First-Principles Calculations, Experimental Study, and Thermodynamic Modeling of the Al-Co-Cr System
- Pennsylvania State University, University Park, PA (United States); OSTI
- University of Pittsburgh, PA (United States)
- KTH Royal Institute of Technology, Stockholm (Sweden)
- Pennsylvania State University, University Park, PA (United States)
The phase relations and thermodynamic properties of the condensed Al-Co-Cr ternary alloy system are investigated using first-principles calculations based on density functional theory (DFT) and phase-equilibria experiments that led to X-ray diffraction (XRD) and electron probe micro-analysis (EPMA) measurements. A thermodynamic description is developed by means of the calculations of phase diagrams (CALPHAD) method using experimental and computational data from the present work and the literature. Emphasis is placed on modeling the bcc-A2, B2, fcc-γ, and tetragonal-σ phases in the temperature range of 1173 to 1623 K. Liquid, bcc-A2 and fcc-γ phases are modeled using substitutional solution descriptions. First-principles special quasirandom structures (SQS) calculations predict a large bcc-A2 (disordered)/B2 (ordered) miscibility gap, in agreement with experiments. A partitioning model is then used for the A2/B2 phase to effectively describe the order-disorder transitions. The critically assessed thermodynamic description describes all phase equilibria data well. A2/B2 transitions are also shown to agree well with previous experimental findings.
- Research Organization:
- Pennsylvania State University, University Park, PA (United States); University of Pittsburgh, PA (United States)
- Sponsoring Organization:
- European Research Fund for Coal and Steel (RFCS); National Science Foundation (NSF); Office of Naval Research (ONR); USDOE Office of Fossil Energy (FE)
- Grant/Contract Number:
- FE0007271
- OSTI ID:
- 1904847
- Journal Information:
- PLoS ONE, Journal Name: PLoS ONE Journal Issue: 4 Vol. 10; ISSN 1932-6203
- Publisher:
- Public Library of ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Experimental study and thermodynamic modeling of the Al–Co–Cr–Ni system
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journal | October 2015 |
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