The structural transitions during leaching of Ni2Al3 phase in a Raney Ni-Al alloy

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	The structural transitions during leaching of Ni2Al3 phase in a Raney Ni-Al alloy
	R. Wang; Z. L. Lu; T. Ko
	2001
发表期刊	Journal of Materials Science
ISSN	0022-2461
卷号	36 期号:23 页码:5649-5657
摘要	The microstructure transitions during leaching of a rapidly solidified Ni-Al alloy have been investigated by means of X-ray diffraction, transmission electron microscopic (TEM) and high resolution electron microscopic (HREM) techniques. Ni2Al3 was the main phase in the starting Ni-Al alloy. The microstructure of the Raney nickel catalyst consists of nano-scale nickel crystallites, residue of source phases surrounded by nano-scale boundary regions. The transformation during leaching of Ni2Al3 phase was an advancing interface type process. Clusters of AuCu-structure type face-centrered tetragonal Ni3Al2 as an intermediate phase seems to appear in the reaction front. Based on an analysis of the atomic configurations of phases Ni2Al3, Ni3Al2 and nickel, a reasonable explanation for the transition mechanism during leaching of Ni2Al3 phase and the arc characteristic of diffraction spots was proposed. The nickel crystallites generated during leaching obey an orientation relationship with the source Ni2Al3 phase, which is consistent with the Delannay's orientation relationship proposed for nickel and NiAl phases. The nano-scale structural characteristic of the Raney nickel catalyst, especially its porous structure at the boundary regions, provides an excellent hydrogenation catalytic activity and selectivity of the catalyst. (C) 2001 Kluwer Academic Publishers.
部门归属	univ sci & technol beijing, dept mat phys, beijing 100083, peoples r china. chinese acad sci, inst met res, atom imaging solids lab, shenyang 110015, peoples r china.;wang, r (reprint author), univ sci & technol beijing, dept mat phys, beijing 100083, peoples r china
关键词	Nickel
URL	查看原文
WOS记录号	WOS:000172012400018
引用统计	被引频次：17[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/321006/36828
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	R. Wang,Z. L. Lu,T. Ko. The structural transitions during leaching of Ni2Al3 phase in a Raney Ni-Al alloy[J]. Journal of Materials Science,2001,36(23):5649-5657.
APA	R. Wang,Z. L. Lu,&T. Ko.(2001).The structural transitions during leaching of Ni2Al3 phase in a Raney Ni-Al alloy.Journal of Materials Science,36(23),5649-5657.
MLA	R. Wang,et al."The structural transitions during leaching of Ni2Al3 phase in a Raney Ni-Al alloy".Journal of Materials Science 36.23(2001):5649-5657.