EFFECTS OF Zr ON GRAIN BOUNDARY AND MECHANICAL PROPERTIES IN Ni_3Al ALLOYS

Acta Metall Sin

1995, Vol. 31

Issue (3): 120-124 DOI:

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EFFECTS OF Zr ON GRAIN BOUNDARY AND MECHANICAL PROPERTIES IN Ni_3Al ALLOYS

GUO Jianting (Institute of Metal Research; Chinese Academy of Sciences;Shenyang 110015) GU Yue feng; LIN Dongliang (Shanghai Jiaotong University;Shanghai 200030)

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GUO Jianting (Institute of Metal Research; Chinese Academy of Sciences;Shenyang 110015) GU Yue feng; LIN Dongliang (Shanghai Jiaotong University;Shanghai 200030). EFFECTS OF Zr ON GRAIN BOUNDARY AND MECHANICAL PROPERTIES IN Ni_3Al ALLOYS. Acta Metall Sin, 1995, 31(3): 120-124.

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Abstract The yield and ultimate strengths increase with the amount of Zr increasing. If an additive of Zr less than 0.7 at.-％. the elongation of the alloy increases with Zr content growing. If Zr added up to 1.2 at-％. the effect of Zr improving ductility of the alloy is fall off. Auger study indicated that the amount of Zr segregated to the GB is about 3 times greater than that in the bulk. SEM investigation showed that the fracture mode changes from intergranular in Ni-24.0 Al and Ni-24.0 Al-1.2Zr (in at.-％) alloys to the mixed of interand trans-granular in Ni-24.0 Al-0.3 Zr and Ni-24.0 Al-0.7 Zr (in at.-％) alloys. These results manifested that the effect of Zr improving the ductility in Ni3Al has strong relationship with the segregation of Zr at GB.

Key words: Ni_3Al Zr mechanical property grain boundary

Received: 18 March 1995

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1995/V31/I3/120

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