Prof. Ichiro Shimizu Profile

Prof. Ichiro Shimizu

at Okayama Univ of Science

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Proceedings Article | 4 March 2015 Paper

Alloy composition dependency of plastic deformation behavior in biaxial compressions of Ti-Nb alloys

Ichiro Shimizu, Kazuki Hisada, Shinichi Ishikawa, Yoshito Takemoto, Naoya Tada

Proceedings Volume 9302, 930210 (2015) https://doi.org/10.1117/12.2077324

KEYWORDS: Titanium, Niobium, Dysprosium, Metals, Crystals, Chemical elements, Iron, Molybdenum, Anisotropy, Systems engineering

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Crystal structure of titanium alloy changes from alpha (hexagonal close-packed) to beta (body centered cubic) with increase of beta stabilizer content. This change of structure strongly influences on the plastic deformation behavior of titanium alloys, because it not only induces changes of slip systems but also activates martensitic transformation and deformation twinning. However, most of past studies on titanium alloys have been focused on the development of specific functionalities induced by alloy designing, and few research works have been reported on metal workability under multi-axial stress conditions, which is key factor to apply titanium alloys for engineering products. In this study, uniaxial and biaxial compression tests of titanium-niobium alloys with various niobium contents have been performed to clarify the influence of beta stabilizer content on the plastic behavior under compressive stress conditions. The titanium-niobium alloys were solution treated and then quenched from beta region to obtain metastable structures. The resultant stress-strain relations together with microscopic observations of texture revealed that the influence of niobium contents on the predominant plastic deformation mechanisms and thus on the hardening phenomena. The equi-plastic work contours obtained by uniaxial and biaxial compression tests also implied the crystal structure dependency of anisotropic hardening, which was evaluated quantitatively by means of Hill's anisotropic yield criterion. The results will provide information on the versatile constitutive relations of titanium alloys containing beta stabilizer elements, that is important to prove the performance of products manufactured by compressive metal working processes such as forging and extrusion.

Proceedings Article | 15 April 2010 Paper

Evaluation of orientation-dependent geometry of micro triangular indentation on grain of polycrystalline α-titanium

I. Shimizu, N. Tada, T. Ishida

Proceedings Volume 7522, 75221Q (2010) https://doi.org/10.1117/12.851502

KEYWORDS: Titanium, Crystals, Metals, Finite element methods, Microscopes, Crystallography, Diffraction, Optical microscopes, 3D modeling, Surface finishing

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In microindentation testing, an indentation size is smaller than the average grain size of industrial polycrystalline metals, so that the indentation shape is affected by the crystallographic orientation of grain on which the indentation is imposed. Hence, clarification of the relation between the crystal orientation and the indentation shape leads to the possibility of estimating the crystal orientation by microindentation testing. In the present study, influences of crystal orientations upon indentation shapes on grains of polycrystalline titanium were investigated. The crystal orientations of grains were measured by an electron backscattered diffraction method, and indentation tests with a triangular pyramidal indenter were performed on the grains. The indentation shapes were thus observed by a laser-scanning microscope and an optical microscope. The results revealed that the direction of the most bulged position of edges from the apex of triangular indentation agreed well with an a-axis direction. It was also found that deviation of the indentation edge from the ideal one became smaller with larger angle of inclination of c-axis for the sample surface, owing to the limited slip direction of titanium. Those results suggest the possibility to evaluate the crystal orientation of titanium grain directly from the observed indentation geometry.

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