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ASTM B596 Au-Cu vs. ASTM B628 Ag-Cu

Both ASTM B596 Au-Cu and ASTM B628 Ag-Cu are otherwise unclassified metals.

For each property being compared, the top bar is ASTM B596 Au-Cu and the bottom bar is ASTM B628 Ag-Cu.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
83
Elongation at Break, % 4.3 to 17
1.1 to 17
Poisson's Ratio 0.41
0.36
Shear Modulus, GPa 36
31
Shear Strength, MPa 280 to 360
210 to 430
Tensile Strength: Ultimate (UTS), MPa 450 to 620
350 to 760

Thermal Properties

Latent Heat of Fusion, J/g 77
140
Melting Completion (Liquidus), °C 1060
780
Melting Onset (Solidus), °C 930
780
Specific Heat Capacity, J/kg-K 150
280
Thermal Expansion, µm/m-K 14
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
84
Electrical Conductivity: Equal Weight (Specific), % IACS 6.7
75

Otherwise Unclassified Properties

Density, g/cm3 18
10

Common Calculations

Stiffness to Weight: Axial, points 3.1
4.6
Stiffness to Weight: Bending, points 8.5
14
Strength to Weight: Axial, points 6.8 to 9.4
9.5 to 21
Strength to Weight: Bending, points 7.1 to 8.8
11 to 18
Thermal Shock Resistance, points 22 to 30
16 to 34

Alloy Composition


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Aluminum (Al), % 0
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Copper (Cu), % 9.0 to 11
26.6 to 29
Gold (Au), % 89 to 91
0
Iron (Fe), % 0
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Nickel (Ni), % 0
0 to 0.010
Phosphorus (P), % 0
0 to 0.030
Silver (Ag), % 0
71 to 73
Zinc (Zn), % 0
0 to 0.060
Residuals, % 0 to 0.4
0 to 0.21

Comparable Variants