Binary Phase Diagrams: Au-Cu
Key invariant points and phase boundary data for important binary alloy systems. Covers 10 systems: Fe-C (iron-carbon), Al-Si, Al-Cu, Cu-Zn (brass), Cu-Sn (tin bronze), Pb-Sn (solder), Ni-Cu (complete solid solution), Ti-Al (titanium aluminides), Mg-Al, and Au-Cu. Includes eutectic and eutectoid compositions and temperatures, peritectic reactions, phase solubility limits, solidus/liquidus temperatures, phase names, and engineering significance. Data per ASM Binary Alloy Phase Diagrams 2nd Ed and standard materials science references.
| alloy system | invariant point or boundary | component 1 name | component 2 name | composition 1 wt pct (wt%) | engineering significance | notes | phase alpha | phase beta | phase description | reaction type | temperature C (C) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Au-Cu | AuCu3_ordered_phase | Cu | Au | 75 | AuCu3 is model system for study of order-disorder transformations | Long-range order provides hardening; studied extensively for electronic applications | AuCu3_ordered | AuCu3_disordered | Order-disorder transition in Au-Cu at 75 at%Cu (AuCu3 cubic L12 structure) at 240°C | phase_boundary | 240 |
| Au-Cu | AuCu_ordered_phase | Cu | Au | 50 | Au-Cu alloys used in dental and electronics; ordered phase is harder and less conductive | Dental gold alloys exploit Au-Cu-Ag system; AuCu shows significant superlattice ordering | AuCu_I_ordered | AuCu_disordered | Order-disorder transition in Au-Cu at 50 at%Cu (AuCu I tetragonal ordered structure) at 390°C | phase_boundary | 390 |
| Au-Cu | eutectic_like_minimum | Cu | Au | 20 | Au-Cu has no eutectic; minimum liquidus at ~20%Cu around 1000°C | Au melts at 1064°C; Cu at 1085°C; minimum liquidus between the two due to interactions | solid_FCC | liquid | Near-minimum in liquidus curve at ~20 at%Cu (~1000°C); Au-Cu has complete solid solution | liquidus_minimum | 1,000 |
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