열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제21권5호
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  • Pages.251-258
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  • 2008
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  • 1225-1070(pISSN)
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  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
권호 표지

미세석출상을 포함하는 $L1_2$형 규칙 $Ni_3Al$의 변형조직에 관한 연구

A Study on the Deformation Induced Microstructure $L1_2$-ordered $Ni_3Al$ Containing Fine Precipitates

  • 한창석 (호서대학교 국방과학기술학과) ;
  • 이준 (호서대학교 로봇공학과)
  • Han, Chang-Suk (Dept. of Defense Science & Technology, Hoseo University) ;
  • Lee, Joon (Dept. of Robotic Engineering, Hoseo University)
  • 투고 : 2008.11.10
  • 심사 : 2008.11.25
  • 발행 : 2008.09.30
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초록

A transmission electron microscope investigation has been performed on the morphology of dislocations in deformed ${\gamma}^{\prime}-Ni_3(Al,Ti)$ alloys containing fine dispersion of disordered ${\gamma}$ particles. Superlattice dislocations dissociate into fourfold Shockley partial dislocations in a uniform supersaturated solid solution of the ${\gamma}^{\prime}$ phase. Dislocations are attracted into the disordered ${\gamma}$ phase and dissociate further in the particles. At any stage of aging, dislocations cut through the particles and the Orowan bypassing process does not occur even in the over-aged stage of this alloy system. The work necessary to pull the dislocation away from the disordered particles into the ordered matrix should mainly contribute to increase the strength of the ${\gamma}^{\prime}$ phase containing fine dispersion of the disordered ${\gamma}$ phase.

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