X-ray diffraction techniques were used to study plastic deformation in polycrystalline Ag-30at%Cd under tensile loading. The positions and shapes of all (hkl) reflections were recorded, using a parafocusing arrangement, up to a maximum true strain of 0.265. The effects on peak displacements, caused by stacking faults and by macroscopic strains normal to the surface, were distinguished. The longitudinal true stress in the surface layer, evaluated by least-squares analysis, was smaller than the macroscopic flow stress by an approximately constant amount over the entire strain range (in accord with previous observations of a stress gradient near to a free surface). The apparent rate of work hardening in the surface was equal to that for the specimen as a whole. The stacking-fault probability was an approximately linear function of strain and attained a maximum value of 7 x 10-3. Fourier analyses were performed on the profiles of (111)-(222) and (200)-(400) pairs of reflections. The twin fault concentration was found to be negligibly small. The particle size and microstrain parameters were compared with values for cold-worked filings of the alloy. These results yielded a stacking-fault energy of 6.1mJ/m2.

X-Ray Diffraction Study of Tensile Deformation in a Bulk Polycrystalline Ag-30at%Cd Alloy. H.A.Davies, C.N.J.Wagner: Journal of Materials Science, 1972, 7[1], 105-14