機械的合金法で製造したＮｉ―１％Ａｌ２Ｏ３合金およびＮｉ―０．５％Ｙ―１％Ａｌ２Ｏ３合金の内部組織と塑性変形機構
(The substructure and plastic deformation mechanism in a Ni-1%Al2O3 alloy and a Ni-0.5%Y-1%Al2O3 alloy produced b)