Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt

IMR OpenIR

	Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt
	X. L. Wu; N. R. Tao; Q. M. Wei; P. Jiang; J. Lu; K. Lu
	2007
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	55 期号:17 页码:5768-5779
摘要	Nanocrystalline intermetallic Co3Fe7 was produced on the surface of cobalt via surface mechanical attrition (SMA). Deformationinduced diffusion entailed the formation of a series of solid solutions. Phase transitions occurred depending on the atomic fraction of Fe in the surface solid solutions: from hexagonal close-packed (<4% Fe) to face-centered cubic (fcc) (4-11% Fe), and from fcc to body-centered cubic (>11% Fe). Nanoscale compositional probing suggested significantly higher Fe contents at grain boundaries and triple junctions than grain interiors. Short-circuit diffusion along grain boundaries and triple junctions dominate in the nanocrystalline intermetallic compound. Stacking faults contribute significantly to diffusion. Diffusion enhancement due to high-rate deformation in SMA was analyzed by regarding dislocations as solute-pumping channels, and the creation of excess vacancies. Non-equilibrium, atomic level alloying can then be ascribed to deformation-induced intermixing of constituent species. The formation mechanism of nanocrystalline intermetallic grains on the SMA surface can be thought of as a consequence of numerous nucleation events and limited growth. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	chinese acad sci, inst mech, state key lab nonlinear mech, beijing 100080, peoples r china. chinese acad sci, met res inst, shenyang natl lab mat sci, shenyang 110016, peoples r china. univ n carolina, dept mech engn & engn sci, charlotte, nc 28223 usa. hong kong polytech univ, dept mech engn, kowloon, hong kong, peoples r china.;wu, xl (reprint author), chinese acad sci, inst mech, state key lab nonlinear mech, beijing 100080, peoples r china;xlwu@imech.ac.cn
关键词	Nanocrystalline Materials Diffusion Intermetallics Surface Mechanical Attrition Severe Plastic-deformation High-pressure Torsion Triple Junctions Nanostructured Materials Magnetic-properties Enhanced Diffusion Self-diffusion Pipe Diffusion Alloys Dislocations
URL	查看原文
WOS记录号	WOS:000250355700010
引用统计	被引频次：61[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/321006/33922
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. L. Wu,N. R. Tao,Q. M. Wei,et al. Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt[J]. Acta Materialia,2007,55(17):5768-5779.
APA	X. L. Wu,N. R. Tao,Q. M. Wei,P. Jiang,J. Lu,&K. Lu.(2007).Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt.Acta Materialia,55(17),5768-5779.
MLA	X. L. Wu,et al."Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt".Acta Materialia 55.17(2007):5768-5779.