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Gleeble1500热模拟试验机上,在温度860～950 ℃、应变速率0.0005～0.05 s-1范围内对Ti6Al4V(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,Ti6Al4V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.
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