Thermodynamic Database of the Phase Diagrams in the Sc-X Binary Systems

Abstract:

Sc-based alloys have been used as aero-structures materials, and Sc addition on wrought alloys has positive effects on weldability and welding properties. Phase diagrams play an effective role during the development of new type of alloy with good properties. Therefore, to establish the thermodynamic database of Sc-X binary systems is important and necessary.In the present work, the thermodynamic assessments of Sc-X (Ag, B, Cr, Er, Gd, Mo, Th, W, Y, Zr) binary systems was carried out by using CALPHAD (Calculation of Phase Diagrams) method based on the experimental data including thermodynamic properties and phase equilibria. The Gibbs free energies of the solution phases were described by the sub-regular solution model with the Redlich-Kister equation, and those of the intermetallic compounds were described by the sub-lattice model. A set of self-consistent thermodynamic parameters were derived for describing the Gibbs free energies of each solution phase and intermetallic compound. The calculated phase diagrams and thermodynamic properties are in good agreement with experimental data. The thermodynamic database of the Sc-X (Al, Ag, B, Ca, Co, Cr, Cu, Er, Fe, Ga, Gd, Ge, La, Li, Mg, Mn, Mo, Ni, Pb, Pd, Ru, Sn, Th, W, Y, Zn, Zr) binary systems have been developed, which can provide much important thermodynamic information for multicomponent Al-Sc based alloys.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 439-443
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.439
• Online since: March 2016
• Authors: Jia Lian Li, Shu Liang Wang*, Xue Qin, Yu Heng Li, Lu Jiang Zhou, Yuan Hua Lin, Xing Jun Liu
• Keywords: CALPHAD, Phase Diagram, Sc-X Binary Systems, Thermodynamic Database

References

[1] S. Costa, H. Puga, J. Barbosa, A.M.P. Pinto, The effect of Sc additions on the microstru- cture and age hardening behavior of as cast Al-Sc alloys, Mater. Design. 42 (2012) 347-352.

DOI: 10.1016/j.matdes.2012.06.019

[2] N.Q. Vo, D.C. Dunand, D.N. Seidman, Improving aging and creep resistance in a dilute Al–Sc alloy by microalloying with Si, Zr and Er, Acta Mater. 63 (2014) 73-85.

DOI: 10.1016/j.actamat.2013.10.008

[3] J.O. Andersson, T. Helander, L. Höglund, P. Shi, B. Sundman, Thermo-Calc & Dictra, computational tools for materials science, Calphad. 26(2002) 273-312.

DOI: 10.1016/s0364-5916(02)00037-8

[4] O. Redlich, A.T. Kister, Algebraic representation of thermodynamic properties and the classification of solutions, Ind. Eng. Chem. 40 (1948) 345-348.

DOI: 10.1021/ie50458a036

[5] M. Hillert, L.I. Staffansson, The Regular Solution Model for Stoichiometric Phases and Ionic Melts, Acta Chem. Scand. 24 (1970) 3618-3626.

DOI: 10.3891/acta.chem.scand.24-3618

[6] X.J. Liu, S.L. Wang, C.P. Wang, Thermodynamic assessments of the Sc-M (M: Ag, B, and Th) systems, J. Alloy. Compd. 469 (2009) 186-192.

[7] S.L. Wang, L.J. Zhou, Y. Ye, X.H. Wang, Y.H. Lin, C.P. Wang, X.J. Liu, Thermodynamic Assessments of the Sc-M (M: Cr, Gd, Mo, W and Zr) Systems. J. Phase Equilib Diff. 36 (2015) 3-9.

DOI: 10.1007/s11669-014-0340-8

[8] S.L. Wang, C.P. Wang, X.J. Liu, K. Ishida, Thermodynamic assessments of the Ag-Y and Sc-Y systems, J. Alloy. Compd. 476 (2009) 187-192.

[9] K.A. Gschneidner, O.D. McMasters, D.G. Alexander, R. F Venteicher, Factors influencing the formation of silver-rich solid solutions in rare-earth-silver alloy systems, Metall. Trans. 1 (1970) 1961-(1971).

DOI: 10.1007/bf02642796

[10] I. Stapf, G. Kiessler, E. Gebhardt. Das system Silber-Scandium, J. Less-Common Met. 39 (1975) 219-225.

DOI: 10.1016/0022-5088(75)90196-4

[11] G.I. Terekhov, S.I. Sinyakova, The Th-Sc Phase Diagram, Izv. Akad. Nauk SSSR, Met. 3 (1990) 215-218.

[12] T.A. Badayeva, P.I. Kuznetsova, Nature of the Interactions between Thorium and Rare-Earth Elements, Russ. Metall. 5 (1969) 101-106.

[13] O.P. Naumkin, V.F. Terekhova, E.M. Savitskii. Zh. Neorg. Khim., 1964, 9: 2497-2498; TR: Russ. J. Inorg. Chem., 1964, 9: 1347-1349.

[14] Jr.K.A. Gschneidner, F.W. Calderwood. Bull. Alloy Phase Dragrams, 1983, 4 (1): 75-77.

[15] V.M. Svechnikov, G.F. Kobzenko, V.G. Ivanchenko, Phase Diagram of the Chromium -Scandium System, Dopo. Akad. Nauk Ukr. RSR, 34 (1972) 266-268.

[16] F.R. de Boer, D.G. Pettifor, Cohesion in Metals, Elsevier Science Publishers B. V, Netherlands, (1988).