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Effects of compositional variation on the thermal stability of θ′-Al2Cu precipitates and elevated-temperature strengths in Al-Cu 206 alloys

Rakhmonov Jovid, Liu Kun et Chen X-Grant. (2020). Effects of compositional variation on the thermal stability of θ′-Al2Cu precipitates and elevated-temperature strengths in Al-Cu 206 alloys. Journal of Materials Engineering and Performance, 29, (11), p. 7221-7230.

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URL officielle: http://dx.doi.org/doi:10.1007/s11665-020-05227-5

Résumé

This study explored the effects of compositional variation of Al-Cu 206 alloys (Si and Mn concentrations, 0.12 versus 0.3 wt.% each) on the precipitation and thermal stability of h¢ precipitates, and the associated elevated-temperature strengths during long-term thermal exposure at 300 C. The results indicated that both alloys under the T7 condition exhibited comparable yield strengths at 20 and 300 C, which were predominantly controlled by h¢ precipitates. Upon exposure at 300 C for up to 1000 h, the h¢ precipitates in the alloy with low Si and Mn concentrations remained stable and resistant to transformation into the equilibrium h phase. The coarsening of h¢ proceeded through both lengthening and thickening, resulting in the continuing decline in YS at 300 C from 93 MPa after 300 C/100 h to 78 MPa after 300 C/1000 h. Conversely, the h¢ precipitates in the alloy with high Si and Mn concentrations underwent almost complete transformation into deleterious h after only 100 h at 300 C, thus imparting a significantly lower YS of 69 MPa after 300 C/100 h. The possible sources of these microstructure and property changes with the compositional variation were explored. This study has implications for strategic design of Al-Cu alloys for high-temperature applications.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:29
Numéro:11
Pages:p. 7221-7230
Version évaluée par les pairs:Oui
Date:2020
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 > Module d'ingénierie
Mots-clés:θ′-Al2Cu precipitates, Al-Cu 206 alloys, coarsening, high-temperature strength, precipitation kinetics
Déposé le:12 févr. 2021 13:59
Dernière modification:12 févr. 2021 13:59
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