Effect of Residual Thermal Stresses on Fracture Behavior and Mechanical Properties of Al sub 2 O sub 3/Ni Cermets

Author(s)

Guo Jin Li
Da Ming Chen
Xiao Xian Huang
Jing Kun Guo

Document Type

Article

Subject Area(s)

Mechanical Engineering

Abstract

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.

Publication Info

Postprint version. Published in Journal of Materials Engineering, Issue 12, 2002, pages 36-38.

Rights

© Journal of Materials Engineering, 2002, Springer

Li, G., Chen, D., Huang, X., Guo, J. (2002). Effect of Residual Thermal Stresses on Fracture Behavior and Mechanical Properties of Al sub 2 O sub 3/Ni Cermets. Journal of Materials Engineering, 0(12), 36-38.