研究了TC4合金在中温变形过程中形成的绝热剪切带,应变速率为50 s-1,变形温度为560～660℃.结果表明变形温度对绝热剪切带的形成有很大影响.剪切带宽度随着变形温度的升高从85 μm增加至140 μm.因为发生了加工硬化和绝热剪切带中产生的细晶强化作用,绝热剪切带对应的维氏显微硬度比基体高.讨论了绝热剪切带中微观组织演变规律,大应变以及高温使得绝热剪切带中发生了动态再结晶,形成了等轴的再结晶晶粒,再结晶晶粒尺寸为200 nm左右.本研究中形成的绝热剪切带具有形变剪切带和相变剪切的特点.
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