Yang Wenge, Larson B C, Tischler J Z, Ice G E, Budai J D, Liu W
Condensed Matter Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA.
Micron. 2004;35(6):431-9. doi: 10.1016/j.micron.2004.02.004.
A recently developed differential-aperture X-ray microscopy (DAXM) technique provides local structure and crystallographic orientation with submicron spatial resolution in three-dimensions; it further provides angular precision of approximately 0.01 degrees and local elastic strain with an accuracy of approximately 1.0 x 10(-4) using microbeams from high brilliance third generation synchrotron X-ray sources. DAXM is a powerful tool for inter- and intra-granular studies of lattice distortions and lattice rotations on mesoscopic length scales of tenths of microns to hundreds of microns that are largely above the range of traditional electron microscopy probes. Nondestructive, point-to-point, spatially resolved measurements of local lattice orientations in bulk materials provide direct information on geometrically necessary dislocation density distributions through measurements of the lattice curvature in plastically deformed materials. This paper reviews the DAXM measurement technique and discusses recent demonstrations of DAXM capabilities for measurements of microtexture, local elastic strain, and plastic deformation microstructure.
最近开发的差分孔径X射线显微镜(DAXM)技术可在三维空间中提供具有亚微米空间分辨率的局部结构和晶体取向;它还利用来自高亮度第三代同步加速器X射线源的微束,提供约0.01度的角精度和约1.0×10⁻⁴精度的局部弹性应变。DAXM是一种强大的工具,可用于在十分之一微米到数百微米的介观长度尺度上对晶格畸变和晶格旋转进行颗粒间和颗粒内研究,这在很大程度上超出了传统电子显微镜探针的范围。通过对块状材料中局部晶格取向进行无损、点对点、空间分辨测量,通过测量塑性变形材料中的晶格曲率,可直接获得关于几何必要位错密度分布的信息。本文回顾了DAXM测量技术,并讨论了DAXM在测量微观织构、局部弹性应变和塑性变形微观结构方面能力的最新证明。