Binary Phase Diagrams: Fe-C
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 | engineering significance | notes | phase alpha | phase beta | phase description | reaction type | temperature C (C) |
|---|---|---|---|---|---|---|---|---|
| Fe-C | A1_eutectoid_temperature | Must heat above A1 to austenitize steel for hardening; tempering occurs below A1 | A1 temperature is essentially constant at 727°C regardless of carbon content | ferrite | cementite | Lower critical temperature; austenite decomposes below this in steels | phase_boundary | 727 |
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