HIGH TEMPERATURE INTERGRANULAR EMBRITTLEMENT OF Ni_3Al-Cr-Zr-B-Mg ALLOY

Acta Metall Sin

1994, Vol. 30

Issue (9): 394-398 DOI:

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HIGH TEMPERATURE INTERGRANULAR EMBRITTLEMENT OF Ni_3Al-Cr-Zr-B-Mg ALLOY

D U Guowei;WANG Zheng;ZHANG Dezhi;XIAO Jimei(University of Science and Technology Beijing)(Manuscript received 27 January;1994)

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D U Guowei;WANG Zheng;ZHANG Dezhi;XIAO Jimei(University of Science and Technology Beijing)(Manuscript received 27 January;1994). HIGH TEMPERATURE INTERGRANULAR EMBRITTLEMENT OF Ni_3Al-Cr-Zr-B-Mg ALLOY. Acta Metall Sin, 1994, 30(9): 394-398.

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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.Correspondent: DU Guowei, associate professor.(Departement of Materials Physics,University of Science and Technology, Beijing, Beijing 100083)

Key words: Ni_3Al-base alloy grain boundary segregation eutectic melting noneqilibrium segregation

Received: 18 September 1994

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