Abstract
As a new method for evaluating single crystals and oligocrystals, pulsed neutron Bragg-dip transmission analysis/imaging method is being developed. In this study, a single Bragg-dip profile-fitting analysis method was newly developed, and applied for analyzing detailed inner information in a crystalline grain position-dependently. In the method, the spectrum profile of a single Bragg-dip is analyzed at each position over a grain. As a result, it is expected that changes in crystal orientation, mosaic spread angle and thickness of a perfect crystal can be evaluated from the wavelength, the width and the integrated intensity of the Bragg-dip, respectively. For confirming this effectiveness, the method was applied to experimental data of position-dependent Bragg-dip transmission spectra of a Si-steel plate consisting of oligocrystals. As a result, inner information of multiple crystalline grains could be visualized and evaluated. The small change in crystal orientation in a grain, about 0.4°, could be observed by imaging the Bragg-dip wavelengths. By imaging the Bragg-dip widths, both another grain and mosaic block in a grain were detected. Furthermore, imaging results of the integrated intensities of Bragg-dips were consistent with the results of Bragg-dip width imaging. These small crystallographic changes have not been observed and visualized by previous Bragg-dip analysis methods.
Highlights
There are various quantum beam methods for evaluating crystallographic information of single crystals and polycrystals
The Gaussian function was fitted to an individual Bragg-dip profile on the neutron transmission spectrum
From the results of imaging the broadening of Bragg-dip, a mosaic block could be observed in the crystalline grain
Summary
There are various quantum beam methods for evaluating crystallographic information of single crystals and polycrystals. The full pattern-fitting analysis method of the Bragg-dip neutron transmission spectrum was developed by Malamud et al [18] This method can evaluate detailed crystallographic information of a single crystal. In this study, a new Bragg-dip neutron transmission spectrum analysis method was developed and applied to position-dependent oligocrystal evaluation. It is the single Bragg-dip profile-fitting analysis method. In this study, we developed the single Bragg-dip profile-fitting analysis method This method was applied to experimental data of position-dependent Braggdip neutron transmission spectra measured from an oligocrystal material [19] to confirm the effectiveness of the new approach. 4, the imaging results ofgrains singleisBragg-dip described, and newly evaluated crystalline information in crystalline grains is discussed
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