Ti811合金棒材的热稳定性能和蠕变性能

Thermal stability and creep behavior of Ti811 alloy rods

系统地研究了合金成分Ａｌ含量、拉应力和温度对Ｔｉ８１１合金棒材热稳定性能的影响，对合金的蠕变性能也进行了定性研究。结果表明：Ａｌ含量降低、应力和温度升高，则残余变形量增大；４２５℃／１００ｈ／４１０ＭＰａ热暴露，Ａｌ含量大于８（ｗｔ％）时，合金的热稳定性塑性急剧降低；不高于４７５℃暴露（０～４７５℃／１００ｈ／４１０ＭＰａ）以及４２５℃不同应力热暴露（０～４９０ＭＰａ／１００ｈ／４２５℃），合金具有较好的热稳定性。采用ＳＥＭ和ＴＥＭ技术分析了性能改变的原因。

A systematic investigation on the effects of content,tensile stress and temperature on the ther-mal stability of Ti811 alloy reds is performed and a qualitative investigation on its creep behavior is also con-ducted.The results indicate that the residual strain will increase with the decrease in Al content and increase in stress and temperature,and a rapid decrease in the thermal stability and plasticity will occur under the con-dition of an exposure at 425℃ for 100h.and stress of 410MPa with Al content more than 8 wt%,The re-sults also show that the alloy has good thermal stability when exposed at a temperature of less than 475℃ for 100h with stress equal to 410MPa and exposed at 425℃for 100h.with stress less than 490 MPa. Further-more the cause for the change of its properties is analyzed by using SEM and TEM.