Double-peak age strengthening of cold-worked 2024 aluminum alloy

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	Double-peak age strengthening of cold-worked 2024 aluminum alloy
	Y. L. Zhao; Z. Q. Yang; Z. Zhang; G. Y. Su; X. L. Ma
	2013
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	61 期号:5 页码:1624-1638
摘要	The microstructure and mechanical properties of a 2024 Al alloy subjected to different levels of cold-rolling at room temperature and their evolution upon ageing at 453 K were investigated by means of microhardness measurements, tensile tests and transmission electron microscopy. The cold-worked 2024 Al alloy showed double-peak age strengthening behavior. After ageing for 120 min, the samples reached the first peak strength with quite low ductility. However, simultaneous high strength and ductility were achieved by prolonged ageing of 720 mm. The first strengthening peak is due to the precipitation of fine S' precipitates. The optimized mechanical properties of high strength and suitable ductility are attributed mainly to the precipitation of Omega-phase particles at the expense of S' precipitates after ageing for 720 mm. The Omega precipitates are effective in dislocation pinning and accumulation, and they can undergo plastic deformation to some extent, leading to simultaneously improved tensile strength, work-hardening ability and ductility. The present finding sheds light on the development of processing techniques to optimize the mechanical properties of 2024 Al alloy. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[zhao, y. l. ; yang, z. q. ; ma, x. l.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [zhang, z. ; su, g. y.] chinese acad sci, inst met res, precise tubing div, shenyang 110016, peoples r china. ; yang, zq (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. ; yangzq34@yahoo.com
关键词	2024 Al Alloy Precipitation Omega-phase Age Strengthening Ductility High-pressure Torsion Transmission Electron-microscopy Cu-mg Alloys Omega-phase Mechanical-properties Microstructural Evolution Grain-refinement Magnesium Alloy Precipitation Al
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71720
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. L. Zhao,Z. Q. Yang,Z. Zhang,et al. Double-peak age strengthening of cold-worked 2024 aluminum alloy[J]. Acta Materialia,2013,61(5):1624-1638.
APA	Y. L. Zhao,Z. Q. Yang,Z. Zhang,G. Y. Su,&X. L. Ma.(2013).Double-peak age strengthening of cold-worked 2024 aluminum alloy.Acta Materialia,61(5),1624-1638.
MLA	Y. L. Zhao,et al."Double-peak age strengthening of cold-worked 2024 aluminum alloy".Acta Materialia 61.5(2013):1624-1638.