Effect of eutectic Si on surface nanocrystallization of Al-Si alloys by surface mechanical attrition treatment

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	Effect of eutectic Si on surface nanocrystallization of Al-Si alloys by surface mechanical attrition treatment
	H. W. Chang ; P. M. Kelly ; Y. N. Shi ; M. X. Zhang
刊名	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
	2011
卷号	530 页码:304-314
关键词	SMAT Al-Si cast alloy Nanocrystalline material Grain refinement Dislocation gliding induced grain-refinement pure titanium steel layer evolution
ISSN号	0921-5093
中文摘要	Pure Al (AA196) and Al-Si (A356) alloy were subjected to surface nanocrystallization through surface mechanical attrition treatment (SMAT). Strain induced microstructure evolution, including grain refinement of Al matrix and Si particles, was examined using transmission electron microscopy. Nanocrystallization of Al matrix in both pure Al and A356 alloy occurs through formation of dislocation cells separated by dense dislocation walls and dislocation tangle within the original coarse grains or subdivided subgrains. During SMAT, the brittle Si phase is preferentially refined through direct breakage. The Al matrix refinement process is greatly facilitated by the dispersed small Si particles, because such particles can not only act as obstacles for dislocation movement, but also promote dislocation generation and multiplication. Comparing to pure Al, thicker nanouystalline zone can be obtained with much smaller stabilized nano-metered grains in the Al-Si alloy. Due to the low diffusion rate of Si in Al matrix at low temperature, there is no obvious re-dissolve of Si particles into Al during SMAT process. (C) 2011 Elsevier B.V. All rights reserved.
原文出处	://WOS:000298311100038
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/30247]
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	H. W. Chang,P. M. Kelly,Y. N. Shi,et al. Effect of eutectic Si on surface nanocrystallization of Al-Si alloys by surface mechanical attrition treatment[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2011,530:304-314.
APA	H. W. Chang,P. M. Kelly,Y. N. Shi,&M. X. Zhang.(2011).Effect of eutectic Si on surface nanocrystallization of Al-Si alloys by surface mechanical attrition treatment.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,530,304-314.
MLA	H. W. Chang,et al."Effect of eutectic Si on surface nanocrystallization of Al-Si alloys by surface mechanical attrition treatment".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 530(2011):304-314.