Patent ID: 6908516

Claim:
A magnesium-based alloy made by a chill-block casting technique, said magnesium-based alloy comprising a porosity-free microstructure and at least one alloying element or alloying addition in a solid solution and said chill-block casting technique being selected from the group consisting of continuous chill block casting, thin-strip casting, twin-roller quenching, thin-wall casting, pressure die casting to a wall thickness less than 20 mm, planar flow casting and melt spinning, wherein said porosity-free microstructure comprises a homogeneous distribution of at least one solute atom of the at least one alloying element or alloying addition and a maximum content of critical impurities by weight of 0.0005% Ni, 0.0013% Fe and 0.0005% Cu and no corrosion-rate controlling Fe inclusion, and wherein said porosity-free microstructure is in an as-solidified state or after an alloy conversion selected from the group consisting of one or more of the following: a thermo-mechanical treatment or rolling or superplastic forming, a hot forming operation or hot pressing, a forging or an extrusion, a communition to flakes or powder and a forging or an extrusion, a cold pressing or a cold isostatic pressing, a solution or homogenisation heat treatment, a thermo-mechanical treatment or a hot forming operation at temperatures according to a solution heat treatment, a quenching of a resulting product form, and an annealing treatment.