Temperature and composition dependence of the elastic constants of Ni{sub 3}Al

Journal Article · Wed Sep 01 04:00:00 EDT 1999 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-999-0248-9· OSTI ID:684457

Prikhodko, S V; Yang, H; Ardell, A J; Carnes, J D; Isaak, D G ^[1]

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1. 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, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 9 Vol. 30; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHEMICAL COMPOSITION
ELASTICITY
INTERMETALLIC COMPOUNDS
NICKEL ALLOYS
POISSON RATIO
TEMPERATURE DEPENDENCE
YOUNG MODULUS