Microscopic mechanism of grain refinement during wear process in single crystals

为了研究磨损过程中晶界的形核和发展，对单晶试样磨损面附近的显微组织进行了分析。据发现，包括在远离磨损表面的区域中的小角度边界是由于从表面引入的位错的重排而产生的。平行于磨损表面的大角度晶界的晶界特征分布强烈依赖于单晶的取向。从围绕垂直于磨损方向的轴发生的晶格旋转来理解单晶中高角度边界的特征性的α值分布。

In order to investigate nucleation and development of grain boundaries during wear process, microstructures near the worn surface of single crystal specimens were analyzed. It is found that low-angle boundaries included in the area distant from the worn surface were generated as a result of rearrangement of dislocations which were introduced from the surface. Grain-boundary character distribution of high-angle boundaries parallel to the worn surface depended strongly on orientation of the single crystals. The characteristic Σ-value distribution of the high-angle boundaries in the single crystals was understood from the lattice rotation occurring around the axis which is normal to the wear direction.