Fancher C M, Hoffmann C M, Frontzek M D, Bunn J R, Payzant E A
Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA.
Rev Sci Instrum. 2019 Jan;90(1):013902. doi: 10.1063/1.5034135.
The crystallographic texture of polycrystalline materials is the result of how these materials are processed and what external forces materials have experienced. Neutron and X-ray diffraction are standard methods to characterize global crystallographic textures. However, conventional neutron and X-ray texture analyses rely on pole figure inversion routines derived from intensity analysis of individual reflections or powder Rietveld analysis to reconstruct and model the orientation distribution from slices through reciprocal space. In this work, we describe an original approach to directly probe the crystallographic texture information of rolled aluminum from the intensity distribution in 3-dimensional reciprocal space volumes measured simultaneously. Using the TOPAZ time-of-flight Laue neutron diffractometer, reciprocal space analysis allowed determination of "pole spheres" with <1° angular resolution. These pole spheres are compared with reconstructed pole figures from classic texture analysis.
多晶材料的晶体学织构是这些材料的加工方式以及材料所经历的外力作用的结果。中子衍射和X射线衍射是表征整体晶体学织构的标准方法。然而，传统的中子和X射线织构分析依赖于从单个反射的强度分析或粉末Rietveld分析中推导出来的极图反演程序，以便从通过倒易空间的切片中重建和模拟取向分布。在这项工作中，我们描述了一种原始方法，可从同时测量的三维倒易空间体积中的强度分布直接探测轧制铝的晶体学织构信息。使用TOPAZ飞行时间劳厄中子衍射仪，倒易空间分析能够以小于1°的角分辨率确定“极球”。将这些极球与经典织构分析重建的极图进行比较。
