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arXiv · 2211.14413

Engineering ultra-strong Mg-Li-Al-based light-weight alloys from first principles

Okan K. Orhan·Mauricio Ponga
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Abstract

Light-weight alloys are essential pillars of transportation technologies. They also play a crucial role to achieve a more green and cost-effective aerospace technologies. Magnesium-lithium-aluminum (Mg-Li-Al) alloys are auspicious candidates due to their promising mechanical strengths at low densities. We herein present a systematic first-principles investigation of the Mg-Li-Al-based alloys to provide insights for designing ultra-strong light-weight alloys. Initial analysis indicates that the Mg-Li-Al mixtures are not thermally stabilized into random-solid solutions. Following this hint, the base-centered cubic (BCC)-based intermetallics of Mg, Li and Al are investigated for their thermal and elastic stabilities.Three simple figures of merits are used to further assess their mechanical strengths. The most-frequently observed intermetallics are used to predict the yield strength of the hetero-structures from the recent experimental works. The rule of mixing works reasonable well to predict the mechanical properties of complex structures starting from isolated intermetallics.

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Okan K. Orhan, Mauricio Ponga. 2022-11-26. Engineering ultra-strong Mg-Li-Al-based light-weight alloys from first principles. https://arxiv.org/abs/2211.14413

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