Electron microscopy nanoscale characterization of ball-milled Cu-Ag powders. Part I: Solid solution synthesized by cryo-milling

S. Zghal, M. J. Hÿtch, J. P. Chevalier, R. Twesten, F. Wu, P. Bellon

Research output: Contribution to journalArticle

Abstract

We present a study of nanostructured Cu-Ag material obtained by low temperature ball milling. The microstructural characterization is carried out using a wide variety of transmission electron microscopy (TEM) techniques from conventional dark-field imaging, selected area diffraction and energy dispersive X-ray spectrometry (EDS) to more modern techniques of scanning TEM high-angle dark-field imaging (HAADF), nanodiffraction and high resolution imaging (HREM). A novel method of HREM image analysis is also presented which consists of calculating geometric phase images by Fourier filtering. Real-space maps of lattice spacings and lattice rotations are thus obtained. The analysis addresses the following essential points of nanostructural characterization: dislocation densities, grain sizes and morphologies, grain boundaries and local lattice rotations, local textures, local variations in lattice parameters. A new description of the microstructure emerges from the observations, quite different to that expected. Analytical modeling suggests that large lattice rotations can be expected in nanomaterials produced by intense deformation.

Original languageEnglish (US)
Pages (from-to)4695-4709
Number of pages15
JournalActa Materialia
Volume50
Issue number19
DOIs
StatePublished - Nov 14 2002

Keywords

  • Alloys (copper, silver)
  • Ball milling
  • Cold-working
  • Nanomaterials
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Metals and Alloys

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