主催: 一般社団法人 日本機械学会
会議名: 日本機械学会 関東支部第29期総会・講演会
開催日: 2023/03/16 - 2023/03/17
The effects of applied current density on the growth of extrusion formed by persistent slip bands (PSBs) and the defects in PSB were investigated. The cyclic plastic strain within a PSB causes extrusions and intrusions, called persistent slip markings, to appear on the surface. A crack initiates at the tip of the intrusion. Fatigue tests were performed while applying current every 2000 cycles. The current density conditions are 60 A/mm2 and 120 A/mm2. The height of the extrusion before and after current application was observed by atomic force microscopy. In the case of 60 A/mm2, the growth rate of extrusion was suppressed and electrical resistivity decreased. On the other hand, in the case of 120 A/mm2, the growth rate was not suppressed and there was no change in electrical resistivity. The growth of extrusion was suppressed as the vacancy concentration decreased. The experiment suggested that there is an optimum value for current density.