Krishna, K. Gopala and Singh, Nidhi and Venkateswarlu, K. and Kumar, K. C. Hari (2010) Tensile Behavior of Ultrafine-Grained Al-4Zn-2Mg Alloy Produced by Cryorolling. Journal of Materials Engineering and Performance, 20 (9). pp. 1569-1574. ISSN 1059-9495

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Abstract

An Al-4Zn-2Mg alloy was subjected to cryorolling (CR) followed by short annealing. An average grain size of similar to 100 nm was achieved. Cryorolled samples showed large reduction in grain size due to suppression of dynamic recovery and absence of annihilation of dislocations, as compared to room temperature rolled samples. Further, the ultrafine-grained (UFG) Al-4Zn-2Mg alloy when subjected to natural aging showed an improved strength of similar to 413 MPa with ductility of similar to 25%, as compared to similar to 360 MPa and 22% ductility in peak aged condition of coarse-grained alloy. However, UFG alloy in peak aging condition, exhibited a relatively strength (similar to 375 MPa) and 24% ductility combinations than the natural aging condition. The latter is attributed to dynamic precipitation and stored energy. In the present study, it is demonstrated that simultaneous improvement in strength as well as ductility can be achieved for the Al-4Zn-2Mg alloy through CR and controlled heat treatment combinations.

Item Type:	Article
Uncontrolled Keywords:	aging; Al-4Zn-2Mg alloy; cryorolling; secondary precipitation; tensile behavior; ultrafine-grain structure
Subjects:	Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	12 Oct 2012 07:02
Last Modified:	12 Oct 2012 07:02
URI:	http://npl.csircentral.net/id/eprint/682

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