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AWS BAu-3 vs. ASTM B780 Alloy

Both AWS BAu-3 and ASTM B780 alloy are otherwise unclassified metals. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 13 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AWS BAu-3 and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
83
Poisson's Ratio 0.37
0.36
Shear Modulus, GPa 41
30
Tensile Strength: Ultimate (UTS), MPa 220
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 160
140
Specific Heat Capacity, J/kg-K 300
270
Thermal Expansion, µm/m-K 16
18

Otherwise Unclassified Properties

Density, g/cm3 13
10

Common Calculations

Stiffness to Weight: Axial, points 5.0
4.5
Stiffness to Weight: Bending, points 13
14
Strength to Weight: Axial, points 4.9
9.1 to 16
Strength to Weight: Bending, points 6.4
11 to 15
Thermal Shock Resistance, points 8.7
16 to 29

Alloy Composition


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Cadmium (Cd), % 0
0 to 0.050
Copper (Cu), % 60.9 to 63
23.5 to 25.7
Gold (Au), % 34.5 to 35.5
0
Iron (Fe), % 0
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Nickel (Ni), % 2.5 to 3.5
0.35 to 0.65
Silver (Ag), % 0
74 to 76
Zinc (Zn), % 0
0 to 0.060
Residuals, % 0 to 0.15
0