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

Junjie Wang; Nairong Tao

doi:10.3390/nano11092451

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

Nanomaterials (Basel). 2021 Sep 20;11(9):2451. doi: 10.3390/nano11092451.

Authors

Junjie Wang^{1

2}, Nairong Tao¹

Affiliations

¹ Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
² University of Chinese Academy of Sciences, Beijing 100049, China.

Abstract

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 ~22% without any cracks, while the uniform elongation of the gradient nanograined Cu sample is only ~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.

Keywords: ductility; grain coarsening; nanograins; twinning.