Deformation mechanism in ?Cu-Al single crystals and bicrystals under scratching with pyramidal indentor

Abstract

In order to elucidate the deformation mechanism of materials in abrasive wear process, scratching tests were carried out on the (111) face of Cu-14.7 at % Al single crystals and Σ13 b bicrystals with pyramidal indentor. In the scratching on the single crystals three kinds of scratching directions, [11 ¯2], [¯1¯12] and [¯110], were chosen. In the case of bicrystals, the [1 ¯21] and [1¯10] directions were adopted. After scratching the dislocation structure, slip trace patterns and surface profiles across the scratched track were examined. In addition, the dislocation distributions inside the crystals were revealed by successively removing thin layers and developing etch pits on the exposed surface.