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Dissolution of Cu/Mg bearing intermetallics in Al-Si foundry alloys

Javidani Mousa, Larouche Daniel et Chen X-Grant. (2016). Dissolution of Cu/Mg bearing intermetallics in Al-Si foundry alloys. Metallurgical and Materials Transactions A, 47, (10), p. 4818-4830.

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URL officielle: http://dx.doi.org/doi:10.1007/s11661-016-3669-2

Résumé

Evolutions of the Cu/Mg bearing intermetallics were thoroughly investigated in four Al-Si hypoeutectic alloys containing various Cu (1 and 1.6 wt pct) and Mg (0.4 and 0.8 wt pct) contents. The area fractions of Cu/Mg bearing phases before and after solution heat treatment (SHT) were quantified to evaluate the solubility/stability of the phases. Two Mg-bearing intermetallics (Q-Al5Cu2Mg8Si6, π-Al8FeMg3Si6) which appear as gray color under optical microscope were discriminated by the developed etchant. Moreover, the concentrations of the elements (Cu, Mg, and Si) in α-Al were analyzed. The results illustrated that in the alloys containing ~0.4 pct Mg, Q-Al5Cu2Mg8Si6 phase was dissolved after 6 hours of SHT at 778 K (505 °C); but containing in the alloys ~0.8 pct Mg, it was insoluble/ partially soluble. Furthermore, after SHT at 778 K (505 °C), Mg2Si was partially substituted by Q-phase. Applying a two-step SHT [6 hours@778 K (505 °C) + 8 hours@798 K (525 °C)] in the alloys containing ~0.4 pct Mg helped to further dissolve the remaining Mg bearing intermetallics and further modified the microstructure, but in the alloys containing ~0.8 pct Mg, it caused partial melting of Q-phase. Thermodynamic calculations were carried out to assess the phase formation in equilibrium and in non-equilibrium conditions. There was an excellent agreement between the experimental results and the predicted results.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1073-5623
Volume:47
Numéro:10
Pages:p. 4818-4830
Version évaluée par les pairs:Oui
Date:1 Août 2016
Identifiant unique:10.1007/s11661-016-3669-2
Sujets:Sciences naturelles et génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:solution heat treatment, foundry alloy, wavelength dispersive spectrometer, Mg2Si phase, bearing phasis, traitement thermique de solution, alliage de fonderie, spectromètre dispersif de longueur d'onde, phase Mg2Si, phase de roulement
Déposé le:01 mars 2021 21:44
Dernière modification:01 mars 2021 21:44
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