The cold neutron imaging and diffraction instrument IMAT, at the second target station of the pulsed neutron and muon source ISIS, is used to investigate bulk mosaicity within as-cast single crystal CMSX-4 and CMSX-10 Ni-base superalloys. Within this study, neutron transmission spectrum is recorded by each pixel within the microchannel plate image detector. The movement of the lowest transmission wavelength within a specified Bragg-dip for each pixel is tracked. The resultant Bragg-dip shifting has enabled crystallographic orientation mapping of bulk single crystal specimens with good spatial resolution. The total acquisition time required to collect sufficient statistics for each test is ~ 3 h. In this work, the influence of a change in bulk solidification conditions on the variation in single crystal mosaicity was investigated. Misorientation of the (001) crystallographic plane has been visualised and a new spiral twisting solidification phenomena observed. This proof of concept work establishes time-of-flight energy-resolved neutron imaging as a fundamental characterisation tool for understanding and visualising mosaicity within metallic single crystals and provides the foundation for post-mortem deduction of the shape of the solid/liquid isotherm.

在脉冲中子和μ子源ISIS的第二目标站处，冷中子成像和衍射仪IMAT用于研究铸态单晶CMSX-4和CMSX-10 Ni基高温合金中的整体镶嵌性。在这项研究中，中子透射光谱由微通道板图像检测器中的每个像素记录。跟踪每个像素在指定的Brag-dip范围内最低透射波长的运动。由此产生的布拉格-浸没位移已使具有良好空间分辨率的大块单晶标本的晶体学取向图成为可能。收集每个测试的足够统计信息所需的总采集时间约为3小时。在这项工作中，研究了整体凝固条件的变化对单晶镶嵌性变化的影响。（001）晶面的取向错误已可视化，并观察到新的螺旋扭曲凝固现象。这项概念验证工作将飞行时间的能量分辨中子成像确立为一种基本的表征工具，用于理解和可视化金属单晶中的镶嵌性，并为事后推断固/液等温线的形状提供了基础。