Knowledge Management System of Institue of Mechanics, CAS
| 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; Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
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| Source Publication | Acta Materialia
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| 2007 | |
| Volume | 55Issue:17Pages:5768-5779 |
| ISSN | 1359-6454 |
| Abstract | 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. |
| Keyword | 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 |
| DOI | 10.1016/j.actamat.2007.06.030 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000250355700010 |
| WOS Keyword | SEVERE PLASTIC-DEFORMATION ; HIGH-PRESSURE TORSION ; TRIPLE JUNCTIONS ; NANOSTRUCTURED MATERIALS ; MAGNETIC-PROPERTIES ; ENHANCED DIFFUSION ; SELF-DIFFUSION ; PIPE DIFFUSION ; ALLOYS ; DISLOCATIONS |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/33893 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Wu, XL (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China. |
| Recommended Citation 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.,...&Wu, XL .(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. |
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