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Enhanced mechanical properties of high-temperature-resistant Al–Cu cast alloy by microalloying with Mg

Rakhmonov Jovid, Liu Kun, Pan Lei, Breton Francis et Chen X.-Grant. (2020). Enhanced mechanical properties of high-temperature-resistant Al–Cu cast alloy by microalloying with Mg. Journal of Alloys and Compounds, 827, (154305),

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URL officielle: http://dx.doi.org/doi:10.1016/j.jallcom.2020.15430...

Résumé

The effects of microalloying with Mg (0–0.23 wt%) on the microstructural evolution and mechanical properties of Al–Cu 224 cast alloys at ambient and elevated temperatures are investigated using transmission electron microscopy, differential scanning calorimetry, and tensile/compression testing. The results show that microalloying with Mg significantly enhances the precipitation of the θ′ phase during aging, producing fine, dense, and uniformly distributed θ′ precipitates. These precipitates are much more effective for alloy strengthening than are the θ″ precipitates in the alloy without Mg. During stabilization at 300 °C for 100 h, the dominant process becomes coarsening of the θ′ phase. The Mg-containing alloys have much finer and denser θ′ precipitates and thus considerably higher yield strengths at elevated temperature as compared to those of the alloy without Mg. The improvement is more pronounced at low Mg contents (0.09%–0.13%) than at high contents. The yield strength at 300 °C of the 0.13% Mg alloy is as high as 140 MPa, which is far superior to that of most cast aluminum alloys. Moreover, the enhanced yield strength of this alloy is well preserved during prolonged exposure at 300 °C for 1000 h, indicating that it is a promising lightweight material for high-temperature applications.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:09258388
Volume:827
Numéro:154305
Version évaluée par les pairs:Oui
Date:25 Juin 2020
Identifiant unique:10.1016/j.jallcom.2020.154305
Sujets:Sciences naturelles et génie > 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
Mots-clés:Al–Cu alloys, Mg microalloying, microstructure, mechanical properties, high-temperature strength, precipitation, Alliages Al–Cu, microalliage Mg, microstructure, propriétés mécaniques, résistance aux hautes températures, précipitation
Déposé le:23 mars 2020 18:38
Dernière modification:23 mars 2020 18:38
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