Thermal stability of nanocrystallized surface produced by surface mechanical attrition treatment in aluminum alloys

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	Thermal stability of nanocrystallized surface produced by surface mechanical attrition treatment in aluminum alloys
	H. W. Chang; P. M. Kelly; Y. N. Shi; M. X. Zhang
	2012
发表期刊	Surface & Coatings Technology
ISSN	0257-8972
卷号	206 期号:19-20 页码:3970-3980
摘要	Nanostructured surface layers were produced on pure Al (AA196) and an Al-Si (A356) alloy plates using surface mechanical attrition treatment (SMAT) technique. Thermal stability of the refined grains in the nanocrystalline and sub-micron layers and in the adjacent deformation region induced by SMAT was investigated through characterization of the evolution of microstructure during post-SMAT annealing treatment within the temperature range from 150 to 370 degrees C for 1 and 24 h using both optical microscopy and transmission electron microscopy. Experimental results show that, during the annealing process, within the deformation region, typical recrystallization occurs, but, destabilization of the nanocrystalline and the sub-micron grains within the nanostructured layer and the sub-micron layer takes place through direct grain coarsening. It was also found, in both pure Al and A356 alloy, that nanocrystalline grains that are associated with high angle grain boundaries have higher thermal stability than the grains that are separated by low angle grain boundaries in the sub-micron layer. The possible grain coarsening mechanisms of these two types of grains are discussed. In addition, compared to SMATed pure Al samples, the broken eutectic Si particles in the SMATed A356 alloy dramatically enhance the thermal stability of the nanocrystalline grains, but have little effect on the sub-micron grains. Furthermore, it was also found that the thermal stability of the nanostructured grains in the SMATed affected zone in both alloys is independent on the SMAT duration. (c) 2012 Elsevier B.V. All rights reserved.
部门归属	[chang, h. -w.; kelly, p. m.; zhang, m. -x.] univ queensland, sch mech & min engn, div mat, st lucia, qld 4072, australia. [shi, y. -n.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;zhang, mx (reprint author), univ queensland, sch mech & min engn, div mat, st lucia, qld 4072, australia.;mingxing.zhang@uq.edu.au
关键词	Nanocrystalline Grains Thermal Stability Al Alloys Surface Mechanical Attrition Treatment Low-carbon Steel Layer Iron Microstructure Nanostructures Temperature Evolution
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/59893
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. Thermal stability of nanocrystallized surface produced by surface mechanical attrition treatment in aluminum alloys[J]. Surface & Coatings Technology,2012,206(19-20):3970-3980.
APA	H. W. Chang,P. M. Kelly,Y. N. Shi,&M. X. Zhang.(2012).Thermal stability of nanocrystallized surface produced by surface mechanical attrition treatment in aluminum alloys.Surface & Coatings Technology,206(19-20),3970-3980.
MLA	H. W. Chang,et al."Thermal stability of nanocrystallized surface produced by surface mechanical attrition treatment in aluminum alloys".Surface & Coatings Technology 206.19-20(2012):3970-3980.