研究了热等静压态NiAl-28Cr-5.5Mo-0.5Hf-0.012P合金的高温蠕变行为.结果表明:实验合金具有较短的减速蠕变阶段和相当长的稳态蠕变阶段以及很高的蠕变应变;在研究的实验条件范围内,合金的蠕变变形机制为低温高应力下的位错粘滞滑移控制和高温低应力下的位错攀移控制;蠕变后合金的显微组织变化不大,表明蠕变断裂受孔洞及裂纹的形成和扩展所控制,而且蠕变断裂行为符合修正后的Monkman-Grant规律:lntf+0.775lnε=1.104.
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