Internal Friction and Young's Modulus of Cold-Worked Copper Single Crystals

Abstract

The internal friction and Young's modulus of single crystals of copper were measured as a function of strain amplitude after they were subjected to various amounts of cold work and different annealing treatments. It was found that the position of the peak in the internal friction versus cold-work curve was dependent upon the strain amplitude of the measurement. No minimum in the Young's modulus versus cold-work curve was found as contrasted with Lawson's result for polycrystalline copper. A minimum was found in the internal friction versus annealing time curve, and a maximum was found in the corresponding Young's modulus curve. The results are semiquantitatively explained using a dislocation model.