Behavior of Intermetallic Compound Formation in Al-25Nb system and (Al,X)-25Nb (X= Cr, Cu, Fe, Mn) systems by Mechanical Alloying Method

A1-25Nb계와 (A1,X)-25Nb계 (X = Cr, Cu, Fe, Mn)의 기계적 합금화에 의한 금속간 화합물의 형성 거동에 관한 연구

  • Choi, Jae-Woong (Division of Materials Science and Engineering, Hanyang Univ) ;
  • Kang, Sung-Goon (Division of Materials Science and Engineering, Hanyang Univ)
  • 최재웅 (한양대학교 공과대학 재료공학부) ;
  • 강성군 (한양대학교 공과대학 재료공학부)
  • Published : 2001.09.01


In Al-25Nb binary system, it was observed only formation of $D0_{22}$ $Al_3Nb$ intermetallic compound after 5hr milling but it was not observed formation of meta stable phase like L1$_2$ phase. In this state, $D0_{22}$ $Al_3Nb$ fabricated had nano sized grain of approximately 20nm. Ternary systems, transition metals such as Cr, Cu, Fe, Mn were added 6~12at.% as substitution of Al, showed formation of $D0_{22}$ $Al_3Nb$ like Al-25Nb binary system. In Al- l2Cu-25Nb system, it was observed that broad XRD pattern like amorphization of Al and not observed formation of $D0_{22}$ $Al_3Nb$ after 5hr milling. But there was mixed phase of a lot of amorphous Al and little $D0_{22}$ $Al_3Nb$ through TEM. In the states of unalloyed, 5~7hr milling time, those showed exothermic reaction at 35$0^{\circ}C$, which was formation of $D0_{22}$ $Al_3Nb$ like Al-25Nb binary system. With increasing milling time to 10hr, $D0_{22}$ $Al_3Nb$ was transformed to mixed phase of amorphous and nanocryatlline, having approximately 10nm grain but the meta stable $Al_3Nb$ was not fabricated by adding transition metals.


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