采用喷射成形技术制备一种新型镍基高温合金,并对其进行热等静压处理.在Gleeble-3500热力模拟试验机上进行热压缩试验,利用光学显微镜、扫描电镜(SEM)以及透射电镜(TEM)等方法对其变形机制进行研究.结果表明,高应变速率(10 s-1)下变形,摩擦产生的热量使试样的实际变形温度高于名义变形温度,促进了动态再结晶组织的形成;高应变速率下形成的孪晶可进一步激发滑移变形,而亚晶内形成的大量位错对变形起到协调作用,保证了变形顺利进行;建立了再结晶晶粒尺寸模型,表明随应变速率的增加,晶粒尺寸减小,合金变形能力增加,这与实验结果相一致.
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