Plastic Deformation Behavior of Grains in Small Thin Specimen under Tension

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Recently, researches on the mechanical behavior of small-sized material, such as thin wires and films, have been actively done in the field of micro machines and electronic devices. In general, deformation of the small-sized materials is greatly affected by microstructures such as grain boundaries and crystal orientations of grains. The smaller the size of the material becomes in comparison with that of the microstructures, the larger the magnitude of the effect becomes. In this study, tensile tests of metal film or thin plate were carried out on the stage of microscope, and the deformation of grains was observed in situ. The followings were discussed here.I.Tensile test of thin plate of pure titanium using thermal expansion of polycarbonate.II.Tensile tests of pure titanium and polycarbonate by conventional fatigue testing machine for small specimens.III.Tensile tests of thin plate of pure titanium using piezo stage.In the above I, it was confirmed that the tensile test of thin plate of pure titanium was possible using thermal expansion of polycarbonate. The plastic deformation behavior and mechanical properties were discussed. In II, mechanical properties for pure titanium and polycarbonate were obtained by conventional fatigue testing machine for small specimen. The results of I were discussed based on these results. In III, tensile tests of thin plate of pure titanium were carried out on the stage of microscope using piezo stage, and the tensile plastic behavior was observed. The results were compared with those of I and II.