• Fractography as well as fatigue and fracture of 25 wt% silicon carbide whisker reinforced alumina ceramic composite

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/017/06/0893-0910

    • Keywords

       

      Alumina; silicon carbide; whiskers; fatigue; transgranular; intergranular; fracture strength

    • Abstract

       

      Fatigue cracked and fast fractured regions in four-point bend specimens prepared from 25 wt% silicon carbide whisker reinforced alumina composite were examined by scanning electron microscopy. This composite was found to be susceptible to a fatigue crack growth phenomenon similar to that in the case of metallic materials, but with a higher crack growth exponent. In the fatigue region, the alumina matrix failed mainly in a transgranular mode and the whiskers mainly failed with a flat fracture surface but without their pullout. On the other hand, in the fast fracture region, the whiskers failed predominantly by pullout and the alumina matrix failed in a mixed mode with about half in transgranular and the other half in intergranular mode. Thus, to improve the fracture toughness of the material, the grain boundary strength of alumina and the matrix whisker interfacial bonding should be improved. To increase the resistance to fatigue, the fracture strength of the alumina grains should be improved by using finer α-alumina particles and the fatigue strength of the whisker have to be increased by improving the uniformity in distribution of β-SiC whiskers during hot pressing.

    • Author Affiliations

       

      A K Ray1 2 S Banerjee3 E R Fuller1 4 S K Das1 2 G Das1 2

      1. MTE Division, National Metallurgical Laboratory, Jamshedpur - 831 007, India
      2. MTC Division, National Metallurgical Laboratory, Jamshedpur - 831 007, India
      3. Research and Development Centre, SAIL, Ranchi - 834 002, India
      4. Ceramic Division, National Institute of Standards and Technology, Gaithersburg, Maryland - 20899, USA
    • Dates

       
  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.