Metallurgical and Materials Transactions A

, Volume 37, Issue 11, pp 3171–3181

Thermodynamic properties of B2-AlFeNi Alloys. Part I: Investigation by knudsen effusion mass spectrometry

  • L. Bencze
  • T. Markus
  • D. Kath
  • S. Dash
  • D. D. Raj
  • W. A. Oates
  • W. Löser
  • K. Hilpert
Article

DOI: 10.1007/BF02586151

Cite this article as:
Bencze, L., Markus, T., Kath, D. et al. Metall and Mat Trans A (2006) 37: 3171. doi:10.1007/BF02586151

Abstract

The vaporization of Al-Fe-Ni alloys has been investigated in the temperature range 1180 to 1508 K by Knudsen effusion mass spectrometry (KEMS). Fourteen different compositions were examined in the B2 region: 10 compositions at two fixed Al concentrations,xAl=0.45 andxAl=0.50 plus four extra compositions at constantxNi/xFe=1. For the first time, reliable partial pressures and thermodynamic activities of Al, Fe, and Ni have been evaluated from the measured ion intensities for both the alloy and the pure element. Gibbs energies, partial molar enthalpies, and entropies of formation for all the components have also been obtained. The relative partial molar enthalpies and entropies were found to be nearly temperature independent over the wide temperature ranges investigated. At 1400 K, the Gibbs energy of formation of Al0.50Fe0.25Ni0.25 and Al0.45Fe0.275Ni0.275, with Al(liq), Fe(fcc), and completely paramagnetic Ni(fcc,cpm) as reference states, are −37.9±0.42 kJ/mol and −38.1±0.42 kJ/mol, respectively. At the same temperature, the enthalpies of formation of Al0.50Fe0.25Ni0.25 and Al0.45Fe0.275Ni0.275, with the same reference states, are −51.5±1.7 kJ/mol and −49.2±1.7 kJ/mol, respectively.

Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2006

Authors and Affiliations

  • L. Bencze
    • 1
  • T. Markus
    • 2
  • D. Kath
    • 2
  • S. Dash
    • 3
  • D. D. Raj
    • 4
  • W. A. Oates
    • 5
  • W. Löser
    • 6
  • K. Hilpert
    • 7
  1. 1.Department of Physical ChemistryRoland Eotvos UniversityBudapestHungary
  2. 2.Research Center Jülich (KFA)Institute for Materials and Processes in Energy Systems (IWV-2)JülichGermany
  3. 3.Fuel Chemistry DivisionBhabha Atomic Research CenterTrombay, MumbaiIndia
  4. 4.Materials Chemistry DivisionIndira Gandhi Centre for Atomic Research (GCAAR), KalpakkamTamil NaduIndia
  5. 5.Institute of Materials ResearchUniversity of SalfordSalfordUnited Kingdom
  6. 6.IFW DresdenDresdenGermany
  7. 7.Research Center Jülich (KFA), Institute for Materials and Processes in Energy Systems (IWV-2), is ProfessorTechnical University DarmstadtDarmstadtGermany