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Related Experiment Videos

High-Temperature In Situ Straining Experiments in the High-Voltage Electron Microscope

Messerschmidt1, Baither, Bartsch

  • 1Max Planck Institute of Microstructure Physics, Weinberg 2, Halle/Saale D-06120, Germany

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|December 16, 1998
PubMed
Summary

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High-temperature transmission electron microscopy stages enable observing material deformation above 1000°C. This reveals insights into ferroelasticity, dislocation plasticity, and viscous dislocation motion in advanced materials.

Area of Science:

  • Materials Science
  • Physical Metallurgy
  • Electron Microscopy

Background:

  • High-temperature deformation mechanisms are crucial for material performance.
  • In situ transmission electron microscopy (TEM) requires specialized stages for extreme conditions.

Purpose of the Study:

  • To present design principles for high-temperature straining stages for TEM.
  • To investigate high-temperature deformation behaviors of various materials using these stages.

Main Methods:

  • Development of TEM straining stages capable of reaching over 1000°C via electron bombardment.
  • Implementation of water cooling for rapid thermal equilibrium.
  • In situ observation of deformation in zirconia, INCOLOY MA 956, MoSi2, and Al-Pd-Mn quasicrystals.

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Main Results:

  • Ferroelastic deformation and microstructural changes were observed in zirconia at 1150°C.
  • Dislocation movement in INCOLOY MA 956 is influenced by oxide particles and temperature-dependent time factors.
  • Viscous dislocation motion was characterized in MoSi2 single crystals and Al-Pd-Mn quasicrystals.

Conclusions:

  • The developed TEM straining stage facilitates high-temperature deformation studies.
  • In situ observations provide critical data for understanding macroscopic deformation at elevated temperatures.
  • Material-specific deformation mechanisms, including ferroelasticity and viscous glide, are elucidated.