Processing and mechanical properties of laminar Al(sub 2)O(sub 3)-Ni(sub 3)Al composites

摘要

Several compositions of the intermetallic alloy Ni(sub 3)Al were examined with respect to (a) their wetting of Al(sub 2)O(sub 3) and (b) their energy absorption capability in Al(sub 2)O(sub 3)/Ni(sub 3)Al laminates. Wetting is enhanced by small additions of carbon (e.g., 0.1 at. %), and bonding by additions of zirconium (e.g., 1 at. %). Chevron-notched laminate specimens were tested in three-point bending to assess the energy absorption due to the presence of a thin layer of Ni(sub 3)Al. A nickel aluminide with the composition of Ni-22Al-1Zr-0.1C-0.1B was found to have a reasonable combination of wetting, adhesion and energy absorption. Interfacial bonding was found to be weak in all laminates.