Superplasticity in a directionally solidiried multiphase Ni-25Al-25Cr alloy

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	Superplasticity in a directionally solidiried multiphase Ni-25Al-25Cr alloy
	J. T. Guo ; J. Zhou
刊名	Zeitschrift Fur Metallkunde
	2004
卷号	95 期号:1 页码:22-26
关键词	NiAl superplastic behavior casting microstructure internal-stress superplasticity polycrystalline materials large grains transformation deformation microstructure intermetallics mechanism creep iron
ISSN号	0044-3093
中文摘要	A Ni-25Al-25Cr (at.%) alloy was directionally solidified under Ar atmosphere in an A1(2)O(3)-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.
原文出处	://WOS:000220698900006
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/35366]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	J. T. Guo,J. Zhou. Superplasticity in a directionally solidiried multiphase Ni-25Al-25Cr alloy[J]. Zeitschrift Fur Metallkunde,2004,95(1):22-26.
APA	J. T. Guo,&J. Zhou.(2004).Superplasticity in a directionally solidiried multiphase Ni-25Al-25Cr alloy.Zeitschrift Fur Metallkunde,95(1),22-26.
MLA	J. T. Guo,et al."Superplasticity in a directionally solidiried multiphase Ni-25Al-25Cr alloy".Zeitschrift Fur Metallkunde 95.1(2004):22-26.