Classification of the role of microalloying elements in phase decomposition of Al based alloys
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.
- Research Organization:
- Imperial Coll. of Science, Technology and Medicine, London (GB)
- OSTI ID:
- 20075935
- Journal Information:
- Acta Materialia, Vol. 48, Issue 8; Other Information: PBD: 11 May 2000; ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
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