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AWS BAu-1 vs. ASTM B522 Class I

Both AWS BAu-1 and ASTM B522 class I are otherwise unclassified metals. They have a modest 38% of their average alloy composition in common, which, by itself, doesn't mean much. There are 15 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is AWS BAu-1 and the bottom bar is ASTM B522 class I.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
96
Poisson's Ratio 0.37
0.41
Shear Modulus, GPa 40
34
Tensile Strength: Ultimate (UTS), MPa 210
280 to 490

Thermal Properties

Latent Heat of Fusion, J/g 150
77
Melting Completion (Liquidus), °C 1020
1030
Melting Onset (Solidus), °C 990
1030
Specific Heat Capacity, J/kg-K 290
160
Thermal Expansion, µm/m-K 16
15

Otherwise Unclassified Properties

Density, g/cm3 13
17

Common Calculations

Stiffness to Weight: Axial, points 4.7
3.1
Stiffness to Weight: Bending, points 12
8.9
Strength to Weight: Axial, points 4.5
4.4 to 7.8
Strength to Weight: Bending, points 6.1
5.5 to 8.0
Thermal Shock Resistance, points 8.5
13 to 24

Alloy Composition

Copper (Cu), % 61.9 to 63
0
Gold (Au), % 37 to 38
68 to 70
Platinum (Pt), % 0
5.0 to 7.0
Silver (Ag), % 0
23.5 to 26.5
Residuals, % 0 to 0.15
0 to 0.35