Fabrication of Nanowire Specimen with Controlled Shape and Crystallographic Orientation and Development of Tensile Testing Method based on Mechanical Design of Specimen

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A new tensile test method was developed and was applied to a single crystalline gold nanowire with a square section of 189 nm. The nanowire, which was mounted on a lozenge-shaped silicon frame, was pulled by a compressive load on the top face of the frame. Although the applied load increased monotonically in the early stages of deformation, it dropped rapidly at a certain displacement. In-situ TEM observation indicated that the rapid decrease was due to crystallographic slip generation. The critical resolved shear stress at yielding was evaluated to be 325.8 MPa, which was about 600 times larger than that of bulk.