MgO・xAl2O3単結晶の硬度の異方性及び荷重依存性
1991 年 99 巻 1155 号 p. 1079-1087
詳細
1991 年 99 巻 1155 号 p. 1079-1087
The Knoop microhardness profiles were determined on the (100) of MgO⋅1Al2O3 and MgO⋅3Al2O3 single crystals. The ‹100› were the hardness maxima and the ‹110› the hardness minima for both compositions. The nonstoichiometric spinel was the most anisotropic, but the stoichiometric MgO⋅1Al2O3 crystal had the larger load-independent “true” hardness for all indentation orientations on the (100). The hardness profiles were found to be dominated by the {111}‹110› primary slip systems from comparison with the calculated ERSS diagrams for the crystals, although differences in the profile shapes were evident. The nonstoichiometric spinel exhibited the greater indentation load/size effect in terms of the Meyer's Law exponent.
