D045 Residual Strain Determination by Rietveld Refinement of TOF Neutron-Diffraction Measurements on Deformed Uranium

2003 ◽  
Vol 18 (2) ◽  
pp. 172-172
Author(s):  
D. Balzar ◽  
G. Stefanic ◽  
S. Vogel ◽  
D. Brown ◽  
M. Bourke ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Rietveld Refinement ◽  
Residual Strain ◽  
Strain Determination

Measurement of Atomic Elastic Constants by Pulsed Neutron Powder Diffraction

1992 ◽  
Vol 36 ◽  
pp. 577-583
Author(s):  
A. C. Lawson ◽  
G. H. Kwei ◽  
J. A. Goldstone ◽  
B. Cort ◽  
R. I. Sheldon ◽  
...  
Keyword(s):  
High Temperature ◽  
Neutron Diffraction ◽  
Rietveld Refinement ◽  
Powder Diffraction ◽  
Elastic Constants ◽  
Diffraction Data ◽  
High Temperature Superconductors ◽  
Neutron Powder Diffraction ◽  
Neutron Diffraction Data ◽  
Pulsed Neutron

AbstractWe have developed a technique for determining the atomic elastic constants from measurements of the Debye-Waller factors. The Debye-Waller factors are obtained by Rietveld refinement of time-of-flight neutron diffraction data and interpreted in terms of an atomic Debye-Waller temperature. The method is applicable to powders and to materials that must be encapsulated for safety or environmental reasons. We will illustrate our technique with applications to actinide metals, to metallic hydrides and to high-temperature superconductors.

Combined X-ray and neutron diffraction Rietveld refinement in iron-substituted nano-hydroxyapatite

2013 ◽  
Vol 48 (9) ◽  
pp. 3535-3545 ◽  
Author(s):  
A. Kyriacou ◽  
Th. Leventouri ◽  
B. C. Chakoumakos ◽  
V. O. Garlea ◽  
C. B. dela Cruz ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Rietveld Refinement ◽  
X Ray

Neutron Diffraction as a Tool for Non-Destructive Evaluation of Ceramics

1988 ◽  
Vol 142 ◽  
Author(s):  
John H. Root ◽  
James D. Sullivan
Keyword(s):  
Grain Size ◽  
Neutron Diffraction ◽  
Residual Strain ◽  
Mechanical Characteristics ◽  
Condensed Matter ◽  
Ceramic Composites ◽  
Non Destructive Evaluation ◽  
Minority Phase ◽  
Position Dependence ◽  
Non Destructive

AbstractNeutron diffraction is a powerful probe of the properties of condensed matter. In recent years neutron diffraction has been applied to the non-destructive evaluation of mechanical characteristics of engineering components. This paper presents examples of applications to ceramic composites including the measurement of position dependence of residual strain, grain size and minority phase concentration. In addition, an example of volume-averaged crystallographic texture is presented.

Bayesian method for the analysis of diffraction patterns usingBLAND

2016 ◽  
Vol 49 (6) ◽  
pp. 2201-2209 ◽  
Author(s):  
Joseph E. Lesniewski ◽  
Steven M. Disseler ◽  
Dylan J. Quintana ◽  
Paul A. Kienzle ◽  
William D. Ratcliff
Keyword(s):  
Neutron Diffraction ◽  
Rietveld Refinement ◽  
A Priori ◽  
Rietveld Analysis ◽  
Inorganic Materials ◽  
Attractive Alternative ◽  
Local Minima ◽  
Bayesian Algorithm ◽  
Magnetic Structures ◽  
Diffraction Patterns

Rietveld refinement of X-ray and neutron diffraction patterns is routinely used to solve crystal and magnetic structures of organic and inorganic materials over many length scales. Despite its success over the past few decades, conventional Rietveld analysis suffers from tedious iterative methodologies, and the unfortunate consequence of many least-squares algorithms discovering local minima that are not the most accurate solutions. Bayesian methods which allow the explicit encoding ofa prioriknowledge pose an attractive alternative to this approach by enhancing the ability to determine the correlations between parameters and to provide a more robust method for model selection. Global approaches also avoid the divergences and local minima often encountered by practitioners of the traditional Rietveld technique. The goal of this work is to demonstrate the effectiveness of an automated Bayesian algorithm for Rietveld refinement of neutron diffraction patterns in the solution of crystallographic and magnetic structures. A new software package,BLAND(Bayesian library for analyzing neutron diffraction data), based on the Markov–Chain Monte Carlo minimization routine, is presented. The benefits of such an approach are demonstrated through several examples and compared with traditional refinement techniques.

scholarly journals Measuring residual strain and stress in thermal spray coatings using neutron diffractometers

2021 ◽  
Author(s):  
Nadimul Haque Faisal ◽  
Rehan Ahmed ◽  
Anil K Prathuru ◽  
Anna Paradowska ◽  
Tung Lik Lee
Keyword(s):  
Neutron Diffraction ◽  
Diffraction Analysis ◽  
Thermal Spray ◽  
Residual Strain ◽  
Spray Coating ◽  
Thermal Spray Coating ◽  
Thermal Spray Coatings ◽  
Neutron Sources ◽  
Neutron Diffraction Analysis ◽  
Spray Coatings

Abstract Background: During thermal spray coating, residual strain is formed within the coating and substrates due to thermo-mechanical processes and microstructural phase changes. Objective: This paper provides a comprehensive guide to researchers planning to use neutron diffraction technique for thermal spray coatings, and reviews some of these studies. Methods: ENGIN-X at the ISIS spallation source is a neutron diffractometer (time-of-flight) dedicated to materials science and engineering with high resolution testing. The focus is on the procedure of using ENGIN-X diffractometer for thermal spray coatings with a view that it can potentially be translated to other diffractometers. Results: Number of studies involving neutron diffraction analysis in thermal spray coatings remain limited, partly due to limited number of such strain measurement facilities globally, and partly due to difficulty is applying neutron diffraction analysis to measure residual strain in the thermal spray coating microstructure. Conclusions: This technique can provide a non-destructive through-thickness residual strain analysis in thermally sprayed components with a level of detail not normally achievable by other techniques. Neutron sources have been used to measure strains in thermal spray coatings, and here, we present examples where such coatings have been characterised at various neutron sources worldwide, to study residual strains and microstructures.

Sign in / Sign up

Export Citation Format

Share Document