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SUMMARY:Sir Harry Bhadeshia: The First Bulk–Nanostructured Metal - Sir H
 arry Bhadeshia\, Department of Materials Science and Metallurgy\, Cambridg
 e
DTSTART:20191017T170000Z
DTEND:20191017T190000Z
UID:TALK132328@talks.cam.ac.uk
CONTACT:74548
DESCRIPTION:All are welcome\, drinks and snacks will be provided as custom
 ary for JRS of course. Would love to see many of you!\n\n'The First Bulk
 –Nanostructured Metal'\n\n"This is a story about an elegant structure\, 
 consisting of slender crystals that grow within the solid steel. The cryst
 als are typically 20-40 nm in thickness\, finer than carbon nanotubes. The
 re are so many of these crystals per unit of volume\, that a material is c
 reated which has one of the highest density of interfaces known to man. An
 d all this can be achieved in samples that are large in all three dimensio
 ns\, without the\nuse of deformation or rapid heat treatment\, and at a co
 st which in terms of weight or volume compares with that of bottled–wate
 r. There is no new manufacturing technology required\,\nthe fabrication of
  the steel is conventional. But the heat-treatment is far from conventiona
 l\, involving periods of up to ten days at 200◦C. The end result is a ve
 ry hard\, strong and tough\nmaterial\, a combination of properties never b
 efore achieved.\nThe choreography of atoms during the solid-state transfor
 mation has a seminal role in determining the structure. I will describe ho
 w the material was discovered and the underlying phase transformations the
 ory. Hundreds of tonnes of the material has been produced for application 
 in a variety of specialised engineering applications such as shafts and ar
 mour. The new science associated with this material will be described."
LOCATION:Ramsden Room\, St Catharine's College\, Cambridge
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