magnesium alloy ingot AZ91D High strength and corrosion resistance with ASTM standard best quality AZ91D alloy Chemical composition AZ91D: Mg remainder Al 8.5%-9.5% Zn 0.45%-0.90% Mn 0.17%-0.40% Si 0.05% Fe 0.004% Cu 0.025% Ni 0.001% Be 5-15ppm Other each