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CHEMICAL COMPOSITION Al: 2.5-3.5%; Zn: 0.7-1.3%; Mn: 0.20 – 1.0%; Mg: Balance PHYSICAL PROPERTIES Density: 1.78; Coefficient of thermal expansion: 26.8 x 10-6K-1 Specific heat: 1040 Jkg-1k-1 Thermal ...