ゴス方位珪素鋼単結晶にコーティングしたTi膜の塑性変形後の形態観察

概要

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In order to clarify the crack morphology after 180°bend-forming and bulge press-forming of Ti films deposited on (011)[100] single crystal of silicon steel, Ti coating by the hollow cathode discharge (HCD) method was done on polished single crystal sheets, and then the Ti-coated samples were 180° bend-formed or bulge press-formed, and then observed by the scanning electron microscope. Ti-coated silicon steel of (011)[100] single crystal sample showed no distinctive crack in Ti films on steel sheet, on which slip lines at intervals of 1∿5μm to the [1210]_<Ti> direction could be observed in a rectangular-like morphology 10∿25μm in width and 15∿60μm in length. The slip morphology of bulge press-forming of Ti films was different from that of 180°bend-forming ; the former process produced slips and kinks but no distinctive cracks due to the creation of of a complicated slip systems arising from areal deformation, and the latter process produced fine single slips due to the creation of a single system arising from unidirectional deformation.
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