Thermodynamic Description of the Al-Mo and Al-Fe-Mo Systems
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Basic and Applied Research: Section I
Thermodynamic Description of the Al-Mo and Al-Fe-Mo Systems Zhenmin Du, Cuiping Guo, Changrong Li, and Weijing Zhang
(Submitted March 27, 2009; in revised form May 10, 2009) The Al-Mo and Al-Fe-Mo systems were critically assessed using the CALPHAD technique. The solution phases (liquid, fcc and bcc) were described by a substitutional solution model. The nonstoichiometric compound AlMo3 was described by a two-sublattice model (Al,Mo)(Al,Mo)3 in the Al-Mo binary system and (Al,Fe,Mo)(Al,Fe,Mo)3 in the Al-Fe-Mo ternary system. Other compounds Al63Mo37, Al8Mo3, Al3Mo, Al4Mo, Al17Mo4, Al22Mo5, Al12Mo and Al5Mo in the Al-Mo system were treated as stoichiometric compounds in the binary system and as line compounds Alm(Fe,Mo)n in the Al-Fe-Mo ternary system. The compounds l and Fe2Mo in the Fe-Mo system were treated as (Al,Fe)7Fe2(Fe,Mo)4 and (Fe,Mo)2(Al,Mo) in the Al-Fe-Mo system, respectively. Compounds Al5Fe4, Al2Fe, Al5Fe2 and Al13Fe4 in the Al-Fe system were treated as (Al,Fe,Mo), Al2(Fe,Mo), (Al,Fe)5(Al,Fe,Mo)2 and (Fe,Mo)0.235Al0.6275(Al,Va)0.1375 in the Al-Fe-Mo system, respectively. Ternary compounds s1 and s2 were treated as Al8(Al,Fe)Mo3 and (Al,Fe,Mo)(Va)3, respectively. A set of self-consistent thermodynamic parameters of the Al-Fe-Mo system was obtained.
Keywords
Al-Fe-Mo system, aluminum alloys, CALPHAD technique, phase equilibria, thermodynamic properties
In the present work, thermodynamic modeling and optimization of the Al-Mo binary and the Al-Fe-Mo ternary systems are performed using the CALPHAD method on the basis of the experimental data reported in the literature.
1. Introduction
2. Experimental Information
The Al-Fe alloys with high Al contents are attractive for high-temperature applications because of their outstanding oxidation and hot-corrosion resistance.[1,2] However, insufficient strength and creep resistance have been identified as obstacles for the use of Fe-Al-based alloys at high temperatures. Molybdenum is one of the elements often added to improve the properties of Al-Fe alloys. The mechanical properties of Al-Fe-Mo alloys have been studied by many researchers, e.g. Eumann et al.[3,4] Knowledge of the Al-Fe-Mo phase diagram is significant for the development of Fe-Al-based alloys by providing information regarding the phases that are present at service temperatures, their compositions and volume fractions and so on.[5]
2.1 Al-Mo System
This article is an invited paper selected from participants of the 14th National Conference and Multilateral Symposium on Phase Diagrams and Materials Design in honor of Prof. Zhanpeng Jin’s 70th birthday, held November 3-5, 2008, in Changsha, China. The conference was organized by the Phase Diagrams Committee of the Chinese Physical Society with Drs. Huashan Liu and Libin Liu as the key organizers. Publication in Journal of Phase Equilibria and Diffusion was organized by J.-C. Zhao, The Ohio State University; Yong Du, Central South University; and Qing Chen, Thermo-Calc Software AB. Dedicated to Professor Dr. Zha
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