A Ni-25Al-25Cr (at.%) alloy was directionally solidified under Ar atmosphere in an Al2O3 - SiO2 ceramic mold by the standard Bridgman method. The microstructure of the as-fabricated alloy was studied using optical microscopy, X-ray diffraction and scanning electron microscopy. The alloy was composed of beta-NiAl dendritic arms, alpha-Cr interdendritic regions, fine alpha-Cr particles in the dendritic arms, and beta-NiAl + alpha-Cr eutectic in the interdendritic regions. The mechanical properties were studied by tensile tests in the temperature range 1123-1373 K. The results showed that the alloy exhibits superplastic behavior at appropriate testing conditions. The balance between work hardening (by dislocation glide) and work softening (by dynamic recovery and recrystallization) is responsible for the large tensile elongation of the alloy.
Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714
Guo, J. T.,Zhou, J.. Superplasticity in a directionally solidified multiphase Ni-25Al-25Cr alloy[J]. INTERNATIONAL JOURNAL OF MATERIALS RESEARCH,2021,95(1):22-26.
APA
Guo, J. T.,&Zhou, J..(2021).Superplasticity in a directionally solidified multiphase Ni-25Al-25Cr alloy.INTERNATIONAL JOURNAL OF MATERIALS RESEARCH,95(1),22-26.
MLA
Guo, J. T.,et al."Superplasticity in a directionally solidified multiphase Ni-25Al-25Cr alloy".INTERNATIONAL JOURNAL OF MATERIALS RESEARCH 95.1(2021):22-26.
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