Precious Metal AuCo5 vs AuNi5
Precious Metal · grade comparison
Precious Metal AuCo5 and AuNi5 are both precious metal grades. AuCo5 is the stronger of the two: yield strength 650 MPa (94.3 ksi) against 610 MPa (88.5 ksi) for AuNi5, about 7% more; tensile strength follows at 750 MPa (109 ksi) vs 700 MPa (102 ksi). AuNi5 is stiffer (105 GPa vs 95 GPa). On the shop floor, AuCo5 welds better (very good vs good).
AuCo5Choose it when strength drives the design, or when it will be welded.
AuCo5 vs AuNi5: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all precious metal grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all precious metal grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Shear Strength
Fatigue Strength (Endurance Limit)
Same in both: Elongation at Break 3% · Hardness, Vickers 200 HV
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Latent Heat of Fusion
Min Service Temperature
Same in both: Specific Heat Capacity 140 J/kg·K0.03 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 14.3 µm/m·K7.9 µin/in·°F · Max Service Temperature (continuous) 200°C392 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Same in both: Machinability Rating (AISI 1212 = 100 %) 30%
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every precious metal grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | AuCo5 | AuNi5 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
AuCo5 vs AuNi5 — frequently asked
Is AuCo5 stronger than AuNi5?
Yes. AuCo5 has a typical yield strength of 650 MPa (94.3 ksi) against 610 MPa (88.5 ksi) for AuNi5 — about 7% more. Tensile strength is 750 MPa (109 ksi) vs 700 MPa (102 ksi).
Which is cheaper, AuCo5 or AuNi5?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, AuCo5 or AuNi5?
AuCo5, by a small margin. Both rate fair for machinability — 45/100 against 40/100 for AuNi5; for welding the order is AuCo5 first (very good, 70/100) then AuNi5 (good, 60/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in AuCo5 and AuNi5 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.