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Phase equilibria of the Al-Li binary system

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Abstract

The solid + liquid phase equilibria between α-Al and β-AlLi were determined using differential thermal analysis (DTA), metallography, and chemical analysis. Boron nitride (BN), which was found to be inert to these alloys, was used as the container. These measurements were carried out in order to resolve the discrepancies reported in the literature. The α-Al+β-AlLi eutectic temperature and composition were determined to be 600 °C±1 °C and 25.8±0.5 at. pct Li. Using these data and data reported in the literature concerning the phase equilibria and thermodynamic properties, thermodynamic models for all the phases were obtained by optimization. The thermodynamic values obtained for the β-AlLi phase describe not only the phase equilibria, but also yield structural defect data in agreement with measured values. The assessed enthalpies of formation, excess entropies of formation, and entropies of melting for all the intermetallic phases obtained are compared with empirical correlations when experimental data are not available. In addition to the stable diagram, a metastable diagram involving the δ′-Al3Li is also calculated from the thermodynamic models. The calculated diagram is in good agreement with the experimental data.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Wisconsin-Madison, 1509 University Avenue, 53706, Madison, WI

    Sinn-Wen Chen (Research Assistant), Chia-Hong Jan (Research Assistant), Jen-Chwen Lin (Research Associate) & Y. Austin Chang (Wisconsin Distinguished Professor and Chairman)

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  1. Sinn-Wen Chen
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Chen, SW., Jan, CH., Lin, JC. et al. Phase equilibria of the Al-Li binary system. Metall Trans A 20, 2247–2258 (1989). https://doi.org/10.1007/BF02666660

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