Phonon Scattering by Point Defects in Copper Alloys
The strength of the phonon scattering by solute atoms in four copper alloy systems has been calculated from the values of the lattice thermal conductivities of these metals measured between 1.5 and 55 K. This analysis shows that the point defect scattering depends both on the difference between the masses of the copper and solute atoms and on the amount of lattice distortion produced by the addition of the solute atoms. A microscopic theory which includes the effects of the distortion as the dilation of the lattice about the solute gives a rough quantitative account of the experimental results and predicts the relative scattering strengths of four solutes — Sn, Al, Ge, and Ni. A good correlation between the strength of the phonon scattering rate and the change in the velocity of sound in these alloys is observed.
KeywordsPoint Defect Copper Alloy Lattice Distortion Solute Atom Phonon Scattering
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