Metallurgical and Materials Transactions B

, Volume 1, Issue 5, pp 1263–1265 | Cite as

The application of a quasichemical solid solution model to carbon austenite

  • William W. Dunn
  • Rex B. McLellan
Physical Chemistry


The recent extensive data for the variation with temperature and composition of the activity of carbon in austenite has been analyzed using a quasichemical model for interstitial solid solutions. The most important parameter in the theoretical activity equation is the pairwise binding energy Δε between two nearest-neighbor solute atoms. A computer fitting method has shown that the new activity data for austenite, which spans a temperature range from 900° to 1400°C and compositions ranging from very dilute up to the limiting composition of the phase boundary, are compatible with the theoretical model with a Δε-value of -2 kcals per mole which is independent of both temperature and composition.


Austenite Metallurgical Transaction Solute Atom Interstitial Solid Solution Octahedral Interstitial Site 
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Copyright information

© The Minerals, Metals & Materials Society - ASM International - The Materials Information Society 1970

Authors and Affiliations

  • William W. Dunn
    • 1
  • Rex B. McLellan
    • 1
  1. 1.Department of Mechanical and Aerospace Engineering and Materials ScienceWilliam Marsh Rice UniversityHouston

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