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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Ab initio calculation of the BCC Fe-Al-Mo (Iron-Aluminum-Molybdenum) phase diagram: Implications for the nature of the tau(2) phase

Texto completo
Autor(es):
Sodre, Ney [1] ; Gonzales-Ormeno, Pablo Guillermo [2] ; Petrilli, Helena Maria [1] ; Schoen, Claudio Geraldo [3]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Fis, Dept Fis Mat & Mecan, BR-05315970 Sao Paulo - Brazil
[2] Univ Nacl Callao, Fac Ciencias Nat & Matemat, Bellavista, Callao - Peru
[3] Univ Sao Paulo, Escola Politecn, Dept Met & Mat Engn, Computat Mat Sci Lab, BR-05508900 Sao Paulo - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY; v. 33, n. 3, p. 576-583, SEP 2009.
Citações Web of Science: 10
Resumo

The metastable phase diagram of the BCC-based ordering equilibria in the Fe-Al-Mo system has been calculated via a truncated cluster expansion, through the combination of Full-Potential-Linear augmented Plane Wave (FP-LAPW) electronic structure calculations and of Cluster Variation Method (CVM) thermodynamic calculations in the irregular tetrahedron approximation. Four isothermal sections at 1750 K, 2000 K, 2250 K and 2500 K are calculated and correlated with recently published experimental data on the system. The results confirm that the critical temperature for the order-disorder equilibrium between Fe(3)Al-D0(3) and FeAl-B2 is increased by Mo additions, while the critical temperature for the FeAl-B2/A2 equilibrium is kept approximately invariant with increasing Mo contents. The stabilization of the Al-rich A2 phase in equilibrium with overstoichiometric B2-(Fe,Mo)Al is also consistent with the attribution of the A2 structure to the tau(2) phase, stable at high temperatures in overstoichiometric B2-FeAl. (C) 2009 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 06/02470-0 - Modelamento por Monte Carlo da interação entre ordem configuracional e defeitos puntiformes em aluminetos de ferro
Beneficiário:Claudio Geraldo Schon
Linha de fomento: Auxílio à Pesquisa - Regular