New X-Ray microbeam answers 20-year-old metals question

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Novel 3-D microbeam experiment enables direct proof of the Mughrabi model of metal stress. Submicron X-ray beam (broad arrow) penetrates a deformed copper single crystal and is diffracted onto a CCD detector. Platinum wire profiler (circle) traverses ...
Novel 3-D microbeam experiment enables direct proof of the Mughrabi model of metal stress. Submicron X-ray beam (broad arrow) penetrates a deformed copper single crystal and is diffracted onto a CCD detector. Platinum wire profiler (circle) traverses the sample and successively intercepts diffracted X-rays, providing depth measurement and allowing strains to be measured from individual dislocation cells. Credit: NIST

What happens to metals when you bend them? The question isn't as easy as you may think. A research team from the National Institute of Standards and Technology, Oak Ridge National Laboratory, and the University of Southern California, using a unique X-ray probe, has gathered the first direct evidence showing that, on average, a 20-year-old model is a useful predictor of stresses and strains in deformed metal.


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