CMOS EBSD IR Screen

The Oxford Instruments IR screen provides a unique solution for our CMOS detectors, whereby EBSD analysis can easily be done during in-situ heating experiments without loss of performance.

The IR screen solution enables:

EBSD analysis in combination with heating stages
Same EBSD detector performance during heating experiments as for room temperature analysis.
No compromise in room temperature performance due to IR filtering

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Challenges for EBSD at high temperature

A sample heated to high temperatures >500 °C in the SEM chamber will emit high intensity IR radiation causing considerable amount of signal to be seem by the EBSD detector. This results in a lower quality diffraction pattern to be captured as the sensor will saturate due to the IR signal. Preventing the IR signal from reaching the sensor has traditionally been done by adding a coating onto the phosphor screen, however this results in reduced sensitivity of the detector.

Chamber scope image showing IR radiation during heating experiment.

Our Solution

Typical EBSP from beta-Ti (>1000 pps, acquired at 895°C)

A superior approach to is to use an optical interference filter: this effectively blocks out the IR signal without significant compromise to the detector’s sensitivity and is unaffected by imperfections in the phosphor screen. With such a screen, good quality EBSPs can be collected at high speed at temperatures approaching 1000 °C.

For more information about in-situ EBSD visit www.ebsd.com.

Applications

Our high temperature EBSD solution can also be used in combination with our EDS IR filter, enabling a full characterisation of the microstructure and chemistry of the material. The IR filter unlocks EDS high temperature analysis which is crucial to understanding phenomena like precipitation, phase transformation, diffusion, and segregation in a large range of materials like metals, alloys, ceramics, composites, and polymers. It can also be used in combination with EBSD enabling a full characterisation of the microstructure and chemistry of the material.

This example shows a combined high temperature EDS and EBSD experiment in a Fe-Ti alloy. The sample was heated to 900°C and then cooled to 500°C. The video shows a direct observation of Fe diffusing in the matrix and then Ti phase transformation from the alpha to beta phase.

Sample courtesy of Manchester University