采用X射线衍射(XRD)方法测算镍基粉末冶金高温合金FGH97中γ和γ＇相的晶格常数,计算出γ/γ＇晶格错配度.结果表明:γ＇相的晶格常数比γ相的小,错配度为负值.Hf主要存在于γ＇相中,随着合金中Hf加入量的增加,进入γ＇相中Hf的数量增加,使γ＇相的晶格常数逐渐增大,错配度的绝对值逐渐减小.
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