Investigation of annealing behavior of nanocrystalline NiAl

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	Investigation of annealing behavior of nanocrystalline NiAl
	L. Z. Zhou; J. T. Guo; G. S. Li; L. Y. Xiong; S. H. Wang; C. G. Li
	1997
发表期刊	Materials & Design
ISSN	0261-3069
卷号	18 期号:4-6 页码:373-377
摘要	Nanocrystalline NiAl prepared by mechanical alloying and the vacuum heat pressing method has been studied to investigate its thermal stability. Isothermal annealing was conducted at 1000 degrees C. The results show that a significant grain growth takes place from 30 nm at the initial state to 56 nm by annealing for 30 h, then maintains this value regardless of annealing time up to 100 h. Microhardness test results show that the microhardness of the annealed specimens reduces significantly with annealing time up to 5 h and then increases slightly with further annealing due to off-stoichiometry. in addition, positron annihilation spectroscopy has been used to investigate the interfacial defects in the nanocrystalline NiAl specimens. The results show that there are three kinds of defects in the interfacial region of the nano-NiAl alloy, which are monovacancy-sized free volumes, microvoids and large voids. During the present annealing process, the sizes of the three defects have no significant change, but the amount of the defects, especially for monovacancy-sized free volumes and microvoids varies clearly with annealing time. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
部门归属	beijng inst aeronaut mat, beijing 100095, peoples r china. chinese acad sci, dept superalloy & intermetall, inst met res, shenyang 110015, peoples r china.
关键词	Nanocrystalline Nial Annealing Behavior Thermal Stability Temperature Tensile Ductility Grain-growth Mechanical-properties Intermetallic Compounds System Alloys
URL	查看原文
WOS记录号	WOS:000073649100033
引用统计	被引频次：18[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/321006/38239
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. Z. Zhou,J. T. Guo,G. S. Li,et al. Investigation of annealing behavior of nanocrystalline NiAl[J]. Materials & Design,1997,18(4-6):373-377.
APA	L. Z. Zhou,J. T. Guo,G. S. Li,L. Y. Xiong,S. H. Wang,&C. G. Li.(1997).Investigation of annealing behavior of nanocrystalline NiAl.Materials & Design,18(4-6),373-377.
MLA	L. Z. Zhou,et al."Investigation of annealing behavior of nanocrystalline NiAl".Materials & Design 18.4-6(1997):373-377.