Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Microstructures and Fracture Characteristic of Pressureless-Sintered DyNbO4 body

상압소경에 의해 제조된 DyNbO4 소결체의 미세조직과 파괴특성

  • 김기만 (공주대학교 공과대학 신소재공학부) ;
  • 안종관 (공주대학교 공과대학 신소재공학부) ;
  • 이병택 (공주대학교 공과대학 신소재공학부)
  • Published : 2002.06.01
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Abstract

The microstructures and indentation fracture of pressureless-sintered $DyNbO_4$ crystalline were investigated as a basic study for the application of weak phase of fibrous monolithic composites. They were comprised with many lamella twins as well as micro-cracks at the grain boundaries. The hardness at room temperature was remarkably low value(575 Hv) due to the low relative density and existence of microcracks at grain boundaries. The main fracture mode was a typical intergranular fracture, and showed remarkable micro-cracking effect. The heavy plastic deformation was observed around the site of indentation. In addition, the $DyNbO_4$ was expected to apply as a weak phase in the fibrous monolithic composites because of the low hardness and easily plastic deformation that could be led the preferable pulled-out and microcracking toughening under the failure.

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References

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