Temperature and composition dependence of the elastic constants of Ni{sub 3}Al
- Univ. of California, Los Angeles, CA (United States)
The stiffness constants, c{sub ij}, of monocrystalline Ni{sub 3}Al of three different compositions, 23.2, 24.0, and 25.0 at. pct Al, were measured over the temperature range from 300 to 1,100 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 Ni{sub 3}Al, were derived from the stiffness constants. The data indicate that c{sub 44} is essentially independent of composition, decreasing slightly with increasing temperature for all three alloys. The values of c{sub 11} and c{sub 12}, however, decrease with increasing aluminum content, the difference being small at room temperature but becoming larger at higher temperatures. The authors find that c{sub 11} and c{sub 12} are not as sensitive to aluminum concentration as is implied by previous results. A comparison of different shear moduli of Ni{sub 3}Al 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 Ni{sub 3}Al precipitate has been heavily investigated.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Office of Naval Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- FG03-96ER45573
- OSTI ID:
- 684457
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 30, Issue 9; Other Information: PBD: Sep 1999
- Country of Publication:
- United States
- Language:
- English
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