Influence of chemical composition and alloying elements on microdefects and electron density in Ni-Al alloys

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	Influence of chemical composition and alloying elements on microdefects and electron density in Ni-Al alloys
	W. Deng; Y. Y. Huang; D. H. Wu; L. Y. Xiong; S. H. Wang; J. T. Guo
	2002
发表期刊	Transactions of Nonferrous Metals Society of China
ISSN	1003-6326
卷号	12 期号:3 页码:370-374
摘要	Positron lifetime spectra have been measured in binary Ni-Al alloys with different chemical composition and NiAl alloys doped with Cr, Zr, Fe and Mg. The results indicate that in B2-NiAl and Ll(2)-Ni3Al alloys, some of the valance electrons of Ni and Al atoms are localized, which leads to a lower free electron density of the alloy. The mean free electron density of the binary Ni-Al alloy decreases with increasing Al content. The open volume of defects on grain boundary of the Ni3Al is larger than that of monovacancy or dislocation. Structural vacancies and microvoids are found in B2-NiAl alloys with Al content above 45% (mole fraction), and the concentration of the vacancies and open volume of microvoids will increase with higher Al content. The addition of Cr, Zr and Fe into a NiAl alloy can increase its mean free electron density and reduce the open volume of defects on its grain boundary, while with addition of Mg into the NiAl alloy, its mean free electron density decreases and open volume of boundary defects increases.
部门归属	guangxi univ, dept phys, nanning 530004, peoples r china. chinese acad sci, met res inst, shenyang 110016, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.
关键词	Ni-al Alloy Chemical Composition Alloying Element Microdefect Electron Density Positron-lifetime Ni3al Fracture Defects Boron Ductilization Ductility
URL	查看原文
WOS记录号	WOS:000176130500003
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/321006/36258
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. Deng,Y. Y. Huang,D. H. Wu,et al. Influence of chemical composition and alloying elements on microdefects and electron density in Ni-Al alloys[J]. Transactions of Nonferrous Metals Society of China,2002,12(3):370-374.
APA	W. Deng,Y. Y. Huang,D. H. Wu,L. Y. Xiong,S. H. Wang,&J. T. Guo.(2002).Influence of chemical composition and alloying elements on microdefects and electron density in Ni-Al alloys.Transactions of Nonferrous Metals Society of China,12(3),370-374.
MLA	W. Deng,et al."Influence of chemical composition and alloying elements on microdefects and electron density in Ni-Al alloys".Transactions of Nonferrous Metals Society of China 12.3(2002):370-374.