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应用电镜及Ｘ线衍射技术，研究了高温下Ｎｉ_（７５）Ａｌ_（１６．６）Ｃｒ_（７．８４）Ｚｒ_（０．４５）Ｂ_（０．１）Ｍｇ_（０．０１）合金晶界失效行为。经１１８０℃保温，由于偏聚晶界区Ｍｇ含量（ａｔ．－％）达１５－１９。同时Ｚｒ含量（ａｔ，－％）明显增大可达２８－３３；并观察到局部晶界共晶熔化现象。通过１０００℃固溶及变温热循环处理，合金中晶内出现ＣｒＮ相沉淀，沿晶界有Ｃｒ２（Ｃ，Ｎ）相析出。
The grain boundaries of Ni_ (75) Al_ (16.6) Cr_ (7.84) Zr_ (0.45) B_ (0.1) Mg_ (0.01) alloys were studied by means of XRD and TEM. behavior. After 1180 ℃ heat preservation, due to partial polycrystalline grain boundary Mg content (at .-%) up to 15-19. At the same time, the content of Zr (at, -%) obviously increases up to 28-33; and local eutectic melting phenomenon is observed. The results show that CrN precipitates in the grains and precipitates Cr2 (C, N) along the grain boundaries through the solution treatment at 1000 ℃ and the thermal cycling at varying temperatures.