급속냉각한 Al-(1, 3, 5)Cr 합금의 조직에 미치는 기계적 합금화의 영향

Effects of Mechanical Alloying on the Structure of Rapid Solidified Al-(1, 3, 5 )Cr Alloys

  • 지태구 (홍익대학교 과학기술대학 금속공학과) ;
  • 김완철 (홍익대학교 과학기술대학 금속공학과)
  • Jhee, T.G. (Dept. of Metallurgical Engineering, Hong-Ik University) ;
  • Kim, W.C. (Dept. of Metallurgical Engineering, Hong-Ik University)
  • 발행 : 1993.12.31

초록

Rapid solidified splats Al-(1, 3, 5Cr) Alloys were produced by atomization-splat quenching method. Effects of mechanical alloying on the structure and mechanical properties of rapidly solidified Al-(1, 3, 5)Cr alloys were studied. Degree of mechanical alloying of Al-(1, 3, 5)Cr alloys can be determined by observing the microstructural refinement, microhardness and microstructure of Al-(l, 3, 5)Cr splats during processing. In the initial stage of mechanical alloying of the Al-(1, 3, 5)Cr splats fracturing of the grain boundaries occured first, followed after fracturing of zone A regions. Saturation hardness of Al-(1, 3, 5)Cr alloys increased proportionally with increasing concentration of the solute (Cr). Age hardening was not observed in these alloys. Decomposition temperature of Al-1Cr splats after mechanical alloying was higher than that of Al-5Cr splats. The density of $Al_7$ Cr precipitates increased proportionally with increasing chromium content, as a result, there was a transition to finely and spherically dispersed phase after mechanical alloying.

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