[0 0 0 1]-oriented alumina ceramics with texture fractions (F0001) ranging from ∼9.6% to 93.6% were prepared by templated grain growth (TGG) of nanoscale matrix. Ceramic density directly controls F0001. Impingement of textured grains can be observed at F0001 ≥ 58.4%. When fracturing samples along [0 0 0 1], the interfaces between basal surfaces of the impinged textured grains provide a favorable path for crack deflection, and the deflection distance becomes longer with increasing F0001. As a result of both crack defection and high density, optimum fracture toughness ∼4.6 MPa.m1/2 and flexural strength ∼589 MPa were achieved at F0001 = 93.6%, which are much higher than those obtained in the randomly oriented counterpart. This work can provide guidelines for the design and synthesis of novel structural ceramics with improved performance.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering