Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Measurement of Hardness of Constituent Phases in Ti(C0.7N0.3)-NbC-Ni Cermets Using Nanoindentation

나노인덴테이션을 이용한 Ti(C0.7N0.3)-NbC-Ni 써멧 구성상의 경도평가

  • Kim, Seong-Won (Advanced Engineering Ceramics Department, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Dae-Min (Advanced Engineering Ceramics Department, Korea Institute of Ceramic Engineering and Technology) ;
  • Kang, Shin-Hoo (Department of Materials Science and Engineering, Seoul National University) ;
  • Ryu, Sung-Soo (Advanced Engineering Ceramics Department, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Hyung-Tae (Advanced Engineering Ceramics Department, Korea Institute of Ceramic Engineering and Technology)
  • Published : 2008.12.28
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Abstract

The indentation technique has been one of the most commonly used techniques for the measurement of the mechanical properties of materials due to its experimental ease and speed. Recently, the scope of indentation has been enlarged down to the nanometer range through the development of instrumentations capable of continuously measuring load and displacement. In addition to testing hardness, the elastic modulus of submicron area could be measured from an indentation load-displacement (P-h) curve. In this study, the hardness values of the constituent phases in Ti($C_{0.7}N_{0.3}$)-NbC-Ni cermets were evaluated by nanoindentation. SEM observation of the indented surface was indispensable in order to separate the hardness of each constituent phase since the Ti($C_{0.7}N_{0.3}$)-based cermets have relatively inhomogeneous microstructure. The measured values of hardness using nanoindentation were ${\sim}20$ GPa for hard phase and ${\sim}10$ GPa for binder phase. The effect of NbC addition on hardness was not obvious in this work.

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