MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of Accumulative Roll Bonding (ARB) and Subsequent Aging on Microstructure and Mechanical Properties of 2024 Al Alloy
Ruixiao ZhengTilak BhattacharjeeAkinobu ShibataNobuhiro TsujiChaoli Ma
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2016 Volume 57 Issue 9 Pages 1462-1470

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Abstract

In this study, bulk nanostructured 2024 Al alloy sheets with optimized strength and ductility were successfully prepared through an effective thermo-mechanical process including solution treatment, heavy deformation by accumulative roll bonding (ARB) and cold rolling (CR), and subsequent low temperature aging. A lamellar boundary structure with mean grain thickness of 40 nm could be clearly observed after 3-cycle ARB and 50% CR with total equivalent strain of 3.2. The ultimate tensile strength and elongation to failure of the ARB+CR processed sample were 599 MPa and 1.7%, respectively. After subsequent low temperature aging at 100℃ for 20 h, the ultimate tensile strength and elongation to failure became 635 MPa and 7%, respectively, showing simultaneously increased strength and ductility compared to the cold-worked state. The reasons for the superior mechanical properties were discussed.

Fig. 10 TEM microstructures of the ARB+CR processed 2024 Al alloy sample aged at 100℃ for 20 h: (a) a bright field image and corresponding SAD pattern, (b) dark field image of (a), (c) higher magnification image of the region marked by the white-broken rectangular in (a), and (d) thickness distribution of the lamellas measured from (a). Fullsize Image
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© 2016 The Japan Institute of Metals and Materials
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