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Phase Diagrams & Computational Thermodynamics
Cu-Sn System
Calculated Phase Diagram
Status of the thermodynamic description:
J.-H. Shim, C.-S. Oh, B.-J. Lee and D.N. Lee, Z. Metallkde. 87 (1996) 205-212:Full thermodynamic assessment.
Additional Assessments:
W.J. Boettinger, C.A. Handwerker and U.R. Kattner, "Reactive Wetting and Intermetallic Formation," in "The Mechanics of Solder Alloy Wetting and Spreading,", Eds. F.G. Yost, F.M. Hosking and D.R. Frear, Van Nostrand Reinhold, New York, NY, USA, 1993, 103-140. (Cu-rich intermetallic phases not included).Calculated Invariant Equilibria
| Reaction | Phase | Mass % Cu | Mass % Sn |
|---|---|---|---|
| L + (Cu) -> beta
796.0 oC |
Liquid | 73.25 | 26.75 |
| (Cu) | 85.70 | 14.30 | |
| beta | 78.91 | 21.09 | |
| L + beta -> gamma
756.5 oC |
Liquid | 66.87 | 33.13 |
| beta | 74.99 | 25.01 | |
| gamma | 72.78 | 27.22 | |
| gamma -> L + Cu3Sn
638.4 oC |
gamma | 57.74 | 43.26 |
| Liquid | 42.05 | 57.95 | |
| Cu3Sn | 61.63 | 38.37 | |
| L + Cu3Sn -> Cu6Sn5
415.0 oC |
Liquid | 13.07 | 86.93 |
| Cu3Sn | 61.63 | 38.37 | |
| Cu6Sn5 | 39.07 | 60.93 | |
| L -> Cu6Sn5 + (Sn)
226.8 oC |
Liquid | 0.89 | 99.11 |
| Cu6Sn5 | 39.07 | 60.93 | |
| (Sn) | 0.01 | 99.99 | |
| beta -> (Cu) + gamma
585.9 oC |
beta | 76.12 | 23.88 |
| (Cu) | 84.56 | 15.44 | |
| gamma | 73.94 | 26.06 | |
| gamma -> (Cu) + Cu41Sn11
518.7 oC |
gamma | 72.71 | 27.29 |
| (Cu) | 85.15 | 14.85 | |
| Cu41Sn11 | 66.56 | 33.44 | |
| gamma + Cu3Sn -> Cu10Sn3
640.1 oC |
gamma | 65.95 | 34.05 |
| Cu3Sn | 61.63 | 38.37 | |
| Cu10Sn3 | 64.06 | 35.94 | |
| gamma + Cu10Sn3 -> Cu41Sn11
590.0 oC |
gamma | 68.56 | 31.44 |
| Cu10Sn3 | 64.06 | 35.94 | |
| Cu41Sn11 | 66.56 | 33.44 | |
| Cu10Sn3 -> Cu41Sn11 + Cu3Sn
582.5 oC |
Cu10Sn3 | 64.06 | 35.94 |
| Cu41Sn11 | 66.56 | 33.44 | |
| Cu3Sn | 61.63 | 38.37 | |
| Cu41Sn11 -> (Cu) + Cu3Sn
348.1 oC |
Cu41Sn11 | 66.56 | 33.44 |
| (Cu) | 90.36 | 9.64 | |
| Cu3Sn | 61.63 | 38.37 | |
| gamma -> Cu3Sn
677.0 oC |
congruent point | 61.63 | 38.37 |
| Cu6Sn5 -> Cu6Sn5'
187.5 oC |
allotropic transformation | 39.07 | 60.93 |
Phases, Crystal Structures and Model Descriptions
| Phase | Struktur- bericht Symbol |
Common Names | Prototype | Spacegroup | Model* |
|---|---|---|---|---|---|
| Liquid | n/a | L | n/a | n/a | (Cu,Sn)1 |
| Fcc | A1 | (Cu) | Cu | Fm-3m | (Cu,Sn)1(Va)1 |
| Bcc | A2 | (beta Cu), beta | W | Im-3m | (Cu,Sn)1(Va)3 |
| Bct | A5 | (Sn), (beta Sn) | beta Sn | I41/amd | (Cu,Sn)1 |
| Cu3Sn.h | D03 | gamma | BiF3 | Fm-3m | (Cu,Sn)0.75(Cu,Sn)0.25 |
| Cu41Sn11 | ... | delta | ... | F-43m | Cu0.788Sn0.212 |
| Cu10Sn3 | ... | zeta | ... | P63 | Cu0.769Sn0.231 |
| Cu3Sn | ... | epsilon | ... | Cmcm | Cu0.75Sn0.25 |
| Cu6Sn5 | B81 | eta, Cu6Sn5.h | NiAs | P63/mmc | Cu0.545Sn0.455 |
| Cu6Sn5' | ... | eta ', Cu6Sn5.l | ... | ... | Cu0.545Sn0.455 |
*Major species are printed bold face