Abstract
The plastic properties at room temperature of extended copper crystals alloyed with aluminium, germanium and silicon were examined as a function of crystal orientation, alloy concentration and nature of solute. A strong orientation dependence was observed on the gross shape of the shear stress/shear strain diagram in all of the alloy crystals examined. In those crystals exhibiting a well-defined two-stage hardening curve, the extent of shear associated with stage I and the shear hardening coefficients of stages I and II are significantly dependent on orientation, nature and concentration of solute. On the other hand, the shear stress defining the onset of stage II is constant and independent of crystal orientation. Variations in the gross shape of the shear stress/shear diagram and in the parameters defining the two-stage hardening curve are correlated with changes in slip line development. No evidence of Luders band propagation, kink band development or twinning, was observed.
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