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Superplastic behavior of Al-coated Mg alloy sheet

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Title: Superplastic behavior of Al-coated Mg alloy sheet
Authors: Tokunaga, Toko Browse this author
Matsuura, Kiyotaka Browse this author →KAKEN DB
Ohno, Munekazu Browse this author →KAKEN DB
Keywords: Mg alloy
Composite material
Mechanical property
Issue Date: 15-Jul-2014
Publisher: Elsevier
Journal Title: Journal of Alloys and Compounds
Volume: 601
Start Page: 179
End Page: 185
Publisher DOI: 10.1016/j.jallcom.2014.02.099
Abstract: An Al-coated Mg alloy sheet is fabricated by hot forging an Al-coated Mg alloy plate produced by hot extrusion of a Mg alloy billet together with an Al plate. The sheet consists of recrystallized fine grains both in the Mg alloy substrate and Al coating layer. A thin intermetallic compound layer of Al3Mg2 formed at the Al/Mg interface in the hot-extruded plate. The subsequent hot forging reduces the thickness of the intermetallic layer but induces cracks in the intermetallic compound. This sheet exhibits a large tensile elongation of 550% at 573 K and at a strain rate of 1.0 x 10 (3)s (1). Notably, a tensile test of an Al specimen exhibited only 40% elongation, while that of a Mg alloy specimen exhibited 800% elongation. It is suggested that the large elongation of Al as the coating layer on the Mg alloy is attributable to the good bonding of the Al coating layer and the Mg alloy substrate. The cracks in the intermetallic layer disappear during the tensile tests at elevated temperatures and no cracks are observed in the elongated specimens, which indicates growth of the intermetallic and reparation of the cracks occurred during the low strain-rate hot deformation of the Al-coated Mg alloy sheet.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 松浦 清隆

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