Binary Phase Diagrams: Ni-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 description | reaction type | temperature C (C) |
|---|---|---|---|---|---|---|---|---|---|---|
| Ni-Cu | liquidus_50Ni | Ni | Cu | 50 | Cu-Ni is textbook isomorphous system; no eutectic or intermediate phases | Commercial Monel 400 (67%Ni): liquidus ~1340°C; solidus ~1300°C | liquid | Liquidus temperature at 50%Ni composition in complete solid solution system | liquidus | 1,318 |
| Ni-Cu | liquidus_pure_Ni | Ni | Cu | 100 | Reference for Ni-Cu liquidus calculation | Ni melts at 1455°C; FCC crystal structure; magnetic below 358°C (Curie temp) | liquid | Pure nickel melting point; top of liquidus curve | liquidus | 1,455 |
| Ni-Cu | solidus_50Ni | Ni | Cu | 50 | Complete miscibility enables wide alloy range; segregation during solidification is main concern | Liquidus-solidus gap (~50K at 50%Ni) causes Ni-rich dendrite cores with Cu-rich interdendritic regions | solid_FCC | Solidus temperature at 50%Ni (complete solid solution - FCC throughout) | solidus | 1,268 |
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