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

• Crystal anisotropy of micro-specimens was evaluated by a micro-tensile test.
• The micro-gripper was made from a commercially available micro-indenter by FIB.
• The micro-specimens were made from a single crystal Ni disk by FIB.
• The results show crystal anisotropy corresponded to Schmid factor of each specimen.

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.

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