Skip to main content
eScholarship
Open Access Publications from the University of California

Crystallization behavior of a gas atomized Al85Ni10La5 amorphous alloy

  • Author(s): Zhang, Zhihui
  • Witkin, D
  • Lavernia, E J
  • et al.
Abstract

Al85Ni10La5 (at.%) alloy powders were fabricated using gas atomization. X-ray diffraction analysis revealed that powders in the size range of < 500 mesh (< 25 mu m) are amorphous. The crystallization behavior and kinetics of the amorphous Al85Ni10La5 powders (< 25 mu m) were investigated during continuous heating and isothermal annealing. The amorphous Al85Ni10La5 alloy undergoes a multi-step crystallization reaction in the temperature range of 250-390 degrees C. The activation energies for the first exothermic reactions were determined as 344 kJ/mol. Instead of a primary crystallization, a eutectic reaction was found to be associated with the first reactions and the crystalline phases were identified as fcc-Al, Al11La3, Al3Ni and a metastable phase Al3La. The isothermal annealing was carried out at temperatures of 235 degrees C, 245 degrees C and 250 degrees C. Results from the isothermal annealing analyses revealed presence of quenched-in Al nuclei. The influence of isothermal annealing on the thermal stability of the Al85Ni10La5 powders (< 25 mu m) is also discussed. (c) 2005 Elsevier B.V. All rights reserved.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View