TA15钛合金的热变形微观组织与织构

Microstructures and textures of TA15 titanium alloy after hot deformation

采用X线衍射仪和EBSD分析研究近α型TA15钛合金在不同工艺参数下的热压缩变形组织和织构演变规律。结果表明:TA15合金热变形后淬火组织中存在针状马氏体α′相;晶粒在(101)和(002)滑移面上的滑移率先达到临界分切应力,发生塑性变形,使组织细化,并最终导致变形组织的择优取向;在小应变速率(0.01 s-1)和低变形温度(950℃)条件下,动态再结晶分数较高,产生较强的再结晶织构;随着变形温度和应变速率的升高,材料晶粒取向性减弱。

The microstructures and textures of TA15 titanium alloy after hot deformation under different process parameters were investigated by X-ray diffractometry （XRD） and electron back scattering diffractometry （EBSD）. The results indicate that microstructures of TA15 alloy appear obvious acicular martensiteα′phase after hot deformation and quenching. The plastic deformation is going to occur in the slip systems of （101） and （002） slip planes by first reaching the critical resolved shear stress. The strong recrystallization textures are achieved at low deformation temperature and low strain rate, which will be weakened with increasing the strain rate and temperature.