Microstructural evolution and formation of nanocrystalline intermetallic compound during surface mechanical attrition treatment of cobalt
文献类型：期刊论文
| 作者 | X. L. Wu ; N. R. Tao ; Q. M. Wei ; P. Jiang ; J. Lu ; K. Lu |
| 刊名 | Acta Materialia
 |
| 出版日期 | 2007 |
| 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 |
| 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. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/33922]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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