Kawasaki et al. J. Mater. Sci. (2012) in press DOI: 10.1007/s10853-012-6507-y
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High-Pressure Torsion and Nanostructured Materials Terence G. Langdon, University of Southern California, DMR 0855009 High-pressure torsion (HPT) is a processing technique involving the application of a high pressure with concurrent torsional straining. Excellent grain refinement may be achieved using this process with the average grain size often reduced to the nanoscale range. Much attention has been given recently to the possibility of developing microstructural homogeneity in disks processed by HPT. However, all publications to date have concentrated on taking hardness measurements on planar sections but we have now extended this approach to also record hardness measurements on vertical sections cut through the disks. An example is shown on the right for high-purity aluminum processed through from ¼ turn (upper sample) to 20 turns (lower sample). The microhardness values are represented by colors and the color key is given Kawasaki et al. J. Mater. Sci. (2012) in press DOI: 10.1007/s10853-012-6507-y
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High-Pressure Torsion and Nanostructured Materials Terence G. Langdon, University of Southern California, DMR 0855009. - PowerPoint PPT Presentation
Transcript of Kawasaki et al. J. Mater. Sci. (2012) in press DOI: 10.1007/s10853-012-6507-y
High-Pressure Torsion and Nanostructured Materials
Terence G. Langdon, University of Southern California, DMR 0855009
High-pressure torsion (HPT) is a processing technique involving the application of a high pressure with concurrent torsional straining. Excellent grain refinement may be achieved using this process with the average grain size often reduced to the nanoscale range.
Much attention has been given recently to the possibility of developing microstructural homogeneity in disks processed by HPT. However, all publications to date have concentrated on taking hardness measurements on planar sections but we have now extended this approach to also record hardness measurements on vertical sections cut through the disks. An example is shown on the right for high-purity aluminum processed through from ¼ turn (upper sample) to 20 turns (lower sample). The microhardness values are represented by colors and the color key is given on the right.
The results show that excellent homogeneity is developed in the through-thickness of pure aluminum after 20 turns of HPT.
Kawasaki et al. J. Mater. Sci. (2012) in pressDOI: 10.1007/s10853-012-6507-y
High-Pressure Torsion and Nanostructured Materials
Terence G. Langdon, University of Southern California, DMR 0855009
We have presented papers describing our work at several international conferences including BNM-2011 in Russia, ISPMA-12 in the Czech Republic, the European MRS meeting in Poland and the Brazilian MRS meeting. The photo shows (from left) Prof. Langdon, graduate students Shima Sabbaghianrad and Jittraporn Wongsa-Ngam and post-doc Dr. Megumi Kawasaki at the TMS Annual Meeting in Orlando, Florida, in March 2012.
Based on her excellent research, Jittraporn Wongsa-Ngam was one of 50 graduate studentsselected world-wide to join 50 Brazilian graduate students for the First School of AdvancedStudies in Materials Science and Engineering held in São Carlos, Brazil, in March 2012.
Jittraporn is marked with an arrow
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