X-Ray Study of the Effect of Solute Atoms on Deformation Stacking Faults in Face-Centred Cubic Solid Solutions

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X-ray study of copper-nickel alloys pulverized by a ball mill and a stamp mill was carried out. Line peak shifts due to deformation stacking faults were observed by a Geiger counter spectrometer, and the stacking fault probability was calculated. The density of dislocation was estimated from the line broadening. From these experiments it was seen that the peak shift (or stacking fault probability) and the density of dislocation increased with the increase in solute content, reaching a maximum at 50〜50 composition. The stacking fault energies of copper-nickel alloys were estimated from the equation proposed by Cottrell as a function of the solute content, which showed a downward concave curve ; for example, the stacking fault energies of copper, copper 30 per cent-nickel and nickel were 30, 50 and 100 erg/cm^2 respectively. In order to investigate on the segregation of solute atoms around the boundaries of stacking faults, small angle scattering experiments were carried out with copper-aluminium alloys severely cold-rolled at room temperature. And some observations on line profiles of the diffraction patterns were also made with powder samples of copper-aluminium, copper-nickel and copper-zinc alloys in order to see the effect of segregation of solute atoms on the diffractions. After all, it was concluded that in face-centred cubic solid solutions the solute atoms concentrated around faulted layers even at room temperature.
東北大学の論文