Toughening and Strengthening of NiAl with Al2O3 by the Addition of ZrO2(3Y) |
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| Authors: | Atsushi Kitaoka Ken Hirota Masaru Yoshinaka Yoshinari Miyamoto Osamu Yamaguchi |
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| Affiliation: | Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University, Kyo-Tanabe, Kyoto 610-0321, Japan;and Joining and Welding Research Institute, Osaka University, 567-0047, Japan |
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| Abstract: | NiAl/10-mol%-ZrO2(3Y) composites of almost full density have been fabricated via spark plasma sintering (SPS) for 10 min at 1300°C and 30 MPa. The former intermetallic compound, which contains a trace amount of Al2O3, has been prepared via self-propagating high-temperature synthesis. The composite microstructures are such that tetragonal ZrO2 (∼0.2 μm) and Al2O3 (∼0.5 μm) particles are located at the grain boundaries of the NiAl (∼46 μm) matrix. Improved mechanical properties are obtained: the fracture toughness and bending strength are 8.8 MPa·m1/2 and 1045 MPa, respectively, and high strength (>800 MPa) can be retained up to 800°C. |
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| Keywords: | composites fracture mechanics/toughness strength |
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