Diffusion of chromium in nanocrystalline iron produced by means of surface mechanical attrition treatment

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	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
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	51 期号:14 页码:4319-4329
摘要	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.
部门归属	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
关键词	Nanocrystalline Surface Mechanical Attrition Treatment Thermal Stability Diffusion Grain Boundary Grain-boundary Diffusion Positron-lifetime Copper Alloys Spectroscopy Hydrogen Nickel Metals Layer
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WOS记录号	WOS:000184761600027
引用统计	被引频次：280[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/321006/36068
专题	中国科学院金属研究所
推荐引用方式 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.