Validating texture and lattice strain evolution models via in-situ neutron diffraction and shear tests

Texture changes in the hcp! bcc! hcp transformation of zirconium studied in situ by neutron diffraction

The crystallographic texture of hot-rolled polycrystalline zirconium has been studied below and above the hcp–bcc transition temperature with HIPPO, the new time-of-flight neutron diffractometer at Los Alamos Neutron Science Center, making use of the multidetector capabilities and a vacuum furnace. Incomplete pole figures were extracted from diffraction spectra to determine the orientation dist...

Engineering Related Neutron Diffraction Measurements Probing Strains, Texture and Microstructure

Neutron diffraction has been used for engineering applications for nearly three decades. The basis of the technique is powder diffraction following Bragg’s Law. The measured diffraction patterns provide information about internal strains, texture and microstructure, which can be deduced from the peak positions, peak intensities, and peak widths, respectively. Most structural materials are aniso...

In situ Elastic Strain Measurements-Diffraction and Spectroscopy

Visualizing the Structural Evolution of LSM/xYSZ Composite Cathodes for SOFC by in-situ Neutron Diffraction

Thermal stability of composite cathodes for solid oxide fuel cells, the mixtures of (La0.8Sr0.2)0.95MnO(3-δ) (LSM) and (Y2O3)(x)(ZrO2)(1-x) (xYSZ, x = 3, 6, 8 and 10), is determined using in-situ neutron diffraction. Thanks to the most advanced high flux neutron source, our work highlights the visualization of the phase evolutions in heterogeneous material systems at high temperatures, along wi...

Study on Measurement Technique for Lattice Spacing at Strain Free by Neutron Diffraction Method

For precise stress analysis of engineering materials by diffraction methods, the lattice spacing of strain-free materials, d0, must be accurately measured and determined. In this study, a new and easy technique of measuring the specimen is proposed which involves using the original material instead of its powder form for accurate estimation of d0 . The value of d0 obtained by our technique is e...