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Advances in Materials Science and Engineering
Volume 2017, Article ID 4065434, 9 pages
https://doi.org/10.1155/2017/4065434
Research Article

Effect of Reduction in Thickness and Rolling Conditions on Mechanical Properties and Microstructure of Rolled Mg-8Al-1Zn-1Ca Alloy

1Magnesium Division, Gonda Metal Industry Co. Ltd., Sagamihara, Kanagawa 252-0212, Japan
2Structural Materials Research Institute of Advanced Industrial Science and Technology (AIST), Nagoya, Aichi 463-8560, Japan

Correspondence should be addressed to Masafumi Noda; pj.en.noid.7s@adon-km

Received 8 March 2017; Revised 17 May 2017; Accepted 31 May 2017; Published 5 July 2017

Academic Editor: Jörg M. K. Wiezorek

Copyright © 2017 Yuta Fukuda et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A cast Mg-8Al-1Zn-1Ca magnesium alloy was multipass hot rolled at different sample and roll temperatures. The effect of the rolling conditions and reduction in thickness on the microstructure and mechanical properties was investigated. The optimal combination of the ultimate tensile strength, 351 MPa, yield strength, 304 MPa, and ductility, 12.2%, was obtained with the 3 mm thick Mg-8Al-1Zn-1Ca rolled sheet, which was produced with a roll temperature of 80°C and sample temperature of 430°C. This rolling process resulted in the formation of a bimodal structure in the α-Mg matrix, which consequently led to good ductility and high strength, exclusively by the hot rolling process. The 3 mm thick rolled sheet exhibited fine (mean grain size of 2.7 μm) and coarse grain regions (mean grain size of 13.6 μm) with area fractions of 29% and 71%, respectively. In summary, the balance between the strength and ductility was enhanced by the grain refinement of the α-Mg matrix and by controlling the frequency and orientation of the grains.