激光区熔定向凝固Al2O3/Y3Al5O12(YAG)

With the high-energy laser as heat resource for directional solidification, Al2O3/(Y3Al5O12)YAG eutectic ceramic was rapidly prepared from melt in this paper. The relationship between the eutectic microstructure and the processing parameters is studied, and the mechanical property of the composite is preliminarily investigated. The results show that: (1) The scanning rate and power density strongly affect the eutectic microstructure. With the processing parameters adjusted properly, the binary Al2O3/YAG has an uniform and homogeneous lamella microstructure , in which single crystal Al2O3,single-crystal YAG are three-dimensionally and continuously reticular connected and finely coupled without grain boundaries ,colonies and amorphous phases between interfaces. Eutectic spacing reduces with scanning rate’s increasing and is only around 1-2 um. (2) The maximum hardness reaches 19.84Gpa and the room fracture toughness were attained for 3.72 MPa.m1/2 by vickers indentation method.