Abstract
Preannealed, predeformed, and polygonized polycrystalline nickel samples are loaded by ultrasound in liquid helium and liquid nitrogen and at RT. Ultrasonic stress amplitudes are sufficient for multiplication of structure imperfections. Defect structure changes are studied using the coercive force technique and the electrical resistivity technique. It is established that the coercive force of nickel is determined principally by the dislocation distrubition. A conclusion is made concerning a probable mechanism of point defect generation under the ultrasonic loading. [Russian Text Ignored].
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