采用光学显微镜和SEM研究了热处理对定向镍基高温合金DZ951组织的影响.结果表明:选择合适的热处理工艺,能使铸态合金中较大的错配度减小甚至消失.固溶温度越高,γ'相的尺寸越大.在1200℃及其以上温度固溶处理时,γ'才能完全固溶于基体.固溶温度相同时,随着保温时间的延长,γ'相的尺寸增大.在1220℃固溶后进行时效处理,随着时效温度的升高,析出γ'相的尺寸增大.时效温度越高,γ'相的长大趋势越明显.合金经固溶处理和二级时效处理后,可获得两种尺寸的γ'相.
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