Superplasticity and deformation mechanisms in NiAl(-Mo) alloy

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	Superplasticity and deformation mechanisms in NiAl(-Mo) alloy
	X. H. Du; J. T. Guo; L. Z. Zhou
	2004
发表期刊	Materials Science and Technology
ISSN	0267-0836
卷号	20 期号:1 页码:82-86
摘要	The mechanical behaviour and microstructural evolution in tension of NiAl-9Mo eutectic alloy at 1100degreesC and strain rates from 10(-5) to 10(-3) s(-1) have been investigated. High values of strain rate sensitivity index, but relatively small elongations between 150 and 200%, have been observed. Tensile specimens with various strains were quenched in water to preserve the dislocation structures for TEM examination. The TEM results show that the dislocation configuration and density change significantly with an increase in strain rate, and therefore correspond to different deformation mechanisms. At a low strain rate (5(.)5 x 10(-5) s(-1)), the dislocation density is relatively low and dislocation activity is regarded as an accommodation mechanism for grain boundary sliding. In contrast, the high density of dislocations as well as clear subboundaries observed in grains at a high strain rate (5(.)5 x 10(-4) s(-1)) suggest that the dislocations are active directly in response to the applied stress as well as participating in the relaxation process of grain boundary sliding by subboundary formation. Thus, grain boundary sliding is mainly responsible for superplastic deformation at a low strain rate, while superlastic deformation at a high strain rate is controlled by the combined operation of both grain boundary sliding and dynamic recovery.
部门归属	chinese acad sci, inst met res, dept superalloys & intermetall, shenyang 110016, peoples r china.;du, xh (reprint author), chinese acad sci, inst met res, dept superalloys & intermetall, 72 wenhua rd, shenyang 110016, peoples r china;jtguo@imr.ac.cn
关键词	Nial-9mo Superplasticity Deformation Mechanism Microstructure Dislocation Activity Arrangement State Zn
URL	查看原文
WOS记录号	WOS:000188845600013
引用统计	被引频次：1[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/321006/35353
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. H. Du,J. T. Guo,L. Z. Zhou. Superplasticity and deformation mechanisms in NiAl(-Mo) alloy[J]. Materials Science and Technology,2004,20(1):82-86.
APA	X. H. Du,J. T. Guo,&L. Z. Zhou.(2004).Superplasticity and deformation mechanisms in NiAl(-Mo) alloy.Materials Science and Technology,20(1),82-86.
MLA	X. H. Du,et al."Superplasticity and deformation mechanisms in NiAl(-Mo) alloy".Materials Science and Technology 20.1(2004):82-86.