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7108 Aluminum vs. ASTM B477 Au-Ni-Ag

7108 aluminum belongs to the aluminum alloys classification, while ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals. There are 19 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 7108 aluminum and the bottom bar is ASTM B477 Au-Ni-Ag.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
95
Elongation at Break, % 11
5.5 to 11
Poisson's Ratio 0.33
0.41
Shear Modulus, GPa 26
34
Shear Strength, MPa 210
190 to 320
Tensile Strength: Ultimate (UTS), MPa 350
310 to 550

Thermal Properties

Latent Heat of Fusion, J/g 380
80
Melting Completion (Liquidus), °C 630
1010
Melting Onset (Solidus), °C 530
930
Specific Heat Capacity, J/kg-K 880
160
Thermal Expansion, µm/m-K 24
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
14
Electrical Conductivity: Equal Weight (Specific), % IACS 120
7.5

Otherwise Unclassified Properties

Density, g/cm3 2.9
17

Common Calculations

Stiffness to Weight: Axial, points 13
3.1
Stiffness to Weight: Bending, points 47
8.9
Strength to Weight: Axial, points 34
5.0 to 9.0
Strength to Weight: Bending, points 38
6.0 to 8.8
Thermal Shock Resistance, points 16
16 to 28

Alloy Composition

Aluminum (Al), % 92.4 to 94.7
0
Copper (Cu), % 0 to 0.050
0
Gold (Au), % 0
74.2 to 75.8
Iron (Fe), % 0 to 0.1
0
Magnesium (Mg), % 0.7 to 1.4
0
Manganese (Mn), % 0 to 0.050
0
Nickel (Ni), % 0
2.6 to 3.4
Silicon (Si), % 0 to 0.1
0
Silver (Ag), % 0
21.4 to 22.6
Titanium (Ti), % 0 to 0.050
0
Zinc (Zn), % 4.5 to 5.5
0
Zirconium (Zr), % 0.12 to 0.25
0
Residuals, % 0
0 to 0.3