材料科学
微观结构
体积分数
等温过程
应变率
变形(气象学)
动态再结晶
合金
层状结构
复合材料
冶金
流动应力
位错
热加工
热力学
物理
作者
Lin Xiang,Bin Tang,Hongchao Kou,Jie Shao,Jian Li
出处
期刊:Materials Science Forum
日期:2017-06-01
标识
DOI:10.4028/www.scientific.net/msf.898.137
摘要
Isothermal compression tests were conducted to investigate the effect of hot deformation parameters on flow behavior and microstructure of Ti-6Al-4V-0.2O alloy. The experimental results show that the strain rate and height reduction have little effect on the volume fraction of primary α at a deformation temperature of 860 ̊C. At a deformation temperature of 940 ̊C, the volume fraction of primary α at a high strain rate (10s -1 ) is about 10% less than that at low strain rates (0.01s -1 ~1s -1 ). It may be one of the reasons for the significantly discontinuous yielding phenomenon. Another reason is that the dislocation density decreased suddenly due to the dynamic recovery. With the increasing strain rate and the decreasing deformation temperature, the volume fraction of irregular secondary α increases and lamellar secondary α decreases. And with height reduction increasing, the irregular secondary α increases firstly and then tends to be steady because of dynamic recovery and recrystallization.
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