Flow behavior and mechanisms of NiAl-9Mo alloy during superplastic deformation

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	Flow behavior and mechanisms of NiAl-9Mo alloy during superplastic deformation
	J. T. Guo; X. H. Du; B. D. Zhou
	2002
发表期刊	Intermetallics
ISSN	0966-9795
卷号	10 期号:5 页码:435-440
摘要	The superplastic deformation of the as-extruded NiAl-9NIo eutectic alloy is observed as a function of temperature and strain rate, and characterized by the constitutive equation and the deformation microstructure. In the region of high strain rate (and low temperature), the flow curve exhibits a stress peak followed by weak softening, and then by a dynamic restoration (DR) process. The activation energy of deformation in this region is estimated to be Q = 207 kJ/mol, similar to that of bulk diffusion in NiAl. It is suggested that the mechanism associated with DR is responsible for the deformation in this region. In the region of low strain rate (and high temperature) the flow curve exhibits continuous work hardening until fracture, and concomitant grain boundary sliding and grain growth occur. The activation energy of deformation in this region is estimated to be Q = 113 kJ/mol suggestive of grain boundary diffusion in NiAl. Larger tensile elongation, i.e., superplastic deformation, is observed in the latter region. (C) 2002 Elsevier Science Ltd. All rights reserved.
部门归属	chinese acad sci, inst met res, shenyang 110016, peoples r china. harbin inst technol, sch mat sci & engn, harbin 15001, peoples r china.;guo, jt (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china
关键词	Nickel Aluminides (Based On Nial) Grain Boundaries Plastic Deformation Mechanism Structure Superplastic Forming Intermetallics
URL	查看原文
WOS记录号	WOS:000175576800006
引用统计	被引频次：2[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/321006/36276
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. T. Guo,X. H. Du,B. D. Zhou. Flow behavior and mechanisms of NiAl-9Mo alloy during superplastic deformation[J]. Intermetallics,2002,10(5):435-440.
APA	J. T. Guo,X. H. Du,&B. D. Zhou.(2002).Flow behavior and mechanisms of NiAl-9Mo alloy during superplastic deformation.Intermetallics,10(5),435-440.
MLA	J. T. Guo,et al."Flow behavior and mechanisms of NiAl-9Mo alloy during superplastic deformation".Intermetallics 10.5(2002):435-440.