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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)

材料科学技术（英文）

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.

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Effect of Wetting and NiAl_2O_4 Spinel Formation on the Bonding between Al_2O_3 and Ni

Xudong SUN and J.A. Yeomans (Dept. of Materials Science and Engineering , University of Surrey Guildford , Surrey GU2 5XH , UK (To whom correspondence should be addressed Present address: Dept. of Materials Science and Engineering , Northeastern University

材料科学技术（英文）

Al2O3-Ni interface formed under vacuum condition is non-wetting and weak. Severe instantaneous intedecial reaction (i.e. wetting) at the Al2O3-Ni interface promoted by oxygen can create a strengthened interface. The NiAl2O4 spinel-Ni intedece is weak and growth of the spinel interphase is detrimental to the Al2O3-Ni intedecial bonding. A proper control of the oxygen partial pressure can achieve wetting while avoiding the existence of spinel at the interface, producing stronger interfaces by both mechanical interlocking and more intimate chemical bonding in an Al2O3-20 vol pct Ni composite.

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