Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Sintering Temperature on Microstructure and Mechanical Properties of Cu Particles Dispersed Al2O3 Nanocomposites

Cu 입자분산 Al2O3 나노복합재료의 미세조직과 기계적 특성에 미치는 소결온도의 영향

  • Jeong, Young-Keun (National Core Research Center for Hybrid Materials Solution, Pusan National University) ;
  • Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Technology) ;
  • Choa, Yong-Ho (Division of Materials and Chemical Engineering, Hanyang University)
  • 정영근 (부산대학교 하이브리드소재 솔루션 NCRC) ;
  • 오승탁 (서울산업대학교 신소재공학과) ;
  • 좌용호 (한양대학교 재료화학공학부)
  • Published : 2006.10.28
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Abstract

The microstructure and mechanical properties of hot-pressed $Al_2O_3/Cu$ composites with a different sintering temperature have been studied. The size of matrix grain and Cu dispersion in composites increased with increase in sintering temperature. Fracture toughness of the composite sintered at high temperature exhibited an enhanced value. The toughness increase was explained by the thermal residual stress, crack bridging and crack branching by the formation of microcrack. The nanocomposite, hot-pressed at $1450^{\circ}C$, showed the maximum fracture strength of 707 MPa. The strengthening was mainly attributed to the refinement of matrix grains and the increased toughness.

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References

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