OS1609 摩擦により形成される微視的組織のEBSD分析(OS16-2 微視的な視点からの変形と強度,OS-16 ナノ・マイクロの視点からの変形と破壊の力学)

概要

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To investigate the effect of multi-directional wear on subsurface microstructure, sliding wear tests on copper single crystals having (110) surface were conducted. In addition to a conventional sliding wear test, the single crystal was subjected to sliding wear along two directions which intersect at 90° with each other. The microstructures formed below the worn surface were composed basically of two regions in both cases: equiaxed fine grains were seen just below the worn surface, and below them long grain boundaries parallel to the worn surface were generated. From electron backscatter diffraction (EBSD) analysis on the single crystal subjected to the single-directional wear, most of generated high-angle boundaries which were parallel to the worn surface were classified into tilt boundaries where rotation axis is parallel to worn surface. This kind of the tilt grain boundary formation could be understood in terms of edge dislocation emission from the worn surface. On the other hand, through the two-directional wear, formation of twist boundaries was recognized in addition to the tilt boundaries. It is expected that activities of screw dislocations were involved during the two-directional wear to form the twist boundaries.
一般社団法人日本機械学会の論文
2011-07-16