Grain Size Dependence of Yield Strength in Randomly Textured Mg-Al-Zn Alloy

Abstract

The randomly textured Mg-Al-Zn alloy processed by electron beam welding typically exhibits clear grain size dependence of yield strength according to the Hall-Petch relationship: σ_0.2=62+202d^−1⁄2. The Schmid factor for the basal slip system was deduced to be around 0.031 in the randomly textured Mg alloys. The σ₀ in the Hall-Petch equation was theoretically calculated to be ∼65 MPa, which is reasonably consistent with the experimental data of ∼62 MPa.