51131002资助

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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

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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

Received date: 2013-03-31

Revised date: 2013-07-11

Online published: 2013-09-11

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摘要

研究了低弹性模量β－Ti合金[MoTi₁₄]Zr₁(Ti_78.2Mo_11.2Zr_10.6)和[SnTi₁₄]Mo₁(Ti_75.7Mo_10.9Sn_13.4)中第二相析出对弹性模量和力学性能的影响及其拉伸过程中合金组成相的变化.利用Cu模吸铸快冷技术制备了直径6 mm的合金棒,并采用XRD和TEM分析合金拉伸前后的相析出行为及组织. 结果表明,在β基体上只有少量α〞的析出使得[SnTi₁₄]Mo₁合金具有较低的弹性模量(70 GPa),而ω相的存在使得[MoTi₁₄]Zr₁合金的弹性模量略高(80 GPa);且[SnTi₁₄]Mo₁合金中较细的薄片状β孪晶组织使得合金具有优良的力学性能.在拉伸过程中, [MoTi₁₄]Zr₁合金中应力诱发的马氏体含量增加,而在[SnTi₁₄]Mo₁合金中β基体晶粒易于发生扭转, 从而合金塑性提高.

关键词： Ti－Mo－Zr(Sn)合金; β－Ti合金; 低弹性模量; 相析出

本文引用格式

李群 , 王清 , 李晓娜 , 高晓霞 , 董闯 . 三元β－Ti－Mo－Zr(Sn)合金析出相对弹性模量和力学性能的影响[J]. 金属学报, 2013 , 49(9) : 1143 -1147 . DOI: 10.3724/SP.J.1037.2013.00179

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

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