Abstract
Electromotive force (emf) studies were made for solid and liquid AI-Cu-Li alloys. Measurements were conducted on four sets of alloys at temperatures and composition ranges as follows (where XLi is mole fraction):
T/K | XAl/XCu | Li Composition Range |
|---|---|---|
888 | 9 | 0.001 ≤XLi ≤ 0.639 |
888 | 4 | 0.013 ≤XLi ≤ 0.815 |
828 | 7/3 | 0.0001 ≤ XLi ≤ 0.5 |
778 | 7/3 | 0.0032 ≤ XLi ≤ 0.639 |
For these alloys, the Li concentration was introduced into an alloy by coulometric titration. Supplementary emf measurements were made at 828 K on 23 pyrometallugically prepared alloys with XA1/XCu=7/3 and with a XLi range of 0.05≤XLi≤0.639. Good agreement was observed between the results from this set of alloys and the results from alloys prepared by coulometric titration. Drop calorimetric studies also were performed at two temperatures to determine mixing enthalpies for liquid Al-Cu-Li alloys. At 986 K, Cu was dropped into an Al-Li bath with XAl/XLi=4 to form liquid alloys with 0.02≤XCu≤0.285, and, at 945 K, Li was dropped into an Al-Cu bath to form alloys with 0.023≤XLi≤0.265. The experimental emf and calorimetric results were combined with available data from the literature to make a new evaluation and to calculate the Al-Cu-Li phase diagram. Good conformity between emf and calorimetric results from the present studies and the optimized thermodynamic parameters was observed for XAl/XCu=9 and 4; however, for XAI/XCu=7/3, differences were observed in the one-, two-, and three-phase boundaries when compared with existing and calculated phase equilibria of the AI-Cu-Li system.
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Moser, Z., Gasior, W., Onderka, B. et al. Al-Cu-Li system electromotive force and calorimetric studies—Phase diagram calculations of the Al-Rich part. JPE 23, 127 (2002). https://doi.org/10.1361/1054971023604134
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DOI: https://doi.org/10.1361/1054971023604134