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Open AccessArticle
Influence of Si on the Elevated-Temperature Mechanical and Creep Properties of Al–Cu 224 Cast Alloys during Thermal Exposure
by
Kun Liu
Kun Liu 1,
Zimeng Wang
Zimeng Wang 1,
Lei Pan
Lei Pan 2 and
X.-Grant Chen
X.-Grant Chen 1,*
1
Department of Applied Science, University of Quebec at Chicoutimi, Saguenay, QC G7H 2B1, Canada
2
Arvida Research and Development Centre, Rio Tinto Aluminum, Saguenay, QC G7S 4K8, Canada
*
Author to whom correspondence should be addressed.
Materials 2024, 17(19), 4805; https://doi.org/10.3390/ma17194805 (registering DOI)
Submission received: 2 September 2024
/
Revised: 27 September 2024
/
Accepted: 28 September 2024
/
Published: 29 September 2024
Abstract
The influence of Si content (0.1–0.8 wt.%) on the development of precipitation microstructures and the resultant mechanical and creep properties during thermal exposure, up to 1000 h at 300 °C, in Al–Cu 224 cast alloys, was systematically investigated. The room and elevated temperature yield strength (YS) increased with increasing Si content under the T7 condition, which was attributed to the fact that the Si promoted the precipitation of fine θ′. However, Si increased the coarsening of θ′ during thermal exposure at 300 °C, and the alloys with low Si exhibited a higher YS and creep resistance at elevated temperatures than high Si alloys. The mechanical strength and creep resistance were mainly controlled by the precipitation strengthening of the predominant θ′ phase. Because of the high mechanical strength and creep resistance of the 0.1Si alloy during long-term thermal exposure, the Si level in Al–Cu alloys should be maintained at a low level of 0.1 wt.% for high-temperature applications. The strengthening mechanisms were quantitatively analyzed, based on the characteristics of the precipitate. The predicted YS values under different exposure conditions agreed well with the experimentally measured values.
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MDPI and ACS Style
Liu, K.; Wang, Z.; Pan, L.; Chen, X.-G.
Influence of Si on the Elevated-Temperature Mechanical and Creep Properties of Al–Cu 224 Cast Alloys during Thermal Exposure. Materials 2024, 17, 4805.
https://doi.org/10.3390/ma17194805
AMA Style
Liu K, Wang Z, Pan L, Chen X-G.
Influence of Si on the Elevated-Temperature Mechanical and Creep Properties of Al–Cu 224 Cast Alloys during Thermal Exposure. Materials. 2024; 17(19):4805.
https://doi.org/10.3390/ma17194805
Chicago/Turabian Style
Liu, Kun, Zimeng Wang, Lei Pan, and X.-Grant Chen.
2024. "Influence of Si on the Elevated-Temperature Mechanical and Creep Properties of Al–Cu 224 Cast Alloys during Thermal Exposure" Materials 17, no. 19: 4805.
https://doi.org/10.3390/ma17194805
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