Twin boundaries generally contribute significantly to the damping of a twinned crystal. In an In-19.1 at.% Tl single crystal the damping gives rise to auto modulation if the internal friction studies are performed in the 10 Hz frequency range, with a strain amplitude larger than 0.05 and at temperatures lower than 10°C. The frequency of the auto modulation is about 60 times slower than the frequency with which the reed type sample is driven. The auto modulation frequency has a maximum at -6 C and is characterized by an activation energy of 29 kJ/mol (7 kcal/mol). This maximum can be understood by applying Lücke and Stüwe, and Cahn's theory of impurity diffusion-controlled grain boundary motion to the motion of twin boundaries. On the basis of this analysis, it is suggested that the twinning pseudo elasticity in InTl comes about because at low temperatures the Tl atoms in the vicinity of the core of the twin boundary cannot relax to their equilibrium configuration. © 1983.


Materials Science and Engineering

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Article - Journal

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Publication Date

01 Jan 1983

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