Binary Phase Diagrams: Al-Si
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) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Al-Si | eutectic | Si | Al | 12.6 | Most common die-cast and sand-cast Al alloy compositions near this point; A380/ADC12 alloys | Sr modification refines eutectic to fibrous morphology; eutectic point sometimes cited as 12.5–12.6%Si | alpha_Al | silicon | Liquid -> alpha-Al + silicon; fine lamellar or fibrous eutectic microstructure | eutectic | 577 |
| Al-Si | hypereutectic_boundary | Si | Al | 12.6 | Hypereutectic alloys (>12.6%Si) contain coarse primary Si particles; require P modification for refinement | Hypereutectic alloys A390 (17%Si) used for automotive engine blocks | alpha_Al | primary_Si | Boundary between eutectic and hypereutectic compositions | phase_boundary | 577 |
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