αCu-Al合金単結晶および双結晶の四角錐圧子スクラッチによる変形機構

概要

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Scratching tests were carried out on the(111)face of Cu-14.7 at.%Al single crystals and bicrystals with the use of pyramidal indentor. In the scratching on the single crystals three kinds of scratching directions, [112], [112]and[110]were chosen. In the case of bicrystals, the [110]and [110]directions were adopted. After scratching the distribution pattern of the slipped traces and the 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. The conclusions obtained are as follows: (1)The slipped traces on either side of the scratched track are produced more extensively than those around the indented terminal. (2)The swells of the material were caused in front of the scratched track by slips on the{111}faces which diverge downwards. So the width of the scratched track appears narrower than that in the indented terminal. (3)In the scratching which acrosses the grain boundary, the deformation in the surface layer of the crystal is obstructed due to the existence of grain boundary. But the deformation inside the crystal is little influenced by the grain boundary.
社団法人日本材料学会の論文
1995-01-15