Binary Phase Diagrams: Ti-Al
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) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ti-Al | alpha2_boundary | Al | Ti | 25 | Ti3Al intermetallic has high strength at elevated temperature but limited ductility | Basis for alpha2 titanium aluminide alloys (Ti-25Al-10Nb-3V-1Mo) | alpha2_Ti3Al | alpha_HCP | Alpha2 (Ti3Al) phase boundary at ~25 at%Al; ordered hexagonal DO19 structure | phase_boundary | 1,170 |
| Ti-Al | beta_transus_pure_Ti | Al | Ti | 0 | Basis for all Ti alloy processing; alpha stabilizers (Al, O, N) raise beta transus; beta stabilizers (V, Mo) lower it | Ti-6Al-4V beta transus ~995°C; determines annealing and solution temperatures | alpha_HCP | beta_BCC | Pure titanium beta transus: HCP alpha <-> BCC beta at 882°C | phase_boundary | 882 |
| Ti-Al | gamma_boundary_high | Al | Ti | 66 | Gamma TiAl + Al3Ti two-phase region; higher Al reduces ductility further | Al3Ti has tetragonal DO22 structure; used in oxidation-resistant coatings | gamma_TiAl | Al3Ti | Upper boundary of gamma (TiAl) phase field at 66 at%Al; adjacent to Al3Ti | phase_boundary | 1,340 |
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