Progress of material characterization techniques based on neutron Bragg-edge transmission imaging
With the rapid development of spallation neutron source large-scale scientific facility technologies,the neutron beam flux that can be obtained has been significantly enhanced,and the neutron imaging technique has been also further developed.Due to the limitation of neutron beam flux,the conventional neutron imaging techniques require neutron beam with wide wavelength range to obtain relatively high flux conditions.In recent years,the high-flux pulsed neutron beam has been obtained via the large accelerator spallation neutron source.The energy(wavelength)resolved neutron imaging tech-nique based on Bragg-edge effect,i.e.,neutron Bragg-edge transmission imaging technology,has showed a wide applica-tion potential due to its high energy resolution,high spatial resolution and the ability to detect the crystallographic informa-tion.The fundamental principle of this technology was briefly introduced.Some application cases in residual strain,phase composition,dislocation density and oriented structure characterization were reviewed to play a positive role in the populari-zation of relevant techniques.
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