TEM study of B2 + L12 decomposition in a nanoscale Ni-rich Ni-Al film

D. Schryvers, M. Yandouzi, L. Toth

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The decomposition of a free-standing monophase B2 Ni62.5Al37.5 thin film with nanoscale dimensions, for thickness as well as lateral grain size, is investigated by in situ and subsequent high resolution transmission electron microscopy. The atomic structure, micro structure and texture are unchanged until a temperature of 450°C is reached above which a two-phase mixture of B2 + L12 is formed. The predominant texture of the B2 film is inherited in the L12 grains and even improved during the passage of the transformation front. As a result many small angle tilt boundaries exist in between neighbouring [001] L12 grains. Around 1000°C some of the L12 grains grow in thickness forming microcrystals and using material from nearby grains thus deteriorating the integrity of the film. Occasionally also fcc Ni microcrystals with up to 15 at.% disordered Al are observed.

Original languageEnglish
Pages (from-to)126-133
Number of pages8
JournalThin Solid Films
Volume326
Issue number1-2
DOIs
Publication statusPublished - Aug 4 1998

Keywords

  • Alloys
  • Evaporation
  • Phase transition
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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