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Title: Classification of the role of microalloying elements in phase decomposition of Al based alloys

Abstract

The fundamental role of microalloying elements in several aluminum alloys such as Al-Cu, Al-Li-Cu and Al-Cu-Mg has been investigated using a Monte Carlo computer simulation. All the utilized simulation parameters, e.g., pair interactions between same atoms species, between different atom species and between an atom and a vacancy, were derived from known thermodynamic or kinetic quantities. A small addition of Mg to Al-Cu alloys exhibits a strong tendency to form Mg/Cu/Vacancy complexes in the atom configurations, which is more remarkably revealed in Al-Li-Cu alloys. The combined addition of Ag or Si with Mg significantly increases the number of Mg/Cu/Vacancy complexes in Al-Cu-Mg alloys. From the comparison with experimentally reported results, these complexes are reasonably regarded as an effective heterogeneous nucleation site for BP zones, GPB zones and/or the {Omega} phase. The utilized simulation model, furthermore, permits the role of microalloying elements to be well classified in terms of the characteristic features of each element.

Authors:
; ; ;
Publication Date:
Research Org.:
Imperial Coll. of Science, Technology and Medicine, London (GB)
OSTI Identifier:
20075935
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 8; Other Information: PBD: 11 May 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; ALUMINIUM BASE ALLOYS; COMPUTERIZED SIMULATION; MONTE CARLO METHOD; NUCLEATION; PHASE STUDIES

Citation Formats

Hirosawa, S., Sato, T., Kamio, A., and Flower, H.M. Classification of the role of microalloying elements in phase decomposition of Al based alloys. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(99)00475-9.
Hirosawa, S., Sato, T., Kamio, A., & Flower, H.M. Classification of the role of microalloying elements in phase decomposition of Al based alloys. United States. doi:10.1016/S1359-6454(99)00475-9.
Hirosawa, S., Sato, T., Kamio, A., and Flower, H.M. Thu . "Classification of the role of microalloying elements in phase decomposition of Al based alloys". United States. doi:10.1016/S1359-6454(99)00475-9.
@article{osti_20075935,
title = {Classification of the role of microalloying elements in phase decomposition of Al based alloys},
author = {Hirosawa, S. and Sato, T. and Kamio, A. and Flower, H.M.},
abstractNote = {The fundamental role of microalloying elements in several aluminum alloys such as Al-Cu, Al-Li-Cu and Al-Cu-Mg has been investigated using a Monte Carlo computer simulation. All the utilized simulation parameters, e.g., pair interactions between same atoms species, between different atom species and between an atom and a vacancy, were derived from known thermodynamic or kinetic quantities. A small addition of Mg to Al-Cu alloys exhibits a strong tendency to form Mg/Cu/Vacancy complexes in the atom configurations, which is more remarkably revealed in Al-Li-Cu alloys. The combined addition of Ag or Si with Mg significantly increases the number of Mg/Cu/Vacancy complexes in Al-Cu-Mg alloys. From the comparison with experimentally reported results, these complexes are reasonably regarded as an effective heterogeneous nucleation site for BP zones, GPB zones and/or the {Omega} phase. The utilized simulation model, furthermore, permits the role of microalloying elements to be well classified in terms of the characteristic features of each element.},
doi = {10.1016/S1359-6454(99)00475-9},
journal = {Acta Materialia},
issn = {1359-6454},
number = 8,
volume = 48,
place = {United States},
year = {2000},
month = {5}
}