A new treatment tested on a high-quality steel alloy results in remarkable strength and flexibility, qualities often seen as a trade-off rather than a combination. Ultra-fine metal grains that the treatment produced in the outermost layer of steel appear to stretch, rotate and then elongate under st
A novel treatment on T-91 steel alloy has resulted in a stronger and more ductile version called G-T91, with ultra-fine metal grains showing super-plasticity. This discovery by Purdue University and Sandia National Laboratories could revolutionize applications like car axles and suspension cables, but the exact mechanism remains a mystery.results in remarkable strength and flexibility, qualities often seen as a trade-off rather than a combination.
Metals like steel may look monolithic to the naked eye, but when greatly magnified, a metal bar reveals itself to be a conglomeration of individual crystals called grains. When a metal is subjected to strain, the grains are able deform in such a way that the metallic structure is maintained without rupturing, allowing the metal to stretch and bend.
While the research team had hypothesized that the gradient nanostructured G-T91 would perform better than standard T-91, scanning electron microscopy images taken at intervals during the tension testing reveal a mystery. Electron backscattered diffraction images taken at a scanning electron microscope at Sandia show how grains in the nanolaminate of the G-T91 change at increasing intervals of true strain, a measure of plasticity, from 0% to 120%.
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