斜め切断法によるα黄銅表面加工層の研究

概要

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Mutual wearing, super-finishing and scratching of α-brass were made. The damaged layers were studied by revealing dislocation etch pits. Main results are as follows : (1) The thickness of damaged layers after wearing or super-finishing are extraordinary large compared with other data; in case of mutual wearing, 600μ, (the pressure 300g/cm^2,without lubricant), and in case of super-finishing, for example, 186∿257μ (the pressure 1kg/cm^2,grinding stone Lapo Cr_2O_3,150rpm, with the lubricant of light oil). (2) The depth of the damaged layer increases with the working speed and with the pressure, in case of super-finishing. However, the hardness at the surface is higher than that of the bottom of a damaged layer. (3) Twin boundary migration were observed after scratching. (4) The density of dislocations changes from grain to grain in all cases. Grains with a high dislocation density have a {111} or {100} plane, which is almost parallel to the surface of a specimen, in case of wearing and super-finishing. (5) In all cases, dislocation densities do not depend on the depth from the surface. (6) The boundary between matrix and a damaged layer is distinct. (6) Arrangements of dislocations are almost the same in every case.
山梨大学の論文