Binary Phase Diagrams: Cu-Zn
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) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Cu-Zn | alpha_beta_boundary_high_T | Zn | Cu | 37 | Compositions below 37%Zn are single-phase alpha brasses (cartridge brass C26000 at 30%Zn) | Single-phase alpha brass: excellent cold formability; ductile; C22000 (10%Zn) to C27000 (35%Zn) | alpha_FCC | beta_BCC | Alpha (FCC) to alpha+beta boundary at 903°C (upper critical) | phase_boundary | 903 |
| Cu-Zn | alpha_beta_boundary_room_T | Zn | Cu | 32.5 | Alloys with >32.5%Zn at room temperature are alpha-beta or beta brasses | Beta prime (ordered BCC) forms below ~468°C from beta | alpha_FCC | beta_prime_BCC | Alpha solvus at room temperature; boundary between single-phase and two-phase region | phase_boundary | 25 |
| Cu-Zn | alpha_beta_two_phase | Zn | Cu | 46 | Compositions 37–46%Zn at 903°C are alpha-beta brasses (Muntz metal C28000 at 40%Zn) | Alpha-beta brasses: stronger than alpha; hot-workable; used for hot-stamped parts | alpha_FCC | beta_BCC | Upper beta boundary at 903°C; two-phase alpha-beta field | phase_boundary | 903 |
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