High-Temperature In-Situ Scanning Electron Microscopy Techniques

High-temperature in-situ scanning electron microscopy (HT-in-situ SEM) integrates specialised heating stages directly into the microscope chamber, enabling real-time visualisation of microstructural evolution under controlled thermal conditions. By combining precise temperature control with high-resolution electron imaging, this approach reveals dynamic processes—such as grain growth, phase transformations, precipitation and crack initiation—as they occur at temperatures ranging from several hundred to over a thousand degrees Celsius. Key challenges addressed by recent instrument developments include minimising thermal drift, ensuring vacuum compatibility of heating elements and maintaining detector sensitivity at elevated temperatures. The technique permits simultaneous use of secondary and backscattered electron detectors to correlate surface topography with compositional contrast, thereby linking microstructural changes to mechanical and thermal behaviour. Applications span metallurgical heat treatments, ceramic sintering, additive manufacturing and the study of functional materials, offering unprecedented insights that guide the design of heat-resistant alloys, optimise processing routes and improve high-temperature performance in critical engineering components.

Research from Nature Portfolio

No recent Nature Portfolio content available.

High-Temperature In-Situ Scanning Electron Microscopy Techniques publication trend

The graph below shows the total number of articles in high-temperature in-situ scanning electron microscopy techniques across all publications each year (not limited to Nature Index journals).

Technical terms

In-situ SEM: Scanning electron microscopy performed while the specimen is subjected to controlled environmental or thermal conditions.

Thermal etching: Technique in which high-temperature exposure produces grain boundary grooves, enhancing contrast for microstructural characterisation.

Secondary electrons: Low-energy electrons emitted from the specimen surface, providing high-resolution images of topography.

Backscattered electrons: High-energy electrons reflected from the specimen, offering contrast based on atomic number differences.

Austenitic phase: Face-centred cubic crystal structure of iron in steel, stable at elevated temperatures above the ferrite-to-austenite transformation point.

References

1. In-situ microscopy methods for imaging high-temperature microstructural processes – Exploring the differences and gaining new potentials. Materials Science and Engineering A (2023).
2. In‐situ SEM observation of grain growth in the austenitic region of carbon steel using thermal etching. Journal of Microscopy (2020).