NIST Home Page MML Home Page Navigational links also at page bottom

Phase Diagrams & Computational Thermodynamics

Phase Diagram Logo

Cu-Sn System


Calculated Phase Diagram

Calculated Cu-Sn Phase Diagram (percent of mass fraction) (101 KB)


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 72.68 27.32
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



Materials Science and Engineering Division | metallurgy@nist.gov
Home | Personnel | Research Opportunities


The National Institute of Standards and Technology (NIST) is an agency of the U.S. Commerce Department.
Privacy policy / security notice / accessibility statement / Disclaimer / Freedom of Information Act (FOIA) / No Fear Act Policy /
ExpectMore.gov (performance of federal programs) / NIST Information Quality Standards
Last modified: by Metallurgy Webmeister