[1]潘志豪,周光妮,陈凯.晶体材料微观结构的同步辐射白光劳厄微衍射研究[J].中国材料进展,2017,(3):011-15.[doi:10.7502/j.issn.1674-3962.2017.03.03]
　PAN Zhihao,ZHOU Guangni,CHEN Kai.Synchrotron Polychromatic X-ray Laue Microdiffraction Study on the Microstructures of Crystalline Materials[J].MATERIALS CHINA,2017,(3):011-15.[doi:10.7502/j.issn.1674-3962.2017.03.03]
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晶体材料微观结构的同步辐射白光劳厄微衍射研究()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2017年第3期
页码:
011-15
栏目:
前沿综述
出版日期:
2017-03-31

文章信息/Info

Title:
Synchrotron Polychromatic X-ray Laue Microdiffraction Study on the Microstructures of Crystalline Materials
作者:
潘志豪; 周光妮; 陈凯
西安交通大学 金属材料强度国家重点实验室
Author(s):
PAN Zhihao;  ZHOU Guangni;  CHEN Kai
Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
关键词:
白光劳厄微衍射; 晶体结构; 晶体取向; 微观应变; 缺陷
Keywords:
polychromatic X-ray Laue microdiffraction;  Crystal structure;  Crystal orientation;  Microscopic strain;  Defect
DOI:
10.7502/j.issn.1674-3962.2017.03.03
文献标志码:
A
摘要:
伴随着特种聚焦镜的出现和同步辐射技术的发展，利用微聚焦的同步辐射多波长X射线进行白光劳厄微衍射成为了可能。通过白光劳厄微衍射实验，可以对材料局域微观结构进行无损定量表征，并建立材料的微观特性与机械性能间的关系。本文以脆性多晶Nd2Ir2O7材料及激光3D打印的镍基高温合金材料的为研究案例，体现了同步辐射白光劳厄微衍射技术在研究非均一的多相多晶材料的晶体取向、晶格畸变、缺陷类型和密度等重要微观结构信息方面的特点与优势。随着数据采集和数据分析的飞跃式发展，即使以微小的步长对样品上一个较大的区域进行劳厄微衍射实验，也可以近乎实时的获得晶体材料微观结构的定量图像。同步辐射白光劳厄微衍射发展至今已有20年，并且新的同步辐射纳米衍射线站正在全世界范围内建设和服役，这里简单概括其实验设施、当前应用、最新技术发展、以及未来可能涉及的领域，并借此激励越来越多的中国学者利用同步辐射白光劳厄微衍射进行材料科学的研究。
Abstract:
With the advent of efficient brightness-preserving X-ray focusing optics and synchrotron radiation-based techniques, local crystal structure, orientation, microscopic elastic strain/stress, and defect type and density can all be probed with a single scan of micro-focused synchrotron polychromatic X-ray Laue diffraction (?XRD), and these microstructural features can be further related to the mechanical and physical properties of the crystals. The ?XRD technique is particularly suitable for the non-destructive and quantitative mapping of the microstructural characteristics of inhomogeneous multiphase polycrystalline samples, as well as imperfect epitaxial crystals, without involving any critical sample preparation procedures. In this paper, three examples are introduced in details. First of all, the orientation distribution Nd2Ir2O7 polycrystals, which are brittle and virtually impossible for fine surface polishing, is mapped using the ?XRD technique and related to its unique electrical conductance distribution. Secondly, the elastic lattice strain distribution in laser 3D printed Ni-based superalloy is studied and compared to the case in cast bulk materials. Finally, the defect type (mainly dislocations) and density are thoroughly mapped from the matrix to the cladding layers of a laser 3D printed Ni-based superalloy. By studying the nano-hardness of the same region using the technique of nano-indentation, the mechanical properties are successfully linked with the dislocation densities. As ?XRD enters its 20th year of existence and new synchrotron nanodiffraction facilities are being built and commissioned around the world, two dimensional or even three dimensional scans on the testing specimens with tiny scanning steps become possible and giant amount of Laue diffraction data are collected. Therefore new data analysis algorithms and tools are being developed. In this paper we briefly review the new achievements and trends in this field. We take the opportunity to overview the current capabilities as well as the latest technical developments, and hopefully can spur more and more Chinese researchers and scientists to take advantage of the powerful ?XRD materials study technique.
更新日期/Last Update: 2017-02-28