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Internal Friction of Cast Graphite-Magnesium Composites

Published online by Cambridge University Press:  22 February 2011

J. H. Armstrong ,
S. P. Rawal  and
M. S. Misra
J. H. Armstrong
Affiliation:
Martin Marietta Astronautics Group, Materials and Structures, Denver, CO 80201
S. P. Rawal
Affiliation:
Martin Marietta Astronautics Group, Materials and Structures, Denver, CO 80201
M. S. Misra
Affiliation:
Martin Marietta Astronautics Group, Materials and Structures, Denver, CO 80201
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Abstract

Internal friction behavior in cast 8-ply [0°1 P55Gr/Mg-0.6%Zr alloy and P55Gr/Mg-1%Mn composites as a function of vibratory strain amplitude was measured at 80 kHz using a Marxtype piezoelectric composite oscillator. Both the matrix and composite exhibited strain amplitude independent internal friction below ε ≈ 10−6, while significant strain amplitude dependence was noted at higher strain levels. A maxima in damping was observed for most of the specimens tested. Heat treatment to enlarge grain size was found to increase both the strain amplitude independent and dependent internal friction of the composite. Strain amplitude dependence of the internal friction, including the existence of the maxima, was explained by the Granato-Lucke (G-L) dislocation internal friction model. Dislocation densities obtained from various TEM images from the fiber-matrix interface were compared to values predicted by G-L theory.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 120: Symposium G – High-Temperature/High-Performance Composites , 1988 , 111
Copyright
Copyright © Materials Research Society 1988

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References

1. Misra, M.S. and LaGreca, P.D.: “Damping Behavior of Metal Matrix Composites,” Vibration Damping 1984 Workshop Proceedings, AFWAL-TR-84-3064, Nov. 1984., p. U-1.Google Scholar
2. Rawal, S.P., Armstrong, J.H. and Misra, M.S.: “Interfaces and Damping in Metal Matrix Composites,” Martin Marietta Report #MCR-86-684, prepared for the Office of Naval Research, December 1986.Google Scholar
3. Walsh, D.F., Jensen, J.W. and Rowland, J.A.: “Vibration Damping Capacity of Various Magnesium Alloys,” U.S. Bureau of Mines Report #6116, 1962.Google Scholar
4. Robinson, W.H. and Edgar, A.: PEL Technical Note No. 204, NZ, DSIR, 1970 (unpublished).Google Scholar
5. DiCarlo, J.A. and Maisel, J.E.: “High-Temperature Dynamic Modulus and Damping of Aluminum and Titanium Matrix Composites,” Advanced Fibers and Composites for Elevated Temperatures, Ahmad, I. and Noton, B.R., eds., Conference Proceedings, Metallurgical Society of AIME, p. 55, 1979.Google Scholar
6. DiCarlo, J.A. and Maisel, J.E.: “Measurement of the Time/Temperature-dependent Dynamic Mechanical Properties of Boron/Aluminum Composites,” Composite Materials: Testing and Design (Fifth Conference), ASTM STP 674, Tsai, S.W., ed., American Society for Testing and Materials.Google Scholar
7. Fredrickson, J.W.: “Damping Capacity of KIA,” Dow Chemical Corporation Report #MT17753-Final, Dec. 1958.Google Scholar
8. Sugimoto, K., Niiya, K., Okamoto, T. and Kishitake, K.: “A Study of Damping Capacity in Magnesium Alloys,” Trans JIM, 18, pp 277–288, 1977.Google Scholar
9. Granato, A. and Lucke, K.: “Theory of Mechanical Damping Due to Dislocations,” J. Appl. Phys., 1956, vol.27, p. 583.CrossRefGoogle Scholar
10. Granato, A. and Lucke, K.: “Applications of Dislocation Theory to Internal Friction Phenomena at High Frequencies,” J. Appl. Phys., 1956, vol.27, p. 789.Google Scholar
11. Rawal, S.P., Armstrong, J.H. and Misra, M.S.: “Damping Characteristics of Cast Graphite-Magnesium Composites,” presented at the American Ceramics Society Conference, Cocoa Beach, FL, January 1988.Google Scholar