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Open AccessArticle

Improving the Mechanical Response of Al–Mg–Si 6082 Structural Alloys during High-Temperature Exposure through Dispersoid Strengthening

1
Department of Applied Science, University of Quebec at Chicoutimi, Saguenay, QC G7H 2B1, Canada
2
Arvida Research and Development Center, Rio Tinto Aluminum, Saguenay, QC G7S 4K8, Canada
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(22), 5295; https://doi.org/10.3390/ma13225295
Received: 20 October 2020 / Revised: 17 November 2020 / Accepted: 18 November 2020 / Published: 23 November 2020
The feasibility and efficacy of improving the mechanical response of Al–Mg–Si 6082 structural alloys during high temperature exposure through the incorporation of a high number of α-dispersoids in the aluminum matrix were investigated. The mechanical response of the alloys was characterized based on the instantaneous high-temperature and residual room-temperature strengths during and after isothermal exposure at various temperatures and durations. When exposed to 200 °C, the yield strength (YS) of the alloys was largely governed by β” precipitates. At 300 °C, β” transformed into coarse β’, thereby leading to the degradation of the instantaneous and residual YSs of the alloys. The strength improvement by the fine and dense dispersoids became evident owing to their complementary strengthening effect. At higher exposure temperatures (350–450 °C), the further improvement of the mechanical response became much more pronounced for the alloy containing fine and dense dispersoids. Its instantaneous YS was improved by 150–180% relative to the base alloy free of dispersoids, and the residual YS was raised by 140% after being exposed to 400–450 °C for 2 h. The results demonstrate that introducing thermally stable dispersoids is a cost-effective and promising approach for improving the mechanical response of aluminum structures during high temperature exposure. View Full-Text
Keywords: Al–Mg–Si 6082 alloys; microstructure; high-temperature mechanical properties; residual mechanical behavior; α-Al(MnFe)Si dispersoids Al–Mg–Si 6082 alloys; microstructure; high-temperature mechanical properties; residual mechanical behavior; α-Al(MnFe)Si dispersoids
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MDPI and ACS Style

Rakhmonov, J.; Liu, K.; Rometsch, P.; Parson, N.; Chen, X.-G. Improving the Mechanical Response of Al–Mg–Si 6082 Structural Alloys during High-Temperature Exposure through Dispersoid Strengthening. Materials 2020, 13, 5295. https://doi.org/10.3390/ma13225295

AMA Style

Rakhmonov J, Liu K, Rometsch P, Parson N, Chen X-G. Improving the Mechanical Response of Al–Mg–Si 6082 Structural Alloys during High-Temperature Exposure through Dispersoid Strengthening. Materials. 2020; 13(22):5295. https://doi.org/10.3390/ma13225295

Chicago/Turabian Style

Rakhmonov, Jovid; Liu, Kun; Rometsch, Paul; Parson, Nick; Chen, X.-Grant. 2020. "Improving the Mechanical Response of Al–Mg–Si 6082 Structural Alloys during High-Temperature Exposure through Dispersoid Strengthening" Materials 13, no. 22: 5295. https://doi.org/10.3390/ma13225295

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