Deformation in αCu-Al Single Crystals due to Impact Scratch

抄録

The subject of sliding friction is of great tribological importance and has been studied extensively on an engineering basis. However, effects of the underlying microscopic factors that control friction and wear have not been elucidated. The present study is a part of the effort relating to sliding deformation under impact and high speed conditions. The method used is to scratch a diamond quadrangular pyramid on the accurately finished (111) crystal face of αCu-Al single crystals using a single pendulum impact testing device. The study was made to examine the appearance of slip patterns and the topographical deformation on the surface caused by scratch. Then, dislocation patterns on the sub-surface exposed by electrolytical polishing were examined. Furthermore, comparisons of the experimental results obtained in the present study with the results obtained under the condition of static scratch were made. From the experimental results, the following conclusions were obtained. Slip traces with the slip systems of the (111) [101] [011], (111) [101] and (111) [011] are observed on the surface after the scratch in the [112] direction. While in the [110] scratch, (111) [101] and (111) [101] slip traces were observed. The curved slip traces which were not observed in the static scratch appeared around the scratched track in each scratch. These slips are active on the crystal {111} faces which have divergent arrangement towards the inside just below at the surface, and on the convergent faces in the deeper region.