Effect of pre-strain on the dislocation relaxation in zinc single crystal
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The ultrasonic absorption,α, in a zinc single crystal was measured as a function of temperature along three different orientations. The effect of different amounts of pre-strain on the absorption is investigated. It has been found that the energy,W, activating the relaxation process is independent of the amount of pre-strain, while the attempt frequency,v0, and the temperature of the absorption peak,Tm, are pre-strain dependent. The relaxation strength indicates a slight maximum in the considered range of pre-strain. Seeger theory has been used to explain some features of the experimental data, however, all the existing theories fail to explain the dependence of the parametersW andv0 on the orientation.
KeywordsPolymer Experimental Data Zinc Absorption Peak Relaxation Process
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