| Topic: |
Science > Physics |
| User: |
"Sam Wormley" |
| Date: |
08 Jul 2004 03:39:08 PM |
| Object: |
Microscopy moves to 4D |
Ref: http://physicsweb.org/article/news/8/7/4
Material scientists from Denmark have developed an X-ray microscope
that can follow the changes that take place in a metal during the
process of recrystallization in three spatial dimensions and one time
dimension. Preliminary results obtained with the device show that the
growth of metallic grains during the process is less smooth and
regular growth than predicted by theory (S Schmidt et al. 2004
Science 305 229). Recrystallization is an important step in the
production of metals.
"We are now able to see in-situ the full three dimensional shape of a
single grain as it evolves during recrystallization in the interior
of a sample," says Soeren Schimdt of the Riso National Laboratory in
Denmark. "One could say that we have a full four dimensional (4D)
description of the grain. This is the first time ever this has been
obtained."
The four-dimensional microscope is a modified version of the Three
Dimensional X-Ray Diffraction (3DXRD) microscope at the European
Synchrotron Radiation Facility (ESRF) in Grenoble. Schimdt and
colleagues from Riso and the ESRF used a beam of 50 keV X-rays from
the ESRF to study a single crystal of aluminium that had been
deformed enough to ensure that recrystallization would occur.
See: http://physicsweb.org/article/news/8/7/4
.
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| User: "Andrew Resnick" |
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| Title: Re: Microscopy moves to 4D |
09 Jul 2004 07:09:43 AM |
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In <40EDB0EA.1A1A9A50@mchsi.com> Sam Wormley wrote:
Ref: http://physicsweb.org/article/news/8/7/4
Material scientists from Denmark have developed an X-ray microscope
that can follow the changes that take place in a metal during the
process of recrystallization in three spatial dimensions and one
time dimension. Preliminary results obtained with the device show
that the growth of metallic grains during the process is less smooth
and regular growth than predicted by theory (S Schmidt et al. 2004
Science 305 229). Recrystallization is an important step in the
production of metals.
"We are now able to see in-situ the full three dimensional shape of
a single grain as it evolves during recrystallization in the
interior of a sample," says Soeren Schimdt of the Riso National
Laboratory in Denmark. "One could say that we have a full four
dimensional (4D) description of the grain. This is the first time
ever this has been obtained."
<snip>
It may be the first time time-series images of crystallization in a
metal has been obtained, but 4D 'images' of crystallization/glass
dynamics/phase chages have been around for several years:
http://www.deas.harvard.edu/projects/weitzlab/
http://www.physics.emory.edu/~weeks/
--
Andrew Resnick, Ph. D.
National Center for Microgravity Research
NASA Glenn Research Center
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