为研究TA17近α钛合金在高能喷丸(HESP)过程中的晶粒细化机制,采用高能喷丸对TA17近α钛合金棒材端面进行处理,利用光学显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射仪对喷丸变形层组织进行表征,按照变形层中不同深度的组织特征对晶粒细化机制进行探讨.结果表明:在喷丸表面形成35 nm左右的等轴纳米晶,在孪晶形成层中粗晶内形成较厚的孪晶薄片,在过渡层中位错滑移使孪晶薄片内生成小角度取向的亚晶,在纳米层中亚晶被转变成随机取向的等轴纳米晶.
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