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High Temperature Strength of Ordered and Disordered Ni4Mo

  • H. P. Kao (a1), C. R. Brooks (a1) and K. Vasudevan (a1)

Abstract

The alloy Ni−20 at. % Mo is FCC and disordered at high temperatures, but below 868°C forms a superlattice of the D1a type. The disordered structure can be retained by quenching, and subsequent aging below 868°C can develop a variety of ordered domain structures. In the disordered condition, the yield stength at 25°C is typically 140– The tensile properties were measured for two ordered domain sizes: 24 nm and 3,000 nm. For the 24 nm domain size, the yield strength at 25°C was 862 MPa (125,000 psi). This decreased with increasing test temperature to about 690 MPa (100,000 psi) at 800°C, then decreased greatly to about 210 MPa (30,000 psi) at 1000°C. In the ordered condition, the alloy had a very low ductility (1% elongation or less) from 25°C to the disordering temperature of 868°C, above which it increased considerably (e.g., 30% elongation). The alloy with the 3,000 nm domain size showed similar behavior, although the strength was less. (The ordered alloy with 24 nm domain size had a yield strength-temperature curve similar to that of Waspaloy.) These results are correlated with fractography of the tensile samples.

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References

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1. Stoloff, N. S., Int. Metals Rev. 29, 123 (1984).
2. See Pope, D. P. and Ezz, S. S., Int. Metals Rev. 29, 136 (1984).
3. Brooks, C. R., Spruiell, J. E. and Stansbury, E. E., Int. Metals Rev. 29, 210 (1984).
4. Kao, H. P. and Brooks, C. R., Scripta Met., 20, 1561 (1986).
5. Kao, H. P., Ph.D. dissertion, The University of Tennessee (1986).
6. Metals Handbook, 8th edition, Vol. 9 Fractoqraphy and Atlas of Fractoqraphs, American Society for Metals, Metals Park, Ohio (1974).

High Temperature Strength of Ordered and Disordered Ni4Mo

  • H. P. Kao (a1), C. R. Brooks (a1) and K. Vasudevan (a1)

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