Diffusion of Zn in Nanostructured Aluminum Alloys Produced by Surface Mechanical Attrition Treatment

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	Diffusion of Zn in Nanostructured Aluminum Alloys Produced by Surface Mechanical Attrition Treatment
	H. W. Chang; P. M. Kelly; Y. N. Shi; M. X. Zhang
	2012
发表期刊	Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN	1073-5623
卷号	43A 期号:7 页码:2378-2389
摘要	After surface nanocrystallization of pure Al and a cast Al-Si alloy through surface mechanical attrition treatment (SMAT), 200- to 300-mu m-thick Zn coatings were deposited on the nanostructured surface using the clod spray technique. Subsequently, diffusion of Zn into the Al substrate was induced by postspray annealing treatment at various temperatures for different times. The diffusion kinetics of Zn in the nanostructured surface layers was studied in terms of the Zn concentration profile in the substrate by using scanning electron microscopy (SEM) and electron probe microscopy analysis (EPMA). Experimental results show that not only the diffusivity of Zn in the nanocrystalline grains is significantly increased compared with the diffusion in the coarse grained counterpart, but the temperature at which noticeable Zn diffusion in Al alloys occurs is also reduced from 573 K (300 A degrees C) in coarse-grained Al alloys to 523 K (250 A degrees C) in nanostructured alloys. In addition, because the nanocrystalline grains produced by SMAT in Al-Si alloys are much smaller than those in pure Al due to the effect of eutectic Si, the diffusion of Zn in the SMATed Al-Si alloy is much faster than that in the SMATed pure Al. It is believed that the high diffusivity of Zn in the nanocrystalline Al grains is attributed to the large fraction of grain boundaries that act as fast diffusion channel. The effect of thermal stability of the nanocrystalline grains on Zn diffusion in the SMATed Al alloys is also discussed.
部门归属	[chang, h. -w.; kelly, p. m.; zhang, m. -x.] univ queensland, sch mech & min engn, div mat, brisbane, qld 4072, australia. [shi, y. -n.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;chang, hw (reprint author), univ queensland, sch mech & min engn, div mat, brisbane, qld 4072, australia.;mingxing.zhang@uq.edu.au
关键词	Cold Spray Coatings Nanocrystalline Copper Nickel Layers Iron
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/59892
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. W. Chang,P. M. Kelly,Y. N. Shi,et al. Diffusion of Zn in Nanostructured Aluminum Alloys Produced by Surface Mechanical Attrition Treatment[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2012,43A(7):2378-2389.
APA	H. W. Chang,P. M. Kelly,Y. N. Shi,&M. X. Zhang.(2012).Diffusion of Zn in Nanostructured Aluminum Alloys Produced by Surface Mechanical Attrition Treatment.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,43A(7),2378-2389.
MLA	H. W. Chang,et al."Diffusion of Zn in Nanostructured Aluminum Alloys Produced by Surface Mechanical Attrition Treatment".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 43A.7(2012):2378-2389.