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The composites were prepared by ball-milling ZrO_2(3%Y_2O_3) and γ-Al_2O_3 nanoparticles, pressing unidirectionally, cold-pressing isostatically and pressurelessly sintering in air. The phases of ZrO_2 in composites were examined by X-ray diffraction. The microstructure of Al_2O_3/3Y-TZP composites was observed by scanning electron microscope (SEM) and transmission electron microscopy (TEM) respectively. The X-ray analysis reveals that ZrO_2 of both surface and fracture surface is mainly t-ZrO_2. The SEM image shows that there are some intragranular particles in large granulars. The fracture toughness K_ 1c of Al_2O_3/70%ZrO_2(3%Y_2O_3(mole fraction)) composite tested by single-edge notched bending is 13.5 MPa·m 1/2. Being toughened by the ferroelastic domain switching and the intragranular microstructure explains high toughness of the composite.
The composites were prepared by ball-milling ZrO 2 (3% Y_2O_3) and γ-Al_2O_3 nanoparticles, pressing unidirectionally, cold-pressing isostatically and pressurelessly sintering in air. The phases of ZrO_2 in composites were examined by X-ray diffraction. The microstructure of The X-ray analysis reveals that ZrO 2 of both surface and fracture surface is mainly t-ZrO 2. The SEM image shows that there are toughened by the ferroelastic (both fractional) are some intragranular particles in large granulars. The fracture toughness K_lc of Al_2O_3 / 70% ZrO_2 (3% Y_2O_3 fraction) was tested by single-edge notched bending is 13.5 MPa · m 1/2. domain switching and the intragranular microstructure explains high toughness of the composite.