【摘要】 应用电镜及Ｘ线衍射技术，研究了高温下Ｎｉ_７５Ａｌ_１６．６Ｃｒ_７．８４Ｚｒ_０．４５Ｂ_０．１Ｍｇ_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。更多还原

【Abstract】 By electron microscopy and X-ray diffraction techniques, the high temperature intergranular failure of Ni75Al16.6Cr7.84Zr0.45B0.1Mg0.01 alloy has been studied. The content of Mg is about 15-19 at.-%. in the region of grain boundary in the alloy due to segregation after prior exposure at 1180℃, the content of Zr is 28-33 at.-%; and the localized eutectic grain boundary melting in the alloy was observed. The precipitation of CrN inside the grains and Cr2(C,N) along the grain boundaries occurred by solid solution and thermal cycling treatments.更多还原