Energy-filtered electron microscopy study on phase transformation of alloys

D. Shindo, Y. Murakami, Y. Ikematsu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Recent progress of electron microscopy on phase transformations of alloys, especially energy-filtered electron microscopy, was reviewed mainly on the basis of the recent works by the authors. In the energy-filtered electron diffraction patterns of both Cu72.5Pd27.5 and Ti50Ni48Fe2 alloys, weak diffuse scattering which resulted from the diffusional and displacive phase transformations, respectively, was clearly observed by virtue of the background subtraction. In a short-range ordered state of a Cu72.5Pd27.5 alloy, through the careful evaluation of the dynamical diffraction effect on the diffuse scattering, short-range order parameters were evaluated quantitatively. On the other hand, in the premartensitic state of a Ti50Ni48Fe2 alloy, the morphology and growth process of microdomains less than 5 nm with a single transverse type of atomic displacement were clarified by energy-filtered electron diffraction and in situ dark-field electron microscopy. Furthermore, through in situ electron energy-loss spectroscopy on L2.3 core edges of a Ti50Ni48Fe2 alloy, the change in the electronic structure due to the martensitic transformation was analyzed. Thus, it is clearly demonstrated that advanced electron microscopy utilizing electron energy-loss spectroscopy is effective to make clear the change in both crystal and electronic structures associated with phase transformations in alloys.

Original languageEnglish
Pages (from-to)9-19
Number of pages11
JournalMaterials Science and Engineering A
Volume312
Issue number1-2
DOIs
Publication statusPublished - Aug 15 2001
Externally publishedYes

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Electron microscopy
phase transformations
electron microscopy
Phase transitions
Electron energy loss spectroscopy
Electron diffraction
Electronic structure
energy
electron diffraction
energy dissipation
Scattering
electron energy
electronic structure
Martensitic transformations
martensitic transformation
scattering
subtraction
Diffraction patterns
spectroscopy
diffraction patterns

All Science Journal Classification (ASJC) codes

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

Cite this

Energy-filtered electron microscopy study on phase transformation of alloys. / Shindo, D.; Murakami, Y.; Ikematsu, Y.

In: Materials Science and Engineering A, Vol. 312, No. 1-2, 15.08.2001, p. 9-19.

Research output: Contribution to journalArticle

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