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利用ISIS的IMAT进行飞行时间能量分辨中子成像的二维单晶布拉格倾角映射。

2D single crystal Bragg-dip mapping by time-of-flight energy-resolved neutron imaging on IMAT@ISIS.

作者信息

Strickland Joel, Tassenberg Karl, Sheppard Gareth, Nenchev Bogdan, Perry Sam, Li Jun, Dong Hongbiao, Burca Genoveva, Kelleher Joe, Irwin Steve

机构信息

School of Engineering, University of Leicester, Leicester, LE1 7RH, UK.

ISIS Pulsed Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell Campus, Didcot, OX11 0QX, UK.

出版信息

Sci Rep. 2020 Nov 27;10(1):20751. doi: 10.1038/s41598-020-77572-3.

DOI:10.1038/s41598-020-77572-3
PMID:33247196
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7695711/
Abstract

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.

摘要

位于脉冲中子与μ子源ISIS的第二个靶站的冷中子成像与衍射仪IMAT，用于研究铸态单晶CMSX-4和CMSX-10镍基高温合金内部的整体镶嵌性。在本研究中，微通道板图像探测器内的每个像素都记录了中子透射谱。跟踪每个像素在指定布拉格凹陷内最低透射波长的移动。由此产生的布拉格凹陷位移实现了对块状单晶试样的晶体取向映射，具有良好的空间分辨率。每次测试收集足够统计数据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。可视化了(001)晶面的取向差，并观察到一种新的螺旋扭曲凝固现象。这项概念验证工作确立了飞行时间能量分辨中子成像作为理解和可视化金属单晶内部镶嵌性的基本表征工具，并为事后推断固/液等温线的形状奠定了基础。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/4488d0b886dc/41598_2020_77572_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/5408cc66941e/41598_2020_77572_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/a790cf4e4e54/41598_2020_77572_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/a2b1580e7996/41598_2020_77572_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/e50cc887e19b/41598_2020_77572_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/0a4a55242588/41598_2020_77572_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/ce7bf0b38e31/41598_2020_77572_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/7438a27d368c/41598_2020_77572_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/4b6b31f9158c/41598_2020_77572_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/4488d0b886dc/41598_2020_77572_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/5408cc66941e/41598_2020_77572_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/a790cf4e4e54/41598_2020_77572_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/a2b1580e7996/41598_2020_77572_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/e50cc887e19b/41598_2020_77572_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/0a4a55242588/41598_2020_77572_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/ce7bf0b38e31/41598_2020_77572_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/7438a27d368c/41598_2020_77572_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/4b6b31f9158c/41598_2020_77572_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a1cc/7695711/4488d0b886dc/41598_2020_77572_Fig9_HTML.jpg

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