Extracting grain-orientation-dependent data from in situ time-of-flight neutron diffraction. I. Inverse pole figures

• Published in: Journal of applied crystallography Vol. 47; no. 6; pp. 2019 - 2029
• Main Authors: Stoica, G. M., Stoica, A. D., An, K., Ma, D., Vogel, S. C., Carpenter, J. S., Wang, X.-L.
• Format: Journal Article
• Language: English
• Published: 5 Abbey Square, Chester, Cheshire CH1 2HU, England International Union of Crystallography 01.12.2014; Blackwell Publishing Ltd
• Subjects: Aluminum base alloys; Austenitic stainless steels; Computer simulation; Crystallography; Diffraction; grain orientation; Inverse; inverse pole figure; inverse pole figures; Mathematical analysis; Monte Carlo methods; Neutron diffraction; Neutrons; NUCLEAR PHYSICS AND RADIATION PHYSICS; Pole figures; texture analysis; thermomechanical behavior; time-of flight neutron diffraction; TOF; VULCAN; Weighting
• ISSN: 1600-5767; 0021-8898; 1600-5767
• DOI: 10.1107/S1600576714023036

The problem of calculating the inverse pole figure (IPF) is analyzed from the perspective of the application of time‐of flight neutron diffraction to in situ monitoring of the thermomechanical behavior of engineering materials. On the basis of a quasi‐Monte Carlo (QMC) method, a consistent set of grain orientations is generated and used to compute the weighting factors for IPF normalization. The weighting factors are instrument dependent and were calculated for the engineering materials diffractometer VULCAN (Spallation Neutron Source, Oak Ridge National Laboratory). The QMC method is applied to face‐centered cubic structures and can be easily extended to other crystallographic symmetries. Examples include 316LN stainless steel in situ loaded in tension at room temperature and an Al–2%Mg alloy, substantially deformed by cold rolling and in situ annealed up to 653 K.