Huang Y, Humphreys F J, Brough I
Manchester Materials Science Centre, Grosvenor Street, Manchester M1 7HS, UK.
J Microsc. 2002 Oct;208(Pt 1):18-23. doi: 10.1046/j.1365-2818.2002.01061.x.
The technique of combining in situ hot-deformation and high resolution electron backscattered diffraction (EBSD) has been applied to study the mechanisms operating during the thermomechanical processing of metals. A simple hot tensile-straining stage is installed in a field emission gun scanning electron microscope equipped with an EBSD system and has been used successfully for a number of preliminary investigations. These investigations include substructure formation, dynamic subgrain and grain growth, superplastic deformation in aluminium alloys, and dynamic recrystallization in copper. Despite the surface topography, which inevitably increases during plastic deformation, channelling contrast backscattered electron micrographs have been successfully obtained after strains of up to approximately 50%. Good quality EBSD maps have been obtained after strains of up to 100%. Most observations and measurements from the in situ experiments are consistent with what is known about the mechanisms occurring in the bulk. The microstructures revealed in the centre of the in situ samples after later repolishing are generally similar to those at the surface.
将原位热变形与高分辨率电子背散射衍射（EBSD）相结合的技术已被应用于研究金属热机械加工过程中的作用机制。在配备EBSD系统的场发射枪扫描电子显微镜中安装了一个简单的热拉伸应变阶段，并已成功用于多项初步研究。这些研究包括亚结构形成、动态亚晶粒和晶粒生长、铝合金中的超塑性变形以及铜中的动态再结晶。尽管在塑性变形过程中表面形貌不可避免地会增加，但在高达约50%的应变后，仍成功获得了通道对比度背散射电子显微照片。在高达100%的应变后，已获得高质量的EBSD图。原位实验的大多数观察和测量结果与已知的体相机制一致。原位样品中心在后续重新抛光后显示的微观结构通常与表面的微观结构相似。
