Faculty of Engineering, Okayama University Acta Medica Okayama 0475-0071 36 1 2001 Observation of Orientation Change During Plastic Deformation of Polycrystalline Copper by EBSD Method 1 6 EN Ryouji Kondou Takeji Abe Naoya Tada Ichiro Shimizu 10.18926/46995 Change in crystal orientation and strain of individual grains during tensile plastic deformation are studied to clarify on the microscopic deformation behavior of polycrystalline copper. The orientation of grain is measured by electron backscatter diffraction (EBSD) technique in the scanning electron microscope. The principal strain of grain is also measured by obtaining the approximated ellipse of strain distribution. The deformation of grains dependent on their initial orientation and the rotation of the principal strain during uniaxial tension are clarified. No potential conflict of interest relevant to this article was reported.

Faculty of Engineering, Okayama University Acta Medica Okayama 0475-0071 35 1-2 2001 Microscopic Observation of Plastic Deformation of Polycrystalline Aluminum by Laser Scanning Microscope 1 8 EN Takeji Abe Ichiro Shimizu 10.18926/15344 Free surface of polycrystalline metal becomes roughened after plastic deformation. The surface roughening is closely related to the inhomogeneity of polycrystalline metals, that is, to the inhomogeneous plastic deformation of respective grains. In the present study, inhomogeneous deformation on the free surface of polycrystalline aluminum specimen during uniaxial tension is studied. The inhomogeneous deformation of grains in the central area of the free surface of specimen is observed by the laser scanning microscope, while the inhomogeneous deformation perpendicular to the surface is studied by the laser scanning microscope as well as the stylus measuring instrument. It is shown that the surface roughness and the strain of respective grains increase with the applied strain. Discussions are made on the change in the surface roughness, the strain in each grain and the slip-line angles with the applied strain. No potential conflict of interest relevant to this article was reported.

Faculty of Engineering, Okayama University Acta Medica Okayama 0475-0071 39 1 2005 Microscopic Surface Change of Polycrystalline Aluminum duringTensile Plastic Deformation 7 15 EN Xiaoqun Wang Takeji Abe Naoya Tada Ichiro Shimizu 10.18926/14135 Roughening on free surface of polycrystalline metal during plastic deformation is closely related to the inhomogeneous deformation in the respective grain at the surface. Uniaxial tensile tests are carried out on annealed pure aluminum sheet specimens with various averaged grain sizes. The roughening is measured by a 3-dimensional stylus instrument to examine the roughness change in both sides of specimen surfaces at each strain. The irregularities on one side are reversed on the backside, when the averaged grain size is as large as the thickness of the specimen. Discussions are made on the relation between the surface shapes of both sides adopting the cross correlation factor. The strains of respective grains are also measured from the grain boundary shape before and after plastic deformation. There are some deviations in the strains of the grains and their standard deviation increases with the applied strain. No potential conflict of interest relevant to this article was reported.

Acta Medica Okayama 1994 多結晶金属材料の塑性変形に伴う自由表面あれの研究 EN No potential conflict of interest relevant to this article was reported.