J Mater Sci Technol ›› 1996, Vol. 12 ›› Issue (1): 29-34.

• Articles • Previous Articles     Next Articles

Effect of Interfacial Bonding on the Toughening of Al_2O_3/Ni Ceramic Matrix Composites

Xudong SUN(Dept. of Materials Science and Engineering, Northeastern University, Shenyang 110006, China)J.A. Yeomans(Dept. of Materials Science and Engineering, University of Surrey, Guildford, Surrey GU2 5XH, UK)   

  • Received:1996-01-28 Revised:1996-01-28 Online:1996-01-28 Published:2009-10-10

Abstract: The main Iimitation to the toughening of the α-Al2O3/Ni composite is the poor bonding atthe interface. which causes the nickel particles to be pulled-out during crack propagation with-out obvious plastic deformation. A proper control of oxygen content at the Al2O3-Ni interfacecan promote wetting at the intedece, and produce a mechanically interlocked and chemically strengthened intedece, causing most of the nickel particles to be stretched to failure and to expe-rience severe plastic deformation during crack propagation in the composite. Fracture toughnesstesting using a modified double cantilever beam method with in situ observation of crack prop-agation in a scanning electron microscope shows that the composite with the strengthenedinterface has a more desirable R-curve behaviour and a higher fracture toughness value than thenormal composite.