利用动态塑性变形(DPD)技术对纯钛圆柱样品进行动态压缩试验,研究了高应交下出现的绝热剪切带(ASB)及两侧过渡区的显微组织和硬度分布.结果发现:ASB仅出现在动态压缩应变大于等于0.6的DPD样品中,在准静态压缩对比试验中未出现,表明其受应变速率和应变两者共同影响.剪切带内部硬度略低于基体,而过渡区硬度明显低于基体.通过Zerilli-Armstrong本构模型和热扩散距离计算分析表明,计算的过渡区与绝热温升热影响区宽度与试验结果基本相符,初始晶粒动态再结晶形成等轴晶组织并引起组织软化.
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