通过TEM研究了固溶态及直接时效态Inconel 718合金的蠕变变形组织.结果表明:固溶态Inconel 718合金,在550℃/220 MPa条件下达到1%变形量时,蠕变组织的特征为位错交滑移;而直接时效态Inconel 718合金,在680℃/650 MPa条件下达到1%变形量时,蠕变组织中既有位错滑移后形成的变形带,又存在位错攀移,并且存在少量的孪晶变形.讨论了Inconel 718合金中发生蠕变孪晶的机制,着重从y″强化相的晶体学特征来解释该现象.研究结果认为:具有特殊结构的y″强化相是影响合金蠕变变形机制的根源.
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