Journal
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
Volume 61, Issue -, Pages 275-287Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.calphad.2018.04.007
Keywords
Aluminum alloys; Aluminum machining; Thermodynamic modeling; Solubility limits; Density Functional Theory
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Rio Tinto Akan
- Alcoa
- Hydro Aluminum
- Constellium
- Canada Foundation for Innovation (CFI)
- NanoQuebec
- RMGA
- Fonds de Recherche du Quebec - Nature et Technologies (FRQ-NT)
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The aim of this work is a formulation of a thermodynamic model for the development of new aluminum machining alloys. The three additives Bi, Pb and Sn have proven to help machining. Hence, a review of the literature showed that the liquid phase equilibria and thermodynamic data for the three binary systems Al-Bi, AlPb and Al-Sn is very thorough but the limited information for the FCC solution required the use of Density Functional Theory (DFT) to predict thermodynamic data. The partial heat of mixing of these three machining additives in Al(FCC) are obtained and the results helped to improve the thermodynamic model using the CALPHAD method. It was shown that for all three binary systems, the thermodynamic data obtained at three fixed compositions and that obtained for a very dilute solution gave different enthalpy curves. The thermodynamic model was used to compute the ternary systems Al-Bi-Pb, Al-Bi-Sn and Al-Pb-Sn and small adjustable parameters were added to reproduce the literature data.
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