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Wrought aluminum-zinc-magnesium alloy 7178

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Wrought aluminum-zinc-magnesium alloy 7178
Chemical composition: Cu=2.0%, Mg=2.8%, Cr=0.26% Zn=6.8%, Al balance
Property Value in metric unit Value in US unit
Density 2.83 *10³ kg/m³ 177 lb/ft³
Modulus of elasticity 72 GPa 10400 ksi
Thermal expansion (20 ºC) 23.4*10-6 ºCˉ¹ 13.0*10-6 in/(in* ºF)
Specific heat capacity 856 J/(kg*K) 0.205 BTU/(lb*ºF)
Thermal conductivity 150 W/(m*K) 1040 BTU*in/(hr*ft²*ºF)
Electric resistivity 4.6*10-8 Ohm*m 4.6*10-6 Ohm*cm
Tensile strength (annealed) 228 MPa 33000 psi
Yield strength (annealed) 103 MPa 15000 psi
Elongation (annealed) 15 % 15 %
Shear strength (annealed) 150 MPa 21800 psi
Hardness (annealed) 60 HB 60 HB
Tensile strength (T6, T651) 607 MPa 88000 psi
Yield strength (T6, T651) 538 MPa 78000 psi
Elongation (T6, T651) 10 % 10 %
Shear strength (T6, T651) 360 MPa 52200 psi
Fatigue strength (T6, T651) 150 MPa 21800 psi
Hardness (T6, T651) 160 HB 160 HB
Annealing temperature 413 ºC 775 ºF
Solution temperature 468 ºC 875 ºF
Aging temperature 121 ºC 250 ºF

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