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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

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