Microstructure and mechanical properties of a directionally solidified Al2O3/Y3Al5O12/ZrO2 hypoeutectic in situ composite
Source abstract
Abstract
Abstract Directionally solidified ternary Al 2 O 3 /Y 3 Al 5 O 12 (YAG)/ZrO 2 hypoeutectic rod composites were successfully fabricated by the laser zone remelting technique. The microstructure and mechanical properties of the composite were investigated. The microstructure presented a complex three-dimensional network structure consisting of fine Al 2 O 3 (41 vol.%) and YAG (49 vol.%) phases, with smaller ZrO 2 (10 vol.%) phases partially distributed at the Al 2 O 3 /YAG interfaces. The irregular growth behavior in the hypoeutectic was revealed. The hardness and fracture toughness at ambient temperature were measured to be 17.3 GPa and 5.2 MPa m 1/2 , respectively. The toughness enhancement in comparison with previous binary Al 2 O 3 /YAG composites was mainly attributed to the refined microstructure, and crack deflection, branching and bridging. Moreover, the residual stresses, generated by different thermal expansion coefficients of the component phases, also importantly contributed to the improved toughness. Correlations between the addition of the third component ZrO 2 and the microstructure and properties were discussed as well.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (44)
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