Analysis shows thermal expansion coefficients for intermetallic phase T1 and α-solid solution in B-1480 alloy, suggesting unique anisotropic properties.
For the B-1480 alloy of the Al-Cu-Li system, the thermal coefficients of linear expansion (TCLE) of the α-solid solution and the intermetallic phase T1 (Al2CuLi) were determined, based on the results of X-ray diffraction performed at temperatures of 100-500 °C. It was found that for the α-solid solution with the FCC-lattice the TCLE is 26.2·10-6 K-1, for the T1-phase with the HCP-lattice it is 20.1·10-6 and 5.2·10-6 K-1 in the direction of the A and C axes, respectively. The unusual shape of the T1-phase particles in the form of thin plates with a diameter almost two orders of magnitude greater than their thickness is explained by the high anisotropy of the interatomic bond forces, which manifested itself in a fourfold difference in the TCLE values in the basal plane and along the C axis of the HCP-lattice of this phase.
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Betsofen et al. (2025) studied this question.
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