Effect of rolling and heat treatment on microstructure and mechanical properties of Mg3.5Y0.8Ca0.4Zr alloy

The effect of rolling and heat treatment on microstructure and mechanical properties of Mg3.5Y0.8Ca0.4Zr alloy was investigated. With the addition of 0.4Zr, the average grain size of the as-cast alloy was markedly refined to 5–10 μm. After hot rolling process, the grain size of Mg3.5Y0.8Ca0.4Zr alloy was refined further into 3–5 μm and the tensile strength was enhanced while the plasticity was degraded because the accumulation of rolling reduction increased the density of twins, and refined the grain structures. After the solution heat treatment at 743 K, the elongation of alloy was greatly enhanced from 3% to 17%.