微观应力和应变对Ti-6Al-2Zr-1Mo-1V合金力学性能的影响分析（英文）  

Effect of Microscopic Stress and Strain on Mechanical Properties of Ti-6Al-2Zr-1Mo-1V Alloy

作　　者：吉喆[1] 郭涛 沈承金[1] 徐杰[1] Ji Zhe;Guo Tao;Shen Chengjin;Xu Jie(China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学

出　　处：《稀有金属材料与工程》2019年第12期3806-3811,共6页Rare Metal Materials and Engineering

基　　金：Fundamental Research Funds for the Central Universities of China（2015QNA04）

摘　　要：分析组成相对钛合金力学性能的影响对组织设计极为重要。通过真实组织有限元模型分析了αp和βt中的应力和应变,并定量揭示了他们对Ti-6Al-2Zr-1Mo-1V钛合金强度和韧性的影响。结果表明,αp和βt中的应力呈现正态分布。βt的峰值应力和应力峰高远大于αp。然而,αp具有较大的峰值应变,βt具有较大的应变峰高。随着αp体积分数从49%降低到12%,βt对抗拉强度的贡献从59%增加到91%,对失效应变的贡献从36%增加到75%。然而,随着βt贡献的增加,合金抗拉强度增加了17%,失效应变降低了21%。研究结果定量揭示了组成相对强度和韧性的贡献,为钛合金组织设计提供了基础。Analysis of the effect of constituent phases on mechanical properties is critical to the design of microstructure of titanium alloys.For this reason,the microscopic stress and strain in soft primary a(ap) and hard transformed/3 matrix(/3 t) were quantitatively analyzed by a microstructure-based finite element model to determine their effect on strength and ductility of Ti-6 Al-2 Zr-1 Mo-1 V alloy.The results show that microscopic stress in both αp and βt shows a normal distribution.The peak stress and stress peak height ofβt are much larger than those of αp.While,αp has large peak strain and βt has large strain peak height.As αp volume fraction decreases from 49% to 12%,the contribution of βt to ultimate tensile strength(UTS) and failure strain(FS) of the alloy increases from 59% to91% and 36% to 75%,respectively.However,as the contribution of increases,UTS of the alloy increases by 17% and FS decreases by 21%.This finding quantitatively reveals the effect of constituent phases on strength and ductility and provides a basis to the design of microstructure of titanium alloys.

关 键 词：微观应力和应变 组成相 力学性能 钛合金 有限元模拟 

分 类 号：TG146.23[一般工业技术—材料科学与工程]