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Title: Ab Initio Study of Stability, Local Order, and Phase Diagram For a Series of bcc-based Transition Metal Alloys

Abstract

In this work, a parameter-free electronic structure approach is applied to the study of stability and chemical order in the 15 substitutional body-centered cubic (bcc)-based alloys made of the six transition metals of groups 5 (V, Nb, Ta) and 6 (Cr, Mo, W) of the periodic table. The method is based on a Green’s function description of the electronic structure of the random alloys. Configurational order is treated within the generalized perturbation method, and temperature effects are examined with a generalized mean-field approach. In contrast to the results summarized in the assessed phase diagrams, stability and ordering trends are predicted in a broad range of alloy composition for at least seven alloys, and explanation is found in their electronic structure properties. Short-range order results, thermodynamics analysis, and bcc-based phase diagrams are also presented.

Authors:
 [1];  [2];  [2];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Academy of Sciences of the Czech Republic (Czech Republic)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; Czech Science Foundation (GACR)
OSTI Identifier:
1769115
Report Number(s):
LLNL-JRNL-810379
Journal ID: ISSN 1547-7037; 1015579
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Phase Equilibria and Diffusion
Additional Journal Information:
Journal Volume: 41; Journal Issue: 6; Journal ID: ISSN 1547-7037
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ab initio methods; metallic alloys; phase diagram; stability

Citation Formats

Turchi, P. E. A., Drchal, V., Kudrnovsky, J., and Perron, A. Ab Initio Study of Stability, Local Order, and Phase Diagram For a Series of bcc-based Transition Metal Alloys. United States: N. p., 2020. Web. doi:10.1007/s11669-020-00846-w.
Turchi, P. E. A., Drchal, V., Kudrnovsky, J., & Perron, A. Ab Initio Study of Stability, Local Order, and Phase Diagram For a Series of bcc-based Transition Metal Alloys. United States. https://doi.org/10.1007/s11669-020-00846-w
Turchi, P. E. A., Drchal, V., Kudrnovsky, J., and Perron, A. Thu . "Ab Initio Study of Stability, Local Order, and Phase Diagram For a Series of bcc-based Transition Metal Alloys". United States. https://doi.org/10.1007/s11669-020-00846-w. https://www.osti.gov/servlets/purl/1769115.
@article{osti_1769115,
title = {Ab Initio Study of Stability, Local Order, and Phase Diagram For a Series of bcc-based Transition Metal Alloys},
author = {Turchi, P. E. A. and Drchal, V. and Kudrnovsky, J. and Perron, A.},
abstractNote = {In this work, a parameter-free electronic structure approach is applied to the study of stability and chemical order in the 15 substitutional body-centered cubic (bcc)-based alloys made of the six transition metals of groups 5 (V, Nb, Ta) and 6 (Cr, Mo, W) of the periodic table. The method is based on a Green’s function description of the electronic structure of the random alloys. Configurational order is treated within the generalized perturbation method, and temperature effects are examined with a generalized mean-field approach. In contrast to the results summarized in the assessed phase diagrams, stability and ordering trends are predicted in a broad range of alloy composition for at least seven alloys, and explanation is found in their electronic structure properties. Short-range order results, thermodynamics analysis, and bcc-based phase diagrams are also presented.},
doi = {10.1007/s11669-020-00846-w},
journal = {Journal of Phase Equilibria and Diffusion},
number = 6,
volume = 41,
place = {United States},
year = {Thu Dec 10 00:00:00 EST 2020},
month = {Thu Dec 10 00:00:00 EST 2020}
}

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