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材料工程  2014 

TC4-DT合金的超塑性变形及其本构方程

DOI: 10.11868/j.issn.1001-4381.2014.09.011, PP. 63-67

Keywords: TC4-DT合金,动态再结晶,超塑性变形

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Abstract:

采用CMT4104电子万能拉伸试验机分别进行温度为870℃,应变速率为3.3×10-4s-1的恒应变速率和温度为850~890℃,应变速率为3.3×10-5~3.3×10-3s-1的应变速率循环法超塑性拉伸实验。结果表明在变形过程中存在动态回复与动态再结晶现象,并采用Avrami方程描述了动态再结晶动力学行为;基于应变速率循环法获得了TC4-DT合金的本构模型,再通过1stopt软件加以回归拟合,得到较为精确的TC4-DT合金超塑性变形本构方程。

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