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- Title
In situ reactive hot press sintering and mechanical properties of AlO-TiB-BC composites.
- Authors
Huang, Haipeng
- Abstract
Dense AlO-TiB-BC composites are synthesized by in situ reactive hot press sintering of BC with 20 wt% TiAl and TiAl at 1700 °C, respectively. The sinterability of BC is improved by the intermetallic compounds due to the formation of AlO and TiB. The sizes of AlO, TiB, and BC grains are less than 2.5 μm. The agglomerates of AlO and TiB particles tend to orientationally align in the direction perpendicular to the pressure axis. By incorporation of TiAl, the flexural strength and fracture toughness reach 482 MPa and 3.6 MPa m, respectively. When TiAl is added, the flexural strength is reduced to 408 MPa because of the thermal residual stress, while the fracture toughness is increased to 4.2 MPa·m. The increase of AlO in the composite can reduce the strength and enhance the toughness of the composite due to the thermal residual stress originated from the thermal expansion mismatch between BC and AlO.
- Subjects
HOT pressing; SINTERING; MECHANICAL behavior of materials; ALUMINUM oxide; TITANIUM composites; CHEMICAL reactions
- Publication
Journal of Materials Science, 2016, Vol 51, Issue 7, p3481
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-015-9666-9