Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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A Study on the Precipitation Behavior of Carbide Particle in L12-type Intermetallic Compound Ni3Al

L12형 금속간화합물 Ni3Al중에 탄화물입자의 석출거동에 관한 연구

  • Han, Chang-Suk (Dept. of Defense Science & Technology, Hoseo University) ;
  • Koo, Kyung-Wan (Dept. of Defense Science & Technology, Hoseo University) ;
  • Oh, Dong-Cheol (Dept. of Defense Science & Technology, Hoseo University)
  • 한창석 (호서대학교 국방과학기술학과) ;
  • 구경완 (호서대학교 국방과학기술학과) ;
  • 오동철 (호서대학교 국방과학기술학과)
  • Published : 2006.04.27
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Abstract

Structural studies have been performed on precipitation hardening discovered in $L1_2-ordered\;Ni_3(Al,Cr)$ containing 0.2 to 3.0 mol% of carbon using transmission electron microscopy (TEM). Fine octahedral precipitates of $M_{23}C_6$ appeared in the matrix by aging at temperatures around 973 K after solution treatment at 1423 K. TEM examination revealed that the $M_{23}C_6$ phase and the matrix lattices have a cube-cube orientation relationship and keep partial atomic matching at the {111} interface. After prolonged aging or by aging at higher temperatures, the $M_{23}C_6$ precipitates then adopt a rod-like morphology elongated parallel to the <100> directions. Deformation at temperature below 973 K, typical Orowan loops were observed surrounding the $M_{23}C_6$ particles. At higher deformation temperatures, the Orowan loops disappeared and the morphology of dislocations at the particle-matrix interfaces suggested the existence of attractive interaction between dislocations and particles. The change of the interaction modes between dislocation and particles with increasing deformation temperature can be considered as a result of strain relaxation at the interface between matrix and particles.

Keywords

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  1. Al-Based Intermetallic Alloy vol.22, pp.1, 2012, https://doi.org/10.3740/MRSK.2012.22.1.042
  2. Influence of Mo Addition on High Temperature Deformation Behavior of L12 Type Ni3Al Intermetallics vol.26, pp.4, 2016, https://doi.org/10.3740/MRSK.2016.26.4.167