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Fracture and deformation behaviour of melt growth composites at very high temperatures

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Abstract

Unidirectionally solidified Al2O3/Y3Al5O12 (YAG) or Al2O3/Er3Al5O12 (EAG) eutectic composites, which are named as Melt Growth Composites (MGCs) has recently been fabricated by unidirectional solidification. The MGCs have a new microstructure, in which continuous networks of single-crystal Al2O3 phases and single-crystal oxide compounds (YAG or EAG) interpenetrate without grain boundaries. The MGCs fabricated are thermally stable and has the following properties: 1) the flexural strength at room temperature can be maintained up to 2073 K (just below its melting point), 2) a fracture manner from room temperature to 2073 K is an intergranular fracture different from a transgranular fracture of sintered composite with the same composition, 3) the compressive creep strength at 1873 K and a strain rate of 10−4/sec is 7–13 times higher than that of sintered composites, 4) the mechanism of creep deformation is based on the dislocation creep models completely different from the Nabarro-Herring or Coble creep models of the sintered composites, and 5) it shows neither weight gain nor grain growth, even upon heating at 1973 K in an air atmosphere for 1000 hours. The above superior high-temperature characteristics are caused by such factor as the MGCs having a single-crystal Al2O3/single-cryatal oxide compounds without grain boundaries and colonies, and the formation of the thermodynamically stable and compatible interface without amorphous phase.

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Authors and Affiliations

  1. Japan Ultra-high Temperature Materials Research Institute, Ube City, Yamaguchi, 755-0001, Japan

    Y. Waku, A. Mitani & K. Shimizu

  2. Ube Research Laboratory, Corporate and Development, UBE Industries, Ltd., Ube City, Yamaguchi, 755-8633, Japan

    N. Nakagawa & H. Ohtsubo

Authors
  1. Y. Waku
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  2. N. Nakagawa
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  3. H. Ohtsubo
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  4. A. Mitani
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  5. K. Shimizu
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Correspondence to Y. Waku.

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Waku, Y., Nakagawa, N., Ohtsubo, H. et al. Fracture and deformation behaviour of melt growth composites at very high temperatures. Journal of Materials Science 36, 1585–1594 (2001). https://doi.org/10.1023/A:1017519113164

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