Structrual evolution of the Ti70Ni15Al15 powders prepared by mechanical alloying

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Amorphization and crystallization behaviors of Ti70Ni15Al15 powders during mechanical alloying (MA) and subsequent heat treatments are studied. Amorphous phase that cannot be obtained in the rapidly quenched ribbon is formed in the powders after MA for 60 h. Upon continuous heating of the amorphous powders in DSC, two exothermic events are observed. The first exothermic event corresponds to the crystallization of the amorphous matrix into a supersaturated α-Ti phase of hexagonal close-packed structure. The growth kinetic of the α-Ti phase is sluggish, resulting in the formation of nanostructured α-Ti matrix. The second exothermic event corresponds to the solid state transformation of the meta-stable α-Ti into the equilibrium phases, Ti2Ni and Ti3Al. Using the amorphous powders, Ti-based bulk materials with novel microstructures can be developed for structural applications.

Original languageEnglish
Pages (from-to)148-152
Number of pages5
JournalMaterials Science and Engineering A
Volume300
Issue number1-2
DOIs
Publication statusPublished - 2001 Feb 28

Fingerprint

Mechanical alloying
Powders
alloying
Crystallization
crystallization
Amorphization
Growth kinetics
matrices
Phase equilibria
ribbons
heat treatment
Heat treatment
solid state
Heating
microstructure
Microstructure
heating
kinetics

All Science Journal Classification (ASJC) codes

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

Cite this

Kim, K. B. ; Yi, S. ; Kim, S. H. ; Kim, W. T. ; Kim, D. H. / Structrual evolution of the Ti70Ni15Al15 powders prepared by mechanical alloying. In: Materials Science and Engineering A. 2001 ; Vol. 300, No. 1-2. pp. 148-152.
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Structrual evolution of the Ti70Ni15Al15 powders prepared by mechanical alloying. / Kim, K. B.; Yi, S.; Kim, S. H.; Kim, W. T.; Kim, D. H.

In: Materials Science and Engineering A, Vol. 300, No. 1-2, 28.02.2001, p. 148-152.

Research output: Contribution to journalArticle

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