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Wrought aluminum-zinc-magnesium alloy 7039

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Wrought aluminum-zinc-magnesium alloy 7039
Chemical composition: Mn=0.25%, Mg=2.8%, Cr=0.20%, Zn=4.0%, Al balance
Property Value in metric unit Value in US unit
Density 2.74 *10³ kg/m³ 171 lb/ft³
Modulus of elasticity 70 GPa 10100 ksi
Thermal expansion (20 ºC) 23.4*10-6 ºCˉ¹ 13.0*10-6 in/(in* ºF)
Specific heat capacity 880 J/(kg*K) 0.210 BTU/(lb*ºF)
Thermal conductivity 140 W/(m*K) 972 BTU*in/(hr*ft²*ºF)
Electric resistivity 4.5*10-8 Ohm*m 4.5*10-6 Ohm*cm
Tensile strength (annealed) 230 MPa 33400 psi
Yield strength (annealed) 100 MPa 14500 psi
Elongation (annealed) 22 % 22 %
Shear strength (annealed) 140 MPa 20300 psi
Hardness (annealed) 61 HB 61 HB
Tensile strength (T61) 400 MPa 58000 psi
Yield strength (T61) 330 MPa 47900 psi
Elongation (T61) 13 % 13 %
Shear strength (T61) 235 MPa 34100 psi
Fatigue strength (T61) 160 MPa 23200 psi
Hardness (T61) 123 HB 123 HB
Annealing temperature 413 ºC 775 ºF
Solution temperature 499 ºC 930 ºF

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