Abstract
Abstract Al2O3/Y3Al5O12(YAG) eutectic ceramic with the dimension of 180 mm × 140 mm × 30 mm was firstly grown in vacuum by Horizontal Directional Solidification (HDS) method. Half of the sample was annealed for 100 h at 1973 K in the air. The oxygen vacancies were found to be fully compensated by annealing in X-ray photoelectron spectroscopy. The HDS-Al2O3/YAG eutectic showed no grain growth after longtime annealing treatment and the two constituent phases were three-dimensionally interpenetrated without grain boundaries. The average eutectic interspacing is 3.1 ± 1.8 μm. The density ρ, hardness Hv, fracture toughness KIC, compression stress σc (to 8% strain) and flexural stress σf of the as-grown and annealed samples were measured at room temperature, the values changing from 4.26 g/cm3 to 4.39 g/cm3, 16.04 ± 0.75 GPa to 16.79 ± 0.45 GPa, 2.69 ± 0.06 MPa m1/2 to 3.07 ± 0.05 MPa m1/2, 1188 MPa–1278 MPa and 320–340 MPa to 345–370 MPa, respectively. The crack arrest, deflection and branching enhanced the resistance of crack propagation after Vickers experiments. The flexural fracture surface of the as-grown samples shows mainly transgranular fracture, while mixed fracture of intergranular and transgranular is observed for the annealed samples.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
