αCu-Al単結晶の球状圧子による変形機構
II. 鋼球による摩擦の場合
1990 年 39 巻 437 号 p. 132-137
詳細
1990 年 39 巻 437 号 p. 132-137
αCu-Al single crystals were scratched with a steel ball in various directions in order to clarify the mechanism of the deformation observed in abrasive wear of the finished surface. Microscopic observations of the slip traces and of the scratched track were made on the (111) face scratched in the [211], [211] and [011] directions.
After the (111) face had been scratched, the face was electropolished to remove a thin layer of suitable thickness in order to observe the distribution of the etch pits and slip traces on the exposed surface. This in turn permitted the determination of the distribution of the dislocation density on the cross-section perpendicular to the (111) crystal face.
The conclusions are summarized as follows:
(1) The slip width and slip depth increase in proportion to the load.
(2) The scratched track width and the slip depth are wider for scratches in the [211] direction than for scratches in the [211] direction.
(3) The active slip systems in the scratch can be explained by taking into consideration the stresses produced in the material.
(4) Beyond a certain depth, the effect of the frictional stress produced by the scratch disappears, and only the effect of the normal stress remains.
