An X-ray study of copper-aluminium and copper-nickel alloys was carried out. An asymmetrical line broadening was observed in a copper-aluminium alloy of high concentration of solute atoms but not in copper-nickel alloys. In the case of a copper-18.3% aluminium alloy the shift of the centre of gravity of the (111) diffraction line was estimated to be 0.05°, and interpreted to be due to the segregation of solute atoms and to deformation stacking faults. The effect of the segregation on the diffraction pattern was investigated using the equation by Willis, and as the result, in the case of copper-18.3% aluminium alloy the average scattering factors of the atoms in the normal and faulted layers were different from each other by about 6% after cold-working.
(Received February 27, 1961)
* The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai, Japan.
© 2002 The Japan Institute of Metals
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