Ti14合金半固态塑性变形的热力模拟

Deformation simulation of Ti14 alloy in semi-solid state

利用Gleeble1500热/力模拟机研究了Ti14合金在应变速率为5×10-3～5 s-1,变形温度为1273～1423 K,变形量为60%条件下的半固态塑性变形行为。分析了合金流变应力与应变速率、变形温度之间的关系,根据分析结果建立了Ti14合金半固态变形流变本构方程,结果表明:合金在半固态条件下存在明显的屈服现象,流变应力受温度和应变速率影响较大,稳态流变应力和峰值流变应力随温度的增加而减小,相同温度下,流变应力随应变速率的增加而增加,分析可能是由于液相含量和分布对初生α-Ti骨架的解聚作用所致。

Hot deformation behavior of Ti14 alloy was investigated on a Gleedle1500 simulator or with strain rate of 5×10-3-5 s-1 and deformation temperature of 1273-1423 K.The relationship between flow stress and deformation temperature as well as strain rate were analyzed and the deformation activation energy were calculated.The results show that the alloy expresses obvious yield point,the strain rate and deformation temperature have strong effects on the flow stress.The flow stress decreases with increasing of deformation temperature and decreasing of strain rate,which is considered to be associated with the decomposing effects of the liquid of different fraction and distribution on α-Ti matrix.