A quantitative experimental study on non-homogenous deformation behaviors of nanocrystalline Ni sheet

A quantitative experimental study on the non-homogenous plastic deformation of fully dense electrodeposited nanocrystalline Ni sheet under a quasi-static uniaxial tensile load was carried out in this paper. The sheet sample exhibited high strength simultaneously with a decrease in tensile strain. To investigate the early failure of the nanocrystalline Ni, the strain fields was quantified with digital image correlation algorithm. Based on the experimental results, the non-homogenous in form of shear bands was analyzed. Some critical points, such as shear band nucleation, broadening process and failure point were recognized. Then the inclination and width of full-developed shear band were discussed quantitatively. Finally, the failure mode, deformation mechanism and some impact factors on the non-homogenous deformation were discussed in detail.