线性回归法建立Ti6Al4V合金超塑变形本构关系  

Constitutive relationship of Ti6Al4V alloy during superplastic deformation by linear regression method

作　　者：赵文娟[1] 张亚玲[1] 丁桦[1] 曹富荣[1] 王耀奇[2] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004 [2]北京航空制造工程研究所,北京100024

出　　处：《材料与冶金学报》2008年第3期201-205,共5页Journal of Materials and Metallurgy

基　　金：国家安全重大基础研究项目

摘　　要：材料的本构关系是描述材料变形的基本信息，是联系材料塑性变形过程中流动应力和变形工艺参数的桥梁．本文通过在Gleeblel500热模拟试验机上，在温度860—950℃、应变速率0．0005—0．05s^-1范围内对Ti6A14V（w[Al]：6％，w[V]=4％）合金进行超塑性等温压缩变形试验，分析了压缩变形过程中的变形行为．结果表明，Ti6M4V合金在超塑性压缩变形中，随着温度的升高或应变速率的降低，材料的流变应力显著降低，动态再结晶是其主要的软化机制．在实验数据的基础上采用多元线性回归方法建立了反映流动应力与各影响因素间关系的本构方程．Constitutive relationship is a kind of primary information of materials, which can describe intrinsic deformation behaviors and be a bridge between flow stress and processing parameters during plastic deformation. In this study, superplastic compression tests were carried out for Ti6Al4V （w [All =6%, w [V] =4%） alloy in a temperature range of 860 - 950 ℃ with a strain rate range of 0.0005 - 0.05s^ - 1 by Gleeble1500 stress-strain simulator. Deformation behaviors during superplastic compression were analyzed. The results show that tlow stress decreased with the increasing of temperature or decreasing of strain rate during superplastic compression deformation, and that dynamic recrystallization was the main softening mechanism. Then constitutive relationship of superplastic deformation was obtained on the basis of experimental data by multivariate linear regression method, which reflects the relationship between flow stress and its influencing factors satisfactorily.

关 键 词：TI6A14V合金 超塑性 本构关系 压缩变形 

分 类 号：TG146.2[一般工业技术—材料科学与工程]