University of Cambridge > > St Catharine's College John Ray Society. > Sir Harry Bhadeshia: The First Bulk–Nanostructured Metal

Sir Harry Bhadeshia: The First Bulk–Nanostructured Metal

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All are welcome, drinks and snacks will be provided as customary for JRS of course. Would love to see many of you!

‘The First Bulk–Nanostructured Metal’

“This is a story about an elegant structure, consisting of slender crystals that grow within the solid steel. The crystals are typically 20-40 nm in thickness, finer than carbon nanotubes. There are so many of these crystals per unit of volume, that a material is created which has one of the highest density of interfaces known to man. And all this can be achieved in samples that are large in all three dimensions, without the use of deformation or rapid heat treatment, and at a cost which in terms of weight or volume compares with that of bottled–water. There is no new manufacturing technology required, the fabrication of the steel is conventional. But the heat-treatment is far from conventional, involving periods of up to ten days at 200◦C. The end result is a very hard, strong and tough material, a combination of properties never before achieved. The choreography of atoms during the solid-state transformation has a seminal role in determining the structure. I will describe how the material was discovered and the underlying phase transformations theory. Hundreds of tonnes of the material has been produced for application in a variety of specialised engineering applications such as shafts and armour. The new science associated with this material will be described.”

This talk is part of the St Catharine's College John Ray Society. series.

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