単結晶材料の微小硬度の上昇　　シリコンとアルミニウムの場合

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  • Increase of Microhardness of Single Crystals. Cases of Silicon and Aluminum.
  • タンケッショウ ザイリョウ ノ ビショウ コウド ノ ジョウショウ シリコン ト アルミニウム ノ バアイ

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説明

Relation of microhardness to the indentation depth has been experimentally investigated for two single crystalline materials of silicon and aluminum. For the case of silicon, the microhardness is strongly affected by the coupled behavior between phase transition induced by the hydrostatic pressure from the diamond structure to the β-tin and dislocation emission. Increase of hardness at the depth less than about 2μm is observed at the case of aluminum, which has already been reported for the other ductile materials discussing with the evolution of the dislocation network. The onset of the increase is, however, dependent on the surface characterization. The elastic constants estimated from the unloading curves don't show the drastic change according to the indentation depth. The assumption on a paraboloid of revolution as an indenter in the process defining the hardness is also verified and its error is found to be small within the present measurable range.

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