Superplasticity of directionally solidified NiAl-15Cr alloy at high temperature

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	Superplasticity of directionally solidified NiAl-15Cr alloy at high temperature
	G. Y. Zhang; H. Zhang; H. A. Zhang; X. M. Wu; J. T. Guo
	2006
发表期刊	Journal of Iron and Steel Research International
ISSN	1006-706X
卷号	13 期号:4 页码:44-48
摘要	Ni-25Al-15Cr (atomic percent, %) alloy was directionally solidified (DS) under argon atmosphere in an Al2O3-SiO2 ceramic mold by standard Bridgman method. The microstructure of the as-fabricated alloy was studied using optical microscope, X-ray diffractometer, and scanning electron microscope. The alloy consisting of dendritic beta-NiAl phase, interdendritic gamma/gamma' phase, and transient layer gamma' phase, has been investigated. This alloy exhibits superplastic deformation behavior at 1 273-1 373 K over an initial strain rate range of 8.35 X 10(-4)-1.67 x 10(-2) s(-1). The maximum elongation of 280% with strain rate sensitivity index m=0.22 was obtained at the temperature of 1 323 K and an initial strain rate of 8.35 x 10(-3) s(-1). Transmission electron microscopy (TEM) observations indicate that the superplastic deformation stems from the balance between high resistance (by dislocation sliding) and strain softening (by dynamic recovery and recrystallization).
部门归属	hunan univ sci & technol, sch electromech engn, xiangtan 411201, hunan, peoples r china. chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china.;zhang, gy (reprint author), hunan univ sci & technol, sch electromech engn, xiangtan 411201, hunan, peoples r china;zhangguangye7411@163.com
关键词	Intermetallics Directional Solidification Superplasticity Microstructure Mechanical-properties Constituent Phases Behavior
URL	查看原文
WOS记录号	WOS:000240885500010
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34683
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. Y. Zhang,H. Zhang,H. A. Zhang,et al. Superplasticity of directionally solidified NiAl-15Cr alloy at high temperature[J]. Journal of Iron and Steel Research International,2006,13(4):44-48.
APA	G. Y. Zhang,H. Zhang,H. A. Zhang,X. M. Wu,&J. T. Guo.(2006).Superplasticity of directionally solidified NiAl-15Cr alloy at high temperature.Journal of Iron and Steel Research International,13(4),44-48.
MLA	G. Y. Zhang,et al."Superplasticity of directionally solidified NiAl-15Cr alloy at high temperature".Journal of Iron and Steel Research International 13.4(2006):44-48.