Microstructure and mechanical properties of aged Mg-Gd-Y-Zr-Ag alloy sheets processed by different rolling routes

Abstract

Microstructure and mechanical properties of aged Mg-10Gd-2Y-0.4Zr-0.4Ag alloy sheets prepared by different rolling routes were investigated. The results showed that the cross rolling aged (CRA) sheet possesses larger grain size than unidirectional rolling aged (URA) sheet due to the occurrence of dynamic recovery during rolling which reduces the dislocation density and delays dynamic recrystallization (DRX). The URA sheet has basal texture and RD-favored texture while CRA sheet has multiple-peak texture. Both sheets precipitate β′ phase and CRA sheet exhibits a stronger aging response. The CRA sheet has higher yield strength and tensile strength than URA sheet, with reduced yield strength anisotropy but increased tensile strength anisotropy. Taking into account different strengthening mechanisms, although the finer grain size of URA sheet enhances grain boundary strengthening, CRA sheet is more responsive to aging, leading to superior aging-precipitated phase strengthening and consequently higher yield strength.

Keywords

Mg-Gd-Y-Zr-Ag alloy / rolling routes / aging precipitation / microstructure / strengthening mechanism

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