Abstract
X-ray diffraction line-broadening analysis has been used to measure the residual microstrain in ball-milled copper powder. Residual strain energy has been calculated from the microstrains obtained for different degrees of cold working. The stored energy produces changes in the electrode potential; a comparison has been made between the strain energy, obtained from the X-ray data, and the change of surface free energy, derived from the electrode potential measurements. The relationship between the strain energy and the change in the electrode potential, relative to that of the annealed state, is linear. A slow decrease of the electrode potential of the cold worked specimen takes place with time. This is attributed to the exchange current operating at the surface of the electroce.
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