A Thermodynamic Description of the Al-Fe-Si System over the Entire Composition and Temperature Ranges
105 alloys having compositions distributed over the entire composition range of the Al-Fe-Si system were equilibrated at temperatures ranging from 550℃ (Al rich alloys) to 900℃ (Fe-Si rich alloys) and characterized using XRD, EDT, and DTA. DTA heating curve data were used to derive the Schultz-Scheil scheme linking the observed solid state equilibria with the liquid phase. Combined with observations regarding the primary phases crystallizing a projection of the liquidus surface is proposed.A thermodynamic modeling for the Al-Fe-Si system is then conducted. All of the experimental phase diagram and thermodynamic data available from the literature are critically reviewed and assessed using thermodynamic models for the Gibbs energies of individual phases. The thermodynamic parameters for eleven ternary compounds (τ1-(Al,Si)5Fe3,τ2-(Al,Si)7Fe2, τ3-Al9Fe4Si3, τ4-(Al,Si)5Fe1, τ5-Al74Fe20Si10,τ6-Al9Fe2Si2,τ7-(Al,Si)3Fe1, τ8-(Al,Si)2Fe1,τ9(Al,Si)5Fe3, τ10-Al12Fe5Si3 and τ11-Al5Fe2Si), the ternary solution phases (liquid, bcc_A2, and bcc_B2) as well as the binary phases (FeSi, FeSi2, Al13Fe4, Al5Fe2 and Al2Fe) showing noticeablesolubilities for the third element are adjusted in the optimization. The order/disorder transition between disordered bcc_A2 and ordered bcc_B2 phases is treated using a two-sublattice model. Comprehensive comparisons show that the measured isothermal sections at 727℃ and 550℃, most of the observed primary phase regions and invariant reactions, as well as the thermodynamic data are satisfactorily accounted for by the thermodynamic description.
Y.Du N. Krendelsberger J.C. Schuster Z.-K Liu C.Y. Tang W. Xiong H.H. Xu
State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, P. R. ECHEM-Center of Competence in Applied Electrochemistry, A-2700 Wiener Neustadt, Austria Innovative Materials Design, Universitat Wien, Wahringerstrasse 42, A-1090 Wien, Austria Department of Materials Science and Engineering, Pennsylvania State University 209 Steidle Building,
国际会议
厦门
英文
149-152
2006-11-08（万方平台首次上网日期，不代表论文的发表时间）