研究了定向凝固DZ951镍基高温合金在长期时效过程中的组织演化.结果表明:随着时效温度和时间的增加,γ′粗化形筏.形筏时间随时效温度的升高而减少.形筏驱动力为弹性应变能和界面能的降低.γ′长大受元素扩散控制,长大遵循LSW理论,长大激活能为294kJ/mol左右.由于DZ951合金γ′相中含有较多的高熔点元素W,Mo和Nb等,从而提高γ′相的稳定性,增加γ′长大激活能.合金在长期时效过程中未出现拓扑密排相(Topological Close-Packed Phase, TCP Phase)等有害相,表明DZ951合金具有较好的组织稳定性.
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