Abstract
The stiffness constants, c ij , of monocrystalline Ni3Al of three different compositions, 23.2, 24.0, and 25.0 at. pct Al, were measured over the temperature range from 300 to 1100 K using the rectangular parallelepiped resonance (RPR) method. The bulk modulus, as well as the shear modulus, Young’s modulus, and Poisson’s ratio for randomly oriented polycrystalline stoichiometric Ni3Al, were derived from the stiffness constants. The data indicate that c 44 is essentially independent of composition, decreasing slightly with increasing temperature for all three alloys. The values of c 11 and c 12, however, decrease with increasing aluminum content, the difference being small at room temperature but becoming larger at higher temperatures. We find that c 11 and c 12 are not as sensitive to aluminum concentration as is implied by previous results. A comparison of different shear moduli of Ni3Al and the saturated Ni-Al solid solution in equilibrium with it indicates that the ordered phase is generally elastically stiffer than the solid solution over the range of temperatures at which coarsening of the Ni3Al precipitate has been heavily investigated.
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Prikhodko, S.V., Yang, H., Ardell, A.J. et al. Temperature and composition dependence of the elastic constants of Ni3Al. Metall Mater Trans A 30, 2403–2408 (1999). https://doi.org/10.1007/s11661-999-0248-9
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DOI: https://doi.org/10.1007/s11661-999-0248-9