Ti-based bulk amorphous and quasicrystalline materials prepared by warm process

K. B. Kim, S. Yi, H. K. Lim, S. H. Kim, W. T. Kim, D. H. Kim

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

Amorphization and crystallization behaviors of Ti70Ni15Al15 and Ti41.5Zr41.5Ni17 powders during mechanical alloying (MA) and subsequent heat treatments are studied. Fully amorphous powders are prepared by MA of the elemental powder mixture of the nominal composition of Ti70Ni15Al15. During.continuous heating of the amorphous powders in DSC, two exothermic events are observed. The first exothermic event corresponds to the formation of a supersaturated α-Ti phase of hexagonal close-packed structure. The growth kinetic of the α-Ti phase is sluggish forming nanostructured α-Ti matrix. The second exothermic event is associated with the solid-state transformation of the meta-stable α-Ti into the equilibrium phases, Ti2Ni and Ti3Al. Amorphous powders are prepared after MA for more than 30 hours in the mixture of elemental powders with the nominal composition of Ti41.5Zr41.5Ni17. The amorphous powder transforms into the quasicrystalline phase in the temperature range of 300-400 °C during continuous heating in DSC. Based on the observed amorphization and crystallization behavior Ti70Ni15Al15 and Ti41.5Zr41.5Ni17 powders, bulk materials consisting of amorphous phase with small fraction of nanocrystals in the Ti-Ni-Al system and quasicrystalline phase in the Ti-Zr-Ni system can be fabricated in a hot press using MA powders.

Original languageEnglish
Pages (from-to)21-28
Number of pages8
JournalMaterials Science Forum
Volume360-362
DOIs
Publication statusPublished - 2001 Jan 1
EventMetastable, Mechanically Alloyed and Nanocrystalline Materials (ISMANAM 2000) - Oxford, United Kingdom
Duration: 2000 Jul 92000 Jul 14

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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