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

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	Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt
	Wu XL(武晓雷); Tao NR; Wei QM; Jiang P; Lu J; Lu K
刊名	Acta Materialia
	2007
通讯作者邮箱	xlwu@imech.ac.cn
卷号	55 期号:17 页码:5768-5779
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
ISSN号	1359-6454
通讯作者	Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
中文摘要	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.
类目[WOS]	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
研究领域[WOS]	Materials Science ; Metallurgy & Metallurgical Engineering
关键词[WOS]	SEVERE PLASTIC-DEFORMATION ; HIGH-PRESSURE TORSION ; TRIPLE JUNCTIONS ; NANOSTRUCTURED MATERIALS ; MAGNETIC-PROPERTIES ; ENHANCED DIFFUSION ; SELF-DIFFUSION ; PIPE DIFFUSION ; ALLOYS ; DISLOCATIONS
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000250355700010
公开日期	2009-08-03 ; 2010-06-13
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/33893]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Wu XL,Tao NR,Wei QM,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	武晓雷,Tao NR,Wei QM,Jiang P,Lu J,&Lu K.(2007).Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt.Acta Materialia,55(17),5768-5779.
MLA	武晓雷,et al."Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt".Acta Materialia 55.17(2007):5768-5779.