Microstructure and mechanical properties of rolled sheets of Mg-Gd-Y-Zn-Zr alloy: As-cast versus as-homogenized

In this research, the as-cast and as-homogenized Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr alloy were subjected to the hot rolling with the same processing parameters. The microstructure and mechanical properties of the two kinds of as-rolled sheets were investigated. The sheet rolled from the as-cast alloy was mainly composed of recrystallized alpha-Mg grains surrounded by Mg-3(Gd,Y) eutectic compounds. While the sheet rolled from the as-homogenized alloy was composed of large deformed grains with long-period stacking ordered (LPSO) phase inside and fewer recrystallized alpha-Mg grains, and exhibited higher strength due to the deformed grains with stronger basal texture and larger volume fraction of long-period stacking ordered (LPSO) phase. (C) 2012 Elsevier B.V. All rights reserved.