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Damping and Modulus Measurements in B2 Transition Metal Aluminides*

Published online by Cambridge University Press:  21 February 2011

M. R. Harmouche  and
A. Wolfenden
M. R. Harmouche
Affiliation:
Texas A&M University, Mechanical Engineering Department, College Station, Texas, 77843
A. Wolfenden
Affiliation:
Texas A&M University, Mechanical Engineering Department, College Station, Texas, 77843
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Abstract

The polycrystalline intermetallic alloys FeAl (50.9 to 58.2% Fe), NiAl (49.2 to 55.9% Ni) and CoAl (48.5 to 52.3% Co) have the B2 structure and are of interest for high temperature applications. We have used the PUCOT (piezoelectric ultrasonic composite oscillator technique) to measure mechanical damping or internal friction (Q−) and Young's modulus (E) as a function of temperature and composition for these materials. The modulus data for six CoAl alloys at temperatures up to 1300 K are presented. Examples are given of the strain amplitude dependence of Q−1 for four CoAl alloys. The curves showed the break away phenomenon and are interpreted in terms of a theory dealing with the pinning of dislocation lines and their eventual break away at large strain amplitudes. The dislocation density was calculated to be about 108 m−2. For all the compositions (Xl) of CoAl studied a single equation could be fitted to the data:

E (X1, T) = 210.8 + 2.2 (XI) -0.08T (1)

where T is in K and E in GPa.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 39: Symposium G – High-Temperature Ordered Intermetallic Alloys I , 1984 , 343
Copyright
Copyright © Materials Research Society 1985

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Footnotes

*

The research is supported by a grant from NASA Lewis Research Center, Program Manager Dr. J. D. Whittenberger.

References

REFERENCES

1. Clarke, R. W., and Whittenberger, J. D., Thermal Expansion 8, Han, T., Editor, Plenum Press, N. Y., 1984, pp. 189–196.Google Scholar
2. Marx, J., Rev. Sci. Instr. 22, 503–509 (1951).Google Scholar
3. Robinson, W. H. and Edgar, A., Institute of Electrical and Electronics Engineers Transactions on Sonics and Ultrasonics, SU-21, No. 2, 98–105 (1974).Google Scholar
4. Granato, A. and Luecke, K., J. Appl. Phys. 52, 7136–7142, (1981).CrossRefGoogle Scholar
5. Whittenberger, J. D., private communication (1985).Google Scholar
6. Ho, K. and Dodd, R. A., Scripta Met. 12, 1055 (1978).CrossRefGoogle Scholar
7. Neuman, J. P., Chang, Y. A. and Lee, C. M., Acta Met. 24, 593–604 (1978).CrossRefGoogle Scholar
8. Parthasarathi, A. and Fraser, H. L., Phil. Mag. 50, 89–100 (1984).Google Scholar