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Dislocation Density Determinations in Composites

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Abstract

This paper analyzes measurements of the strain amplitude dependence of internal friction for several metal matrix composites (1100 Al, 2124 Al, and 6061 Al reinforced with SiC) to determine the concentration of dislocations that were mobile during low strain (<10−4 ultrasonic tests. The apparatus used was the PUCOT (Piezoelectric Ultrasonic Composite Oscillator Technique) at room temperature and at 80 or 100 kHz. Two approaches to the analysis are considered: the Granato-Luecke (G-L) theory of dislocation damping for 0 K (GL0K), and the G-L theory for high temperatures (GLHT).

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References

  1. A.V. Granato and K. Luecke, “Theory of Mechanical Damping Due to Dislocations,” Journal of Applied Physics, 27 (6), 1956, pp. 583–593.

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  2. Donald R. Askeland, The Science and Engineering of Materials, pp. 507–517; Brooks/Cole Engineering Division, Monterey, CA, 1984.

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  3. A.V. Granato and K. Luecke, “Application of Dislocation Theory to Internal Friction Phenomena at High Frequencies,” Journal of Applied Physics, 27 (7), 1956, pp. 789–805.

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  4. A.V. Granato and K. Luecke, “Temperature Dependence of Amplitude-Dependent Dislocation Damping,” Journal of Applied Physics, 52 (12), 1981, pp. 7136–7142.

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  5. R.J. Arsenault and R.M. Fisher, “Microstructure of Fiber and Particulate SiC in 6061 Al Composites,” Scripta Metallurgica, 17, 1983, pp. 67–71.

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Authors
  1. J. T. Hartman Jr.
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  2. K. H. Keene
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  3. R. J. Armstrong
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  4. A. Wolfenden
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Additional information

James T. Hartman, Jr., received his B.S. in mechanical engineering from Southern Methodist University in 1980. He is currently working towards a M.S. in mechanical engineering at Texas A&M University. Mr. Hartman is also a Student Member of TMS.

Keith H. Keene received his B.S. in mechanical engineering from the University of Arkansas in 1984. He is currently working on a M.S. in mechanical engineering at Texas A&M University. Mr. Keene is also a Student Member of TMS.

Randy J. Armstrong is currently working towards a B.S. in mechanical engineering at Texas A&M University. He is also a Student Member of TMS.

Alan Wolfenden received his Ph.D. from the University of Liverpool in 1965. He is currently a full professor in the Mechanical Engineering Department at Texas A&M University.

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Hartman, J.T., Keene, K.H., Armstrong, R.J. et al. Dislocation Density Determinations in Composites. JOM 38, 33–35 (1986). https://doi.org/10.1007/BF03257867

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