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AWS BVAg-31 vs. AWS BAu-4

Both AWS BVAg-31 and AWS BAu-4 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition.

For each property being compared, the top bar is AWS BVAg-31 and the bottom bar is AWS BAu-4.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 90
110
Poisson's Ratio 0.36
0.4
Shear Modulus, GPa 33
41
Tensile Strength: Ultimate (UTS), MPa 180
200

Thermal Properties

Brazing Temperature, °C 850 to 890
950 to 1000
Latent Heat of Fusion, J/g 150
100
Melting Completion (Liquidus), °C 850
950
Melting Onset (Solidus), °C 820
950
Specific Heat Capacity, J/kg-K 280
190
Thermal Expansion, µm/m-K 18
14

Otherwise Unclassified Properties

Density, g/cm3 10
17

Common Calculations

Stiffness to Weight: Axial, points 4.9
3.6
Stiffness to Weight: Bending, points 15
9.3
Strength to Weight: Axial, points 4.9
3.2
Strength to Weight: Bending, points 7.0
4.4
Thermal Shock Resistance, points 7.8
9.2

Alloy Composition

Cadmium (Cd), % 0 to 0.0010
0
Carbon (C), % 0 to 0.0050
0
Copper (Cu), % 31 to 33
0
Gold (Au), % 0
81.5 to 82.5
Lead (Pb), % 0 to 0.0020
0
Nickel (Ni), % 0
17.4 to 18.5
Palladium (Pd), % 8.0 to 12
0
Phosphorus (P), % 0 to 0.0020
0
Silver (Ag), % 57 to 59
0
Zinc (Zn), % 0 to 0.0010
0
Residuals, % 0
0 to 0.15