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Title: First-Principles Calculations, Experimental Study, and Thermodynamic Modeling of the Al-Co-Cr System

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [1];  [2];  [1]
  1. Pennsylvania State University, University Park, PA (United States)
  2. University of Pittsburgh, PA (United States)
  3. KTH Royal Institute of Technology, Stockholm (Sweden)

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:
Univ. of Pittsburgh, PA (United States); Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); European Research Fund for Coal and Steel (RFCS)
Grant/Contract Number:
FE0007271; IIP-1034965; IIP-1034968; N0014-07-1-0638; RFSR-CT-2010-00018
OSTI ID:
1904847
Journal Information:
PLoS ONE, Vol. 10, Issue 4; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Experimental study and thermodynamic modeling of the Al–Co–Cr–Ni system journal October 2015