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。
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.Correspondent: DU Guowei, associate professor.(Departement of Materials Physics,University of Science and Technology, Beijing, Beijing 100083)
参考文献
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| [6] | 青木清,和泉修,日本金属学会志,1979 |
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