| Diffusion of chromium in nanocrystalline iron produced by means of surface mechanical attrition treatment | |
| Z. B. Wang; N. R. Tao; W. P. Tong; J. Lu; K. Lu | |
| 2003 | |
| Source Publication | Acta Materialia
 |
| ISSN | 1359-6454 |
| Volume | 51Issue:14Pages:4319-4329 |
| Abstract | By means of surface mechanical attrition treatment (SMAT) to a pure iron plate, a nanometer-grained surface layer without porosity and contamination was fabricated. The average grain size in the top surface layer (of 5 mum thick) is about 10-25 nm, and the grain size stability can be maintained up to 653 K. Cr diffusion kinetics in the nanocrystalline Fe phase was measured by using second ion mass spectrometry within a temperature range of 573-653 K. Experimental results showed that diffusivity of Cr in the nanocrystalline Fe is 7-9 orders of magnitude higher than that in Fe lattice and 4-5 orders of magnitude higher than that in the grain boundaries (GBs) of alpha-Fe. The activation energy for Cr diffusion in the Fe nanophase is comparable to that of the GB diffusion, but the pre-exponential factor is much higher. The enhanced diffusivity of Cr may originate from a large volume fraction of non-equilibrium GBs and a considerable amount of triple junctions in the present nanocrystalline Fe sample processed by means of the SMAT technique. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| description.department | chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. univ technol troyes, lasmis, f-10000 troyes, france.;lu, k (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china |
| Keyword | Nanocrystalline Surface Mechanical Attrition Treatment Thermal Stability Diffusion Grain Boundary Grain-boundary Diffusion Positron-lifetime Copper Alloys Spectroscopy Hydrogen Nickel Metals Layer |
| URL | 查看原文 |
| WOS ID | WOS:000184761600027 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/36068 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | Z. B. Wang,N. R. Tao,W. P. Tong,et al. Diffusion of chromium in nanocrystalline iron produced by means of surface mechanical attrition treatment[J]. Acta Materialia,2003,51(14):4319-4329. |
| APA | Z. B. Wang,N. R. Tao,W. P. Tong,J. Lu,&K. Lu.(2003).Diffusion of chromium in nanocrystalline iron produced by means of surface mechanical attrition treatment.Acta Materialia,51(14),4319-4329. |
| MLA | Z. B. Wang,et al."Diffusion of chromium in nanocrystalline iron produced by means of surface mechanical attrition treatment".Acta Materialia 51.14(2003):4319-4329. |
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