Thermodynamic Reassessment of the Cu-Ni-Sn System Adéla Zemanová and Aleš Kroupa Institute of...
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Transcript of Thermodynamic Reassessment of the Cu-Ni-Sn System Adéla Zemanová and Aleš Kroupa Institute of...
Thermodynamic Reassessment of the Cu-Ni-Sn System
Adéla Zemanová and Aleš Kroupa
Institute of Physics of MaterialsAcademy of Sciences of Czech Republic Žizkova 22, 616 62 Brno Czech Republic
X.J. Liu, H.S. Liu, I. Ohnuma, R. Kainuma, K. Ishida, S. Itabashi, K.
Kameda and K.Yamaguchi: J. Electron. Mater., Vol. 30 (2001), p.
1093
The Cu-Sn Binary System
J. Miettinen: CALPHAD, Vol. 27 (2003), p. 309
• FCC_A1 and LIQUID phase data were modified to take into account new experimental data obtained in the scope of COST 531
Action γ(D03)/(A2) two-phase equilibrium
H.S. Liu, J. Wang and Z.P. Jin: CALPHAD, Vol. 28 (2004), p. 363
The Ni-Sn Binary System
• Ni3Sn phase (D03 structure) - has been modelled as BCC_A2 phase in the COST 531 database for compatibility with Cu-Sn system
• Ni3Sn2 phase – remodelled to make it compatible with the Au-Ni-Sn assessment - 3-sublattice model: (Ni,Sn)0.5(Ni)0.25(Ni)0.25
The reassessment of the Cu-Ni-Sn Ternary System
• based on the work - Miettinen [J. Miettinen: CALPHAD, Vol. 27 (2003), p. 309] - Wang et. al. [C.H. Wang and S.W. Chen: Mater. Trans. A.,
Vol. 34A (2003), p. 2281] - Pool [ M.J. Pool, I. Arpshofen, B. Predel and E.
Schultheiss: Z. Metallkd., Vol. 70 (1979), p. 656 ] - experimental results obtained as part of the COST
531 programme
Why the new reassessment ?
1. different unary data [Version 4.4 of the SGTE Unary database] 2. different descriptions of the relevant binary systems
3. the high-temperature Ni3Sn- phase was modelled as BCC_A2 to correspond
to the model used in Cu-Sn system
The calculated enthalpy of mixing in liquid Cu-Ni-Sn alloys at 1580 K
together with experimental data points [*]
[*] M.J. Pool, I. Arpshofen, B. Predel and E. Schultheiss: Z. Metallkd., Vol. 70 (1979), p. 656
The calculated isothermal section at 600 °C together with experimental data [*]
[*] H. Flandorfer and H. Ipser: private communication
Sn
NiCu
L
BCC_A2
Ni Sn3 2
Ni Sn_LT3
FCC_A1
Cu Ni Sn3 27 10
Cu Sn3
Ni Sn3 4
Cu Sn10 3
full symbols – full agreement betweenthe calculation and experimentally obtained phase equilibria blank symbols – disagreement of calculation with experiment
Exp. results: - single phase equilibrium; - two-phase equilibrium;
- three-phase equilibrium.
Sn
NiCu
L
FCC_A1
Ni Sn3 2
Ni Sn_LT3
BCC_A2
[*] C.H. Wang and S.W. Chen: Mater. Trans. A., Vol. 34A (2003), p. 2281
full symbols – full agreement betweenthe calculation and experimentally obtained phase equilibria blank symbols – disagreement of calculation with experiment
Exp. results: - single phase equilibrium; - two-phase equilibrium;
- three-phase equilibrium.
The calculated isothermal section at 800 °C together with experimental data [*]
The calculated isopleths at 2, 4 and 15 wt% Ni in the copper-rich part of the Cu-Ni-Sn system
together with experimental data
FCC_A1
L
BCC_A2
BCC_A2+Cu Sn3
2 wt% Ni
15 wt% Ni
L
FCC_A1
BC
C_
A2
4 wt% Ni
FCC_A1
BCC_A2
FCC_A1+Cu Sn3
L
J. Veszelka: Mitt. Berg-Hüttemänn (Abt. Ung. Hochschule Berg-Forstw., Sopron,1932).
The calculated isopleth at xSn = 0.25 in the Cu-Ni-Sn system together with experimental data points
E. Wachtel and E. Bayer: Z. Metallkd., Vol. 75 (1984), p. 205 J.S.L. Pak, K. Mukherjee, O.T. Inal and H.R. Pak: Mater. Sci. Eng., Vol. A117 (1989), p. 167
x = 0.25Sn L
BCC_A2
[12][ ]13
Cu Sn+Ni Sn
3
3 2 Cu Sn+Ni Sn+BCC_A2
3 3 2
BCC_A2+FCC_A1
BCC_A2+Ni Sn_LT3
Cu Ni Sn+FCC_A1+Ni Sn_LT
3 27 10
3
Cu Sn+BCC_A2(very narrow region)
3
• the high temperature form of Ni3Sn phase in the Ni-Sn binary system was remodelled as BCC_A2 for compatibility with Cu-Sn binary system
• very good agreement was reached with respect to the existing experimental data and previous description of this phase in binary system
• a thermodynamic description was optimized for the Cu-Ni-Sn ternary system by applying the experimentally measured mixing enthalpy in liquid and experimental phase equilibrium data from the literature
• the good agreement was obtained between calculated and experimental phase equilibria data and thermodynamic properties
Conclusion