Deformation Twinning Induced High Tensile Ductility of a Gradient Nanograined Cu-Based Alloy

We investigated the tensile properties of gradient nanograined Cu and CuAl samples prepared by plastic deformation. Tensile tests showed that the gradient nanograined Cu-4.5Al sample exhibits a uniform elongation of similar to 22% without any cracks, while the uniform elongation of the gradient nanograined Cu sample is only similar to 18%. Numerous mechanical twinning retards the softening of the nanograins and accommodates a high tensile ductility in the gradient nanograined Cu-4.5Al sample. This work indicates that mechanical twinning is a potential deformation mechanism to achieve high tensile ductility of nanograined materials.

Automated summary

The tensile properties of gradient nanograined Cu and CuAl samples prepared by plastic deformation were investigated, and it was found that the Cu-4.5Al sample showed a higher uniform elongation without cracks. Mechanical twinning plays a significant role in achieving high tensile ductility of nanograined materials.