铸态TB6钛合金热变形行为及本构关系

中国有色金属学报, 2010, 20(z1): 377-380.

铸态TB6钛合金热变形行为及本构关系

雷力明 ^1, , 黄旭 ^2, , 黄利军 ^3, , 曹春晓 ^4,

1.北京航空材料研究院,北京,100095

2.北京航空材料研究院,北京,100095

3.北京航空材料研究院,北京,100095

4.北京航空材料研究院,北京,100095

基金项目: 国家重点基础研究发展计划项目资助(2007CB613803)

关键词：铸态TB6钛合金 , 热变形 , 本构关系

Hot deformation behavior and constitutive relationship of as-cast TB6 alloy

通过等温恒应变速率压缩实验研究铸态TB6钛合金在温度为800～1 100 ℃,应变速率为10-3～1 s-1条件下的热变形行为.结果表明:应变速率对铸态TB6合金流变应力的影响最显著,其次是变形温度,而应变的影响作用最小.在低温高应变速率下,流变应力曲线呈连续软化特征,而在高温低应变速率下,流变应力曲线呈稳态流变特征.铸态TB6合金的热变形激活能为200 kJ/mol,接近纯钛β相的自扩散激活能,表明在实验条件范围内主要发生动态回复过程.在Arrhenius方程基础上考虑了应变对流变应力曲线的影响,建立了能准确描述铸态TB6钛合金流变应力曲线的双曲正弦本构关系.

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铸态TB6钛合金热变形行为及本构关系

Hot deformation behavior and constitutive relationship of as-cast TB6 alloy

参考文献