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Al 2 O 3 /MgAl 2 O 4  directionally solidified eutectic ceramic (DSEC) rods with Φ 10 mm were prepared with induction heating zone melting (IHZM) method. The phase components of the DSEC were composed of MgAl 2 O 4  phase growing along the preferred orientation 〈311〉 and Al 2 O 3  phases growing along the preferred orientation 〈110〉. In the DSEC, the Al 2 O 3  phase is the matrix phase mixed with part of MgAl 2 O 4  phase and the other part of MgAl 2 O 4  phase forms slice structure. Both the DSEC density and hardness decrease with the increase of the growth rate, due to the increase of micropores in DSEC with the higher growth rate. However, its fracture toughness improved due to the fine interface spacing toughening and the dispersion toughening. The highest hardness and fracture toughness of DSEC are 19.3 GPa and 3.74 MPa·m 1/2 , respectively, the toughening effect could be attributed to the crack deflection and bifurcation hindering the propagation of crack in DSEC.

Microstructure characteristics and mechanical properties of Al 2 O 3 /MgAl 2 O 4 directionally solidified eutectic ceramic