应变速率循环法构建TC4-DT钛合金本构方程  

Superplastic Constitutive Relationship of TC4-DT Titanium Alloy with Strain Rate Circulation Method

作　　者：郑漫庆[1] 王高潮[1] 喻淼真[1] 徐雪峰[1] 

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063

出　　处：《材料工程》2014年第8期32-35,共4页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51075196);江西省教育厅基金资助项目(GJJ12451)

摘　　要：采用应变速率循环法在超塑拉伸机上对TC4-DT钛合金进行三组高温超塑性拉伸实验,变形温度为850～890℃,应变速率为3.3×10^-5～3.3×10^-3s-1.通过对拉伸实验数据的分析计算出TC4-DT钛合金动态再结晶激活能,并利用Arrhenius模型构建TC4-DT高温条件下的超塑性本构方程.结果表明：TC4-DT钛合金的流动应力对变形温度较为敏感,随着温度的升高,流变应力逐渐减小,软化机制愈发明显,870℃附近的超塑性较好,伸长率达到554％.The superplastic deformation behavior of TC4-DT titanium alloy was performed on super- plastic tensile testing machine at 850-890℃, and with strain rates range of 3.3 ×10^-5～3.3×10^-3s-1 based on the strain rate circulation method. The dynamic recrystallization activation energy was calcu- lated through analysis of the tensile experimental data. The constitutive relationship of the TC4-DT titanium alloy based on the Arrhenius model was established. The results show that the flow stress of TC4-DT titanium alloy is sensitive to the deformation temperature. With the increasing of tempera- ture, flow stress decreases and softening mechanism increases. The superplasticity around 870℃ is better and the elongation is 554%.

关 键 词：应变速率循环 本构方程 超塑性变形 

分 类 号：TG14[一般工业技术—材料科学与工程]