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Laser powered heating stage in a scanning electron microscope for microstructural investigations at elevated temperatures
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10.1063/1.2908434
/content/aip/journal/rsi/79/4/10.1063/1.2908434
http://aip.metastore.ingenta.com/content/aip/journal/rsi/79/4/10.1063/1.2908434
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Sketch of the heating stage: (a) isometric front view depicting the basic outer parts; (b) cross section of the stage interior: (1) rear outer copper heating shield (actively water cooled); (2) internal tantalum heating shield (not cooled); (3) SiC sample holder—absorber platelet; (4) specimen mount—tungsten clamp; (5) heating stage copper base (actively water cooled); (6) optical fiber guidance; (7) goniometer stage adapter. Overall dimensions are approximately .

Image of FIG. 2.
FIG. 2.

Basic principle of the laser heating stage: SiC sample holder is heated up by absorbing the infrared laser light of wavelength .

Image of FIG. 3.
FIG. 3.

Sketch of the SiC sample holder placed on a steel scaffolding. The diameter of the steel stilts is minimized with respect to mechanical stability in order to reduce thermal dissipation.

Image of FIG. 4.
FIG. 4.

Sketch of the setup for hot stage in situ EBSD measurements and OC imaging. The heating unit controls the temperature of the SiC sample holder and adjusts the power output of the infrared laser to keep the desired constant temperature; the EBSD system performs automated EBSD-data acquisition or video camera (charge coupled device) records OC images.

Image of FIG. 5.
FIG. 5.

OC images of a moving 20°⟨100⟩ tilt grain boundary and its displacement vs time at (bottom).

Image of FIG. 6.
FIG. 6.

OC images of the moving boundary system with triple junction composed of three ⟨100⟩ tilt boundaries and displacement of the entire system vs time at (bottom).

Image of FIG. 7.
FIG. 7.

Facet configuration of a 12.5°⟨111⟩ tilt grain boundary at .

Image of FIG. 8.
FIG. 8.

EBSD maps indicating the microstructure evolution of a low carbon steel during the phase transformation in the temperature range from . The light grains correspond to the low temperature bcc phase whereas the fcc-phase grains are dark.

Image of FIG. 9.
FIG. 9.

EBSD maps showing the microstructure evolution of a low carbon steel during the phase transformation during cooling from . The light grains correspond to the low temperature bcc phase whereas the fcc-phase grains are dark.

Image of FIG. 10.
FIG. 10.

Progressing of discontinuous recrystallization of pure Cu during annealing at after one ECAP pass.

Image of FIG. 11.
FIG. 11.

Change of recrystallized volume fraction of pure Cu with time as obtained from the in situ study shown in Fig. 10.

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/content/aip/journal/rsi/79/4/10.1063/1.2908434
2008-04-15
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Laser powered heating stage in a scanning electron microscope for microstructural investigations at elevated temperatures
http://aip.metastore.ingenta.com/content/aip/journal/rsi/79/4/10.1063/1.2908434
10.1063/1.2908434
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