On the structure, mechanical behavior, and deformation mechanism of AZ91 magnesium alloy processed by symmetric and asymmetric rolling

Abstract

In this study, the microstructural evolution, texture, and mechanical properties of AZ91 magnesium alloy rolled by symmetric and asymmetric rolling with 14%, 24% reduction, is presented. The study indicated that at identical deformation, the strength of the asymmetric rolled alloy was slightly greater than the symmetric rolled alloy, and the elongation was greatly enhanced because of finer grain size and weak {0001}//ND basal texture. The properties of the transverse direction (TD) samples are better than that in the rolling direction (RD), which is attributed to the TD samples having a {1¯1¯20}//TD texture. The TD sample by asymmetric rolled with a reduction of 24% had excellent mechanical properties with strength and elongation of 413 MPa and 5.08%, respectively, due to its fully recrystallized grains, the increase of {112¯3}//ND texture and favorable Schmid factor.