In situ laser heating and high temperature imaging in scanning electron microscopy
In-situ study of high-temperature microstructure and mechanical properties using scanning electron microscopy(SEM)is an important field of materials science.In-situ heating specimens in SEM directly determines the relationship among microstructure,mechanical property and temperature.However,it is difficult to obtain high-quality SEM images when the temperature of sample exceeds 800℃because metallic materials usually release a large number of hot electrons in the traditional way of current heating.In this study,a laser heating stage combined with SEM was introduced.The heating stage,employed a laser as the heating source,can rapidly heat a material and in-situ characterized the structure of the material at a high resolution.The design principle of the laser heating stage was introduced in detail.The temperature field of heating stage was analyzed using finite element simulation.In-situ experiments were also verified using nickel-based single crystal superalloys.The result showed that a high temperature of 1 370℃with a high imaging resolution was realized.
scanning electron microscopelaser heating tablehigh temperature imagingin-situ characterization
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维普
