scholarly journals Advances and Applications of Neutron Texture Analysis

1999 ◽  
Vol 33 (1-4) ◽  
pp. 13-33 ◽  
Author(s):  
H.-G. Brokmeier
Keyword(s):  
Neutron Diffraction ◽  
Texture Analysis ◽  
Basic Research ◽  
Coarse Grained ◽  
Thermal Neutrons ◽  
Efficient Tool ◽  
High Penetration ◽  
Phase Systems ◽  
Multi Phase ◽  
Non Destructive

Due to the high penetration depth of thermal neutrons for most materials, neutron diffraction is an efficient tool for bulk texture analysis. The main applications are investigations of coarse-grained materials, non-destructive pole figure measurements of identical samples at different states, detection of weak textures, measurement of unprepared samples and texture investigations of multi-phase systems. It should be pointed out that neutron texture analysis is suitable for basic research as well as for applications.

scholarly journals Neutron Diffraction Texture Analysis of Multi-Phase Systems

1989 ◽  
Vol 10 (4) ◽  
pp. 325-346 ◽  
Author(s):  
H.-G. Brokmeier
Keyword(s):  
Neutron Diffraction ◽  
Penetration Depth ◽  
Texture Analysis ◽  
Special Interest ◽  
X Rays ◽  
X Ray Diffraction ◽  
Efficient Tool ◽  
X Ray ◽  
Phase Systems ◽  
Multi Phase

Neutron diffraction methods for texture analysis are closely parallel to well-known X-ray diffraction techniques. The chief advantage of neutron diffraction over X-ray diffraction, however, arises from the fact that the interaction of neutrons with matter is relatively weak, and consequently the penetration depth of neutrons is 102–103 times larger than that of X-rays. Hence neutron diffraction is an efficient tool for measuring textures in multi-phase systems. Based on the high transmission of a neutron beam the effect of anisotropic absorption in multi-phase materials can be neglected in most cases. Moreover, the analysis of bulk textures becomes possible, such that textures in a wide variety of multi-phase systems can be studied which are of special interest in engineering and science (metals, alloys, composites, ceramics and geological specimens).

scholarly journals Neutron diffraction strain mapping in engineering materials

2014 ◽  
Vol 70 (a1) ◽  
pp. C732-C732
Author(s):  
Edward Payzant ◽  
Lindsay Sochalski-Kolbus
Keyword(s):  
Neutron Diffraction ◽  
Strain Mapping ◽  
Friction Stir ◽  
Lattice Strains ◽  
High Penetration ◽  
Residual Strains ◽  
Engineering Materials ◽  
And Performance ◽  
Non Destructive ◽  
Ods Alloy

Bragg peak positions with precisions of a few parts in 10^4 are typically necessary to provide the strain resolution required for measurement of the residual strains in bulk materials. Neutron diffraction, mainly because of its high penetration in many engineering materials, provides a unique non-destructive capability for strain measurement. Dedicated instruments for mapping lattice strains using neutron diffraction, a technique first demonstrated in the 1980s, are found at all major neutron scattering facilities around the world. Residual stresses typically arise during synthesis, forming, joining, thermal processing, or use of engineering materials and can significantly impact the strength and performance of the final part. We present two recent examples of strain-mapping experiments conducted at the HB-2B beamline at the High Flux Isotope Reactor. Strain-mapping data collected on a friction stir welded ODS alloy reveals changes in texture and stress resulting from the FSW process, and dependent on the FSW process variables. Mapping experiments on steel conduit intended for the ITER project show the strain distribution from the forming operations, and the partial reduction of these strains through high temperature annealing.

Non-destructive texture analysis of cereal products

2004 ◽  
Vol 37 (6) ◽  
pp. 603-610 ◽  
Author(s):  
Grazina Juodeikiene ◽  
Loreta Basinskiene
Keyword(s):  
Texture Analysis ◽  
Cereal Products ◽  
Non Destructive

Rietveld texture analysis from TOF neutron diffraction data

2010 ◽  
Vol 25 (3) ◽  
pp. 283-296 ◽  
Author(s):  
H.-R. Wenk ◽  
L. Lutterotti ◽  
S. C. Vogel
Keyword(s):  
Neutron Diffraction ◽  
Texture Analysis ◽  
Electron Backscatter Diffraction ◽  
Computer Code ◽  
Preferred Orientation ◽  
Complex Data ◽  
Ambient Conditions ◽  
Science Center ◽  
Step Procedure ◽  
Backscatter Diffraction

One of the advantages of a multidetector neutron time-of-flight diffractometer such as the high pressure preferred orientation diffractometer (HIPPO) at the Los Alamos Neutron Science Center is the capability to measure efficiently preferred orientation of bulk materials. A routine experimental method for measurements, both at ambient conditions, as well as high or low temperatures, has been established. However, only recently has the complex data analysis been streamlined to make it straightforward for a noninitiated user. Here, we describe the Rietveld texture analysis of HIPPO data with the computer code Materials Analysis Using Diffraction (MAUD) as a step-by-step procedure and illustrate it with a metamorphic quartz rock. Postprocessing of the results is described and neutron diffraction results are compared with electron backscatter diffraction measurements on the same sample.

scholarly journals A new paradigm on the chemical potentials of components in multi-component nano-phases within multi-phase systems

RSC Advances ◽  
2017 ◽  
Vol 7 (65) ◽  
pp. 41241-41253 ◽  
Author(s):  
George Kaptay
Keyword(s):  
New Paradigm ◽  
Surface Areas ◽  
Chemical Potentials ◽  
Multiphase Systems ◽  
Phase Systems ◽  
Multi Phase

A new paradigm is offered claiming that the thermodynamic nano-effect in multi-component and multiphase systems is proportional to the increased surface areas of the phases and not to their increased curvatures (as the Kelvin paradigm claims).

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