Characterization of Ni57Zr20Ti18Al 5 amorphous powder obtained by mechanical alloying

Pee Yew Lee, Chung Kwei Lin, I. Kuan Jeng, Chien Chung Wang, Giin Shan Chen

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This study examined the amorphization behavior and thermal stability of mechanically alloyed Ni57Zr20Ti18Al 5 alloy powders synthesized by high-energy ball milling. Complete amorphization is feasible after 5h of milling. The thermal stability of the Ni57Zr20Ti18Al5 amorphous powders was investigated by differential thermal analysis. As the results demonstrated, the temperature interval of the supercooled liquid region defined by the difference between glass transition temperature (Tg) and crystallization temperature (Tx), i.e., ΔT (=T x-Tg) is 54K for Ni57Zr20Ti 18Al5. The glass transition and crystallization temperatures of mechanically alloyed samples are different from those reported in the literature for samples prepared by melt spinning techniques. The different thermal stability is believed to be due to the introduction of impurities into the ball-milled samples during mechanical alloying process. The glass transition behavior in the Ni57Zr20Ti 18Al5 is found to be a kinetically modified thermodynamic phase transformation process.

Original languageEnglish
Pages (from-to)358-362
Number of pages5
JournalMaterials Chemistry and Physics
Volume84
Issue number2-3
DOIs
Publication statusPublished - Apr 2004
Externally publishedYes

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Keywords

  • Amorphous phase
  • Glass transition
  • Mechanical alloying
  • Ni-based alloys
  • Supercooled liquid region

ASJC Scopus subject areas

  • Materials Chemistry

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