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Advanced texture measurements on WOMBAT- A round robin with iMateria / J-PARC and JAEA

Crystallographic texture is preferred orientation of the crystallites due to anisotropic properties of how solid material is processed. During plastic deformation slip systems are activated, leading to grain rotation into preferred orientation. These may compete with other processes, such as twinning and recrystallization, forming peculiar fingerprints of texture. 

As the mechanical properties of such material are highly anisotropic, the knowledge, modeling, and engineering of texture is of utmost interest for industrial and practical applications. Furthermore, the thermo-mechanic history of an artifact can be determined through the help of texture analysis, which also applies to rocks in geological research and ice for the understanding of glaciers and climate. 

Because neutrons have a high penetration depth, textures from the bulk of a sample can be obtained. The capability of texture measurements at the OPAL facility has been initiated within the ThermoMec.Pro project. We have now set up the WOMBAT high-intensity diffractometer for the advanced measurement of texture.


Smart orientation sampling in unconventional steps is employed making full use of the large, two-dimensional detector. Scripting within the dataRring package exists to extract pole figures for the mtex texture package, while input scripts for the MAUD Rietveld program can be made, taking track of all orientation angles.

 
Dr. Pingguang Xu of JAEA, Japan has started a Round Robin project to measure in high resolution a set of different materials, exposing typical forming and annealing textures. The same samples have been measured at iMateria at J-PARC and MUSASI-L at JAEA, and will be measured at various neutron and synchrotron high-energy X-ray facilites around the world, including the KOWARI instrument at ANSTO.

– See more at: http://10.103.252.131/web-ansto/Highlights%20-%20ANSTO.htm#sthash.PfJiFbzy.dpuf

Figure: Texture of the Round Robin sample from a rolled magnesium sheet. The presented data has been measured on WOMBAT, transformed by dataRring and evaluated by mtex.
 
Main investigators: Pingguang Xu (QuBS, JAEA, Japan), Klaus-Dieter Liss (ANSTO), Koichi Akita (QuBS, JAEA, Japan).