王梓凡,黄龙,吴书婷,章天助,缪森,董显娟,魏科,魏康,涂泽立

• 1:南昌航空大学材料科学与工程学院

摘要(Abstract)：

采用Gleeble-3500热模拟实验机对片层组织的TC18合金进行热压缩实验，利用光学显微镜和电子背散射衍射技术等研究了高温变形过程中合金的热变形行为及微观组织演变机理。结果表明：在热变形过程中，片层α相发生扭折和弯曲、动态球化，然而α相的演变分布表现出明显的区域差异性；当变形量较小时，组织中产生了大量的小角度晶界和少量的大角度晶界，丛域内的片层α相取向基本一致，β相的<001>方向近似平行于压缩方向；随着变形量增大、位错不断的增殖，片层α和β相发生连续动态再结晶，同时，片层α的剧烈的扭曲也会促进相邻β的不连续再结晶，导致织构的强度不断减小，然而由于微织构区域存在，使得织构难以被消除，微织构区域内α相的演变取决于其尺寸和应力方向的共同作用；当变形量增加60%时，α相织构的成分发生了明显的变化，形成了压缩织构，并且片层α和β两相之间的Burgers取向关系遭到了很大程度的破坏；相较于单道次变形，双道次变形有利于片层α相的球化，使得α相取向表现出更分散的分布，织构强度也更低。

关键词(KeyWords)： TC18钛合金;片层组织;组织演变;晶体取向;球化机制

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52565045,52301152);; 江西省自然科学基金(20224BAB204045,20232BAB214009)

作者(Author): 王梓凡,黄龙,吴书婷,章天助,缪森,董显娟,魏科,魏康,涂泽立

DOI: 10.13289/j.issn.1009-6264.2024-0603

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