Application of Neutron Scattering Technique in Material Service and Failure Behavior Evaluation

Jie Chen^1,2，Lunhua He^1,3，Chunming Hu^1,2，Yubin Ke^1,2，Tao Zhu^1,3，Junrong Zhang^1,2，Fangwei Wang^1,3，Tianjiao Liang^1,2*，

¹ Spallation Neutron Source Science Center, Dongguan, Guangdong 523803

² Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049

³ Institute of Physics, Chinese Academy of Sciences, Beijing 100190

ABSTRACT: Information such as displacement, deformation, grain size, interface and crystal structures are the basic parameters for studying material behavior and failure evaluation and structural mechanics. The measurement and analysis of these parameters are facing a series of difficult problems, such as the high-precision measurement of 3D microstructures, the structural research between micro areas and interfaces, the distribution of elements and components, the evolution of crystal structure and internal defect damage, and so on, which seriously restrict the development of major equipment and related high-end manufacturing industry in China. However, neutron scattering technology provides the possibility to solve the above problems, as neutron has unique superiority including strong penetration ability, sensitivity to light elements, discrimination of neighboring elements and intrinsic magnetic moment. Since September 2018, Chinese Spallation Neutron Source (CSNS) was officially opened to users when three instruments completed in the first phase. Eight cooperative instruments are currently under construction. These instruments can provide neutron diffraction to study crystal structure, conventional neutron imaging to study internal 3D microstructure, energy-resolved neutron imaging to study distribution of crystal structure, neutron small angle scattering to study structure information in nanoscale, and neutron reflection to study interface and surface structure. These characterization technologies offer abundant parameter information which cover from atomic scale to decimeter scale, to study structure-activity relationship, structure and service performance regulation mechanism of materials under the micro, meso and macro scales. Furthermore, in order to promote neutron scattering technology in material performance research, service and failure behavior research. It is necessary to directed develop key scientific and technical methods, such as multi-information fusion method, in-situ characterization technology, and establishment of maturity models.

 Figure 1.  Figure’s caption is in TNR font size 10 points.

Keywords: Neutron scattering technique；CSNS；Service and failure behavior evaluation；In situ characterization technique.