Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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The Effect of Grain Size and Cooling Rate on Phase Transformation for Mechanically Alloyed Ni-36at.%Al Alloy

기계적 합금화된 Ni-36at.%Al 합금의 상변태에 미치는 결정립 크기 및 냉각속도의 영향

  • Kim, Seong-Uk (Division of Materials Science and Metallurgical Engineering, Hanyang University) ;
  • Kim, Dae-Geon (Division of Materials Science and Metallurgical Engineering, Hanyang University) ;
  • Kim, Ji-Sun (School of Materials & Metallurgy Engineering, University of ulsan) ;
  • An, In-Seop (Dept. of Materials & Materials Engineering, Gyeongsang University) ;
  • Kim, Yeong-Do (Division of Materials Science and Metallurgical Engineering, Hanyang University)
  • Published : 2000.09.01
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Abstract

Nanocrystalline NiAl alloy containing 36at.%Al was synthesized by mechanical alloying (MA). Synthesized powder was sintered by a pulse electric current sintering (PECS) facility. Effecting parameters on the phase transformation were discussed in terms of cooling rate and time spent on heat treatment. The behavior of phase transformation for sintered parts was examined by differential scanning calorimetry (DSC) and X-ray diffraction (XRD) method. Microstructure was observed by scanning electron microscopy (SEM). Martensitic lattice parameter and volume fraction was calculated by direct comparison method in X-ray diffraction analysis.

Ni-36at.%Al을 함유하는 나도 결정립의 NiAl 합금이 기계적 합금화법에 의해 제조되었다. 제조된 분말은 방전 플라즈마 소결법에 의해 만들어졌다. 상변테에 영향을 주는 인자는 냉각속도와 열처리 시간의 조건으로 논의되었다. 소결체의 상변태 거동은 시차 열분석(DSC)과 X-선 회절(XRD) 분석법에 의해 조사되었다. 미세구조는 주사전자현미경(SEM)으로 관찰되었다. 마르텐사이트 격사상수와 체적 분율은 X-선 회절분석법 중 직접비교법에 의해 계산되었다.

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