Sains Malaysiana 31: 93-100 (2002) Sains Fizis dan Gunaan /
Physical and Applied Sciences
Simulation of Thermodynamic Aspects
of AI-Si Binary System
Saheb Nouari, Abdul Razak Daud, Redzuwan Yahya
& Shahidan Radiman
School of Applied Physics
Faculty of Science and Technology
Universiti Kebangsaan Malaysia
43600 UKM Bangi, Selangor D.E, Malaysia
ABSTRACT
It is possible to perform a thermodynamic analysis to a system by using thermodynamic models for the Gibbs energy of individual phases. As a result a thermodynamic data can be created for each system. The models are phenomenological involving empirical parameters which could be defined or estimated from experimental information. Once the Gibbs energy functions of phases in the system have been obtained, many thermodynamic properties may be calculated by applying standard thermodynamic relations. In the present study Thermo-Calc software was used for plotting the phase diagram of the Al-Si binary system and other property diagrams. A simulation of solidification process was also highlighted.
ABSTRAK
Analisis termodinamik boleh dilakukan pada sesuatu sistem dengan menggunakan model termodinamik bagi tenaga Gibbs fasa-fasa tertentu. Data termodinamik dapat diwujudkan bagi setiap sistem melalui hasil analisis ini. Model-model termodinamik menggambarkan fenomena yang dikaitkan dengan parameter empirik yang boleh ditakrif atau dianggar berdasarkan maklumat uji kaji. Apabila fungsi tenaga Gibbs bagi fasa-fasa dalam sistem diperolehi sifat-sifat termodinamik boleh dikira dengan menggunakan persamaan-persamaan termodinamik piawai. Dalam kajian ini perisian Thermo-Calc telah digunakan bagi melakar gambarajah fasa untuk sistem biner Al-Si dan gambarajah-gambarajah sifat yang lain. Simulasi bagi proses pemejalan juga dikemukakan.
RUJUKAN/REFERENCES
Anderson, J.O., Guillermet A.F., Hillert M., Janson B., & Sundman B. 1986. A compound-energy model of ordering in a phase with sites of different coordination numbers. Acta. Met. 34: 437-445.
Dinsdale A. 1991. SGTE data for pure elements. CALPHAD 15: 317-425.
Inden G. 1976. Project Meeting Calphard V. Dusseldorf, Germany. Max Planck Institute.
Kaufman L. & Bernstein H. 1970. Computer Calculation of Phase Diagrams. York: Academic Press.
Sundman B. 1990. Review of alloys modeling. Anales de Fisica Serie B 86: 69-82.
Sundman B.1998. Thermo-Cale Software Version M Division of Computational Thermodynamics. Stockholm: Royal Institute of Technology.
Sundman B & Agren J. 1981. A regular solution model for phases with several components and sublattices, suitable for computer applications. J. Phys. Chem. Sol. 42: 297-301.
|