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AWS BAu-1 vs. AWS BAu-5

Both AWS BAu-1 and AWS BAu-5 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much.

For each property being compared, the top bar is AWS BAu-1 and the bottom bar is AWS BAu-5.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
140
Poisson's Ratio 0.37
0.37
Shear Modulus, GPa 40
50
Tensile Strength: Ultimate (UTS), MPa 210
210

Thermal Properties

Brazing Temperature, °C 1020 to 1090
1170 to 1230
Latent Heat of Fusion, J/g 150
180
Melting Completion (Liquidus), °C 1020
1170
Melting Onset (Solidus), °C 990
1140
Specific Heat Capacity, J/kg-K 290
280
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Density, g/cm3 13
13

Common Calculations

Stiffness to Weight: Axial, points 4.7
5.8
Stiffness to Weight: Bending, points 12
13
Strength to Weight: Axial, points 4.5
4.5
Strength to Weight: Bending, points 6.1
6.0
Thermal Shock Resistance, points 8.5
9.0

Alloy Composition


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Copper (Cu), % 61.9 to 63
0
Gold (Au), % 37 to 38
29.5 to 30.5
Nickel (Ni), % 0
35.5 to 36.4
Palladium (Pd), % 0
33.5 to 34.5
Residuals, % 0 to 0.15
0 to 0.15