THE DEFORMATION OF PARTICLE-CONTAINING ALUMINUM SINGLE-CRYSTALS

Single crystals of (001)[110] orientation of aluminium silicon alloys containing second-phase particles have been deformed in channel die compression. The crystals deform to produce two complementary stable orientations close to the ideal ''copper'' components (112)[111BAR] and (112BAR)[111]. This behaviour is similar to that of single crystals of pure aluminium of the same orientation, although the scale of the microstructure is coarser in the present case. In the vicinity of the particles, deformation zones containing highly misoriented material of the orientation of the complementary copper component are found. It is shown that this behaviour is consistent with a model in which the presence of the particle results in the suppression of slip on certain slip systems in regions adjacent to the particle.