Tensile behavior of micro-sized specimen made of single crystalline nickel

This paper proposed the effect of crystal anisotropy of micro-specimens evaluated by a micro-tensile. The micro-gripper and specimen were fabricated from a commercially available diamond-tip indenter and single crystal Ni disk, respectively, by focused ion beam. The stress-strain curves obtained from the micro-tensile test showed a few load drops, which is similar to serration contributed by occurrence of slip lines observed on surface of the specimens. Moreover, the difference in crystal orientations of < 111 > and < 223 > along the loading axis on stress-strain behaviors is evaluated. The results indicated the crystal anisotropy by Schmid factor is the same as the deformation behavior of face-centered-cubic bulk metals. Thus, the micro-tensile testing method used in this experiment successfully showed the effect of crystal anisotropy in micro-scale. (C) 2015 Elsevier B.V. All rights reserved.