The Diffraction Pattern of Cold Worked Metals: II Changes in Integrated Intensity

Measurements have been made, using a Geiger counter spectrometer, of the changes produced by cold work on the integrated intensities in the Debye-Scherrer spectrum of aluminium. It is shown that cold work reduces the integrated intensity of all reflections, this decrease being exactly compensated by a rise in the diffuse background scatter, so that the total reflected intensity is unchanged. These results are at variance with those of previous workers, but the discrepancy can be readily explained by the absence of a correction for extinction in previous work. Brief reference is made to measurements of line width and it is shown that the results support the dislocation theory of plastic deformation.