Phase diagram (T vs C₀)
Liquidus
Solidus
TE Isotherm
Solvus
C₀: 30.0 wt% Sn | T: 250.0 °C
Solidification stage:
Homogeneous liquid
Thermodynamic state variables
Hypoeutectic alloy
wt% Sn
0% (Pb, 327 °C)
18.3% (αmax)
61.9% (CE)
97.8% (βmax)
100% (Sn, 232 °C)
°C
25 °C (Ambient)
183 °C (TE invariant)
350 °C (Molten)
Liquidus Tliq
261.2 °C
Eutectic TE
183.0 °C
Solvus Tsolv
142.5 °C
Metallographic microstructure (etched, 250×)
α (Dark etched Pb-rich)
β (Bright silvery Sn-rich)
Liquid melt
Scale: 50 µm |───|
Primary proeutectic α:
73.2%
Eutectic matrix (α+β):
26.8%
Microstructural status:
✓ 100% Space-filling geometry active
Quantitative lever-rule solver
2 Coexisting phases
Left phase (C₁)
18.3 wt%
Alloy composition (C₀)
30.0 wt%
Right phase (C₂)
45.7 wt%
| Thermodynamic phase | Composition | Total phase fraction | Microstructural form |
|---|