Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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The Formation and Crystallization of Amorphous Ti50Cu50Ni20Al10 Powder Prepared by High-Energy Ball Milling

  • Viet, Nguyen Hoang (Research Center for Machine Parts and Materials Processing, School of Materials Science and Engineering, University of Ulsan) ;
  • Kim, Jin-Chun (Research Center for Machine Parts and Materials Processing, School of Materials Science and Engineering, University of Ulsan) ;
  • Kim, Ji-Soon (Research Center for Machine Parts and Materials Processing, School of Materials Science and Engineering, University of Ulsan) ;
  • Kwon, Young-Soon (Research Center for Machine Parts and Materials Processing, School of Materials Science and Engineering, University of Ulsan)
  • Published : 2009.02.28
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Abstract

Amorphization and crystallization behaviors of $Ti_{50}Cu_{50}Ni_{20}Al_{10}$ powders during high-energy ball milling and subsequent heat treatment were studied. Full amorphization obtained after milling for 30 h was confirmed by X-ray diffraction and transmission electron microscope. The morphology of powders prepared using different milling times was observed by field-emission scanning electron microscope. The powders developed a fine, layered, homogeneous structure with prolonged milling. The crystallization behavior showed that the glass transition, $T_g$, onset crystallization, $T_x$, and super cooled liquid range ${\Delta}T=T_x-T_g$ were 691,771 and 80 K, respectively. The isothermal transformation kinetics was analyzed by the John-Mehn-Avrami equation. The Avrami exponent was close to 2.5, which corresponds to the transformation process with a diffusion-controlled type at nearly constant nucleation rate. The activation energy of crystallization for the alloy in the isothermal annealing process calculated using an Arrhenius plot was 345 kJ/mol.

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