Patent ID: 7718118

Claim:
A magnesium-based creep resistant alloy with improved ductility and fracture toughness for low pressure casting and gravity casting of low density articles, consisting of: i) 96 wt % or more magnesium to balance components ii to viii to 100 wt %, ii) 1.5 to 1.9 wt % neodymium, iii) 0.10 to 0.30 wt % yttrium, iv) 0.35 to 0.70 wt % zirconium, v) 0.05 to 0.35 wt % zinc, vi) 0.01 to 0.10 wt % calcium vii) 0.01 to 0.15 wt % strontium, and viii) 0.000 to 0.0005 beryllium, wherein the alloy exhibits room temperature elongation to rupture not lower than 10%, impact strength not lower than 8J, and fracture toughness not lower than 21 MPa·m 0.5 , and wherein the alloy contains incidental impurities.