Development of scanning three-dimensional x-ray diffraction microscopy and in-situ observation of plastic deformation of polycrystalline metals

三维X射线衍射显微镜是一种无损地观察多晶金属材料中每一晶粒的晶体取向和应力的新方法。在典型的测量技术中，由于观察到的横截面中的颗粒数量的限制，通常很难观测到理想的多晶变形。在本研究中，我们提出了一种扫描3DXRD的方法，使我们可以在横截面上观察到尽可能多的颗粒。实验证明了扫描三维X射线衍射仪识别试件中任意点处的颗粒的原理。在拉伸载荷作用下，通过原位三维取向图观察了多晶铁氧体的体心立方滑移变形。

The three-dimensional x-ray diffraction (3DXRD) microscopy is a novel method for non-destructively three-dimensional observation of crystal orientation and stress of each crystal grain in polycrystalline metallic materials. It may be often difficulty to observe ideal polycrystalline deformation in a typical measurement technique due to the limit of number of grains in an observed cross section. In this study, the approach named scanning 3DXRD which allows us to observe specimens with as a large number of grains as possible in the cross section is proposed. The principle of the scanning 3DXRD that identifies the grain at an arbitrary point in a specimen was experimentally proved. The BCC slip deformation of a polycrystalline ferrite was observed from in-situ three-dimensional mapping of orientation under a tensile load.