X-Ray Diffraction Rings from Deformed Solid Metal and Metal Powders

Abstract

THE changes in crystalline texture of metals subjected to plastic deformation can be studied by following the increase in diffusion of the X-ray reflexions from the atomic planes. The correct procedure should be always to obtain the reflexions direct from the metal in the normal solid state. But for convenience much work has been based on the circular camera technique, where the test specimen has to be in the form of powder. The metal has been reduced to powder by filing, and measurements made of the breadth and intensity of the X-ray reflexions from the filings. These values have been compared with the breadth and intensity of the reflexions after the filings have been annealed and the effect of deformation thereby removed. The difference has been taken to represent the effect of the cold plastic deformation produced by the action of filing. Then it has been assumed that the same differences would exist between the annealed and plastically deformed state in the solid metal ; also that the theoretical conclusions would be applicable directly to interpretation of the structural changes produced by plastic deformation of the solid metal.