Microstructural evolution of cast Mg-Al-Zn during friction stir processing and subsequent aging

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	Microstructural evolution of cast Mg-Al-Zn during friction stir processing and subsequent aging
	A. H. Feng; Z. Y. Ma
	2009
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	57 期号:14 页码:4248-4260
摘要	Mg-Al-Zn casting was subjected to two friction stir processing (FSP) protocols: single-pass with a pre-solution treatment (Pre-ST) and two-pass. Both the two-pass FSP and Pre-ST FSP produced uniform recrystallized microstructures with similar grain sizes of 7.5-8.7 mu m and high ratios of high-angle grain boundaries of 95.9-97.5%; however, the boundary misorientation distributions were quite different for the two samples. For the Pre-ST FSP sample, a significant proportion of {1 0 (1) over bar 2} twins were operative, with a complex and significantly weakened texture component. The mechanism of dynamic recrystallization (DRX) was mainly twinning DRX and continuous DRX (CDRX). However, for the two-pass FSP sample, the twins were significantly reduced, with a simple < 0 0 0 2 > texture component, and DRX was mainly associated with CDRX and discontinuous DRX A post-FSP aging resulted in the precipitation of beta-Mg(17)Al(12) phase in continuous and discontinuous forms. Most of the continuous precipitates had a Burgers orientation relationship, namely: (0001)(Mg)parallel to(1 1 0)Mg(17)Al(12), [1 (2) over bar 1 0]Mg parallel to [1 (1) over bar 1]Mg(17)Al(12). The origin of the different microstructural characteristics in the two samples was discussed. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[feng, a. h.; ma, z. y.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china.;ma, zy (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china;zyma@imr.ac.cn
关键词	Friction Stir Processing Magnesium Alloys Recrystallization Twinning Grain Refining Magnesium Alloy Dynamic Recrystallization Discontinuous Precipitation Strengthening Mechanisms Chemical Nanoanalysis Pure Magnesium Grain-size Deformation Metals Temperature
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WOS记录号	WOS:000268653000028
引用统计	被引频次：131[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/321006/31895
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	A. H. Feng,Z. Y. Ma. Microstructural evolution of cast Mg-Al-Zn during friction stir processing and subsequent aging[J]. Acta Materialia,2009,57(14):4248-4260.
APA	A. H. Feng,&Z. Y. Ma.(2009).Microstructural evolution of cast Mg-Al-Zn during friction stir processing and subsequent aging.Acta Materialia,57(14),4248-4260.
MLA	A. H. Feng,et al."Microstructural evolution of cast Mg-Al-Zn during friction stir processing and subsequent aging".Acta Materialia 57.14(2009):4248-4260.