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Thermodynamic reassessment of the Al–V system

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Veröffentlicht/Copyright: 26. Januar 2022
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 95 Heft 11

Abstract

An optimized set of thermodynamic functions to describe the Al –V system has been obtained by a computer-operated least squares method applied to the experimental phase diagram and thermodynamic data available from the literature. Special attention is paid to the modeling of the intermediate phase Al8V5. Based on the crystal structure data, Al8V5 is described by a sublattice model Al6/13(Al, V)2/13 (Al, V)3/13V2/13 in a final treatment. The boldface Al and V mean the normal atoms (i. e., major species) in the sublattices. In order to provide reasonable starting values for the final modeling, three treatments are performed. In the first treatment, Al8V5 is assumed to be a stoichiometric compound; in the second and third ones, it is described by sublattice models Al6/13(Al, V)2/13V5/13 and Al8/13(Al, V)3/13V2/13, respectively. This step-by-step modeling procedure provides reliable estimates and useful starting values for the parameters at each of the higher levels. The other phases (liquid, fcc (Al), and bcc (V)) are modeled with the Redlich – Kister formula or as stoichiometric phases (Al21V2, Al45V7, Al23V4, and Al3V). Comparisons between the calculated and measured phase diagrams as well as thermodynamic quantities indicate that almost all of the reliable experimental information is satisfactorily accounted for by the thermodynamic description of the final treatment. The consistent thermodynamic functions from the first, second, and third treatments are useful for a simplified description of the Al –V system if less accuracy for the Al8V5 phase is required.

Professor Dr. Yong Du Innovative Materials Design Group State Key Laboratory of Powder Metallurgy Central South University Changsha, Hunan, 410083, P. R. China Tel.: +86 731 8836 213 Fax: +86 731 8710 855

  1. The financial support from National Advanced Materials Committee of P. R. China (grant no. 2003AA302520) is greatly acknowledged. One of the authors (Weiping Gong) would like to thank the grant released by the Chinese Postdoctoral Foundation. Yong Du acknowledges Furong Chair Professorship Program released by Hunan Province of P. R. China for financial support. Thanks are due to Dr. Suzana Fries (Germany) for her valuable discussions about the enthalpy formation of Al3V and Al8V5. Special thanks are also due to Dr. Tengfei Chen for his useful help. The use of the Thermo-Calc software is greatly appreciated. Pandat program from Prof. Y. A. Chang is used to check the Al–V phase diagram resulting from the final parameters.

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Received: 2004-01-27
Accepted: 2004-08-17
Published Online: 2022-01-26

© 2004 Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Frontmatter
  2. Articles Basic
  3. Phase formation, thermal stability and crystallization behavior of Cu47Ti33Zr11Ni8X1 (X = Fe, Si, Sn, Pb) bulk glassy alloys
  4. Thermodynamic reassessment of the Al–V system
  5. Experimental investigation of the equilibrium composition of titanium carbonitride and analysis using thermodynamic modelling
  6. A model for 3-D study of rearrangement in liquid phase sintering
  7. Measurement and calculation of surface tension of undercooled liquid Fe-20 wt.% Cu alloy
  8. Phase equilibria in iron-rich Fe–Al–V ternary alloy system
  9. Articles Applied
  10. Evolution of microstructure during creep in gamma Ti–52Al at 1100 K and high applied stresses
  11. Effect of tempering on the chemical and phase composition of MxCy precipitates in low carbon chromium-molybdenum-vanadium steel
  12. Phase changes in superaustenitic steels after long-term annealing
  13. 3D and microstructural analysis of the chip formation during high speed cutting of C45E (AISI 1045)
  14. Elevated temperature friction and wear behavior of SiC-reinforced copper matrix composites
  15. On the microstructure developed in as-cast and homogenized 7010 aluminium alloy containing scandium
  16. Notifications/Mitteilungen
  17. Personal/Personelles
  18. Conferences/Konferenzen
https://doi.org/10.3139/ijmr-2004-0180

Artikel in diesem Heft

  1. Frontmatter
  2. Articles Basic
  3. Phase formation, thermal stability and crystallization behavior of Cu47Ti33Zr11Ni8X1 (X = Fe, Si, Sn, Pb) bulk glassy alloys
  4. Thermodynamic reassessment of the Al–V system
  5. Experimental investigation of the equilibrium composition of titanium carbonitride and analysis using thermodynamic modelling
  6. A model for 3-D study of rearrangement in liquid phase sintering
  7. Measurement and calculation of surface tension of undercooled liquid Fe-20 wt.% Cu alloy
  8. Phase equilibria in iron-rich Fe–Al–V ternary alloy system
  9. Articles Applied
  10. Evolution of microstructure during creep in gamma Ti–52Al at 1100 K and high applied stresses
  11. Effect of tempering on the chemical and phase composition of MxCy precipitates in low carbon chromium-molybdenum-vanadium steel
  12. Phase changes in superaustenitic steels after long-term annealing
  13. 3D and microstructural analysis of the chip formation during high speed cutting of C45E (AISI 1045)
  14. Elevated temperature friction and wear behavior of SiC-reinforced copper matrix composites
  15. On the microstructure developed in as-cast and homogenized 7010 aluminium alloy containing scandium
  16. Notifications/Mitteilungen
  17. Personal/Personelles
  18. Conferences/Konferenzen
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