Document Type


Subject Area(s)

Mechanical Engineering


Effect of residual thermal stresses on fracture behavior and mechanical properties of Al2O3/Ni cermets was qualitatively explained by using theory on residual thermal stresses. When Ni particles are located within Al2O3 grains or Ni content is relatively low, tensile stresses are exerted at Al2O3-Al2O3 grain boundary. While fracturing, intergranular fracture is easily produced. When Ni particles are dispersed at Al2O3 grain boundary or Ni content is relatively high, compressive stresses are exerted at Al2O3-Al2O3grain boundary. While fracturing, transgranular fracture is easily produced. In general, intergranular fracture model is favorable to enhancement of fracture toughness, and transgranular fracture model is contributed to improvement of bending strength.