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SUMMARY:Metallic glasses - Lindsay Greer (Dept. Materials Science and Meta
 llurgy)
DTSTART:20110131T160000Z
DTEND:20110131T170000Z
UID:TALK29437@talks.cam.ac.uk
CONTACT:Ian Farnan
DESCRIPTION:Metallic alloys are parvenus in the world of glasses\, but the
 y have recently been attracting much attention\, and are very actively res
 earched at present.  Metallic crystal structures are simple\, and metallic
  liquids have viscosities similar to water\, so it is difficult to achieve
  the glassy state in metals\; indeed it has traditionally been assumed tha
 t melt cooling rates of the order of 106 K s−1 are necessary.  However\,
  it has become clear that with well-tailored alloy compositions\, rapid co
 oling is not necessary\, and bulk metallic glasses (BMGs) can be made\, fo
 r example as cylinders with a diameter of up to a few centimetres.  Intere
 stingly\, the BMG-forming compositions can be very tightly defined\, sugge
 sting that these materials are akin to stoichiometric compounds\, albeit w
 ith non-crystalline structure.  They can also be anisotropic\, as is being
  explored currently using the RUS facilities in the Dept. of Earth Science
 s.  The advent of BMGs has excited interest\, and this presentation will r
 eview recent developments in understanding their formation\, their atomic-
 level structure and its relaxation\, and their elastic and mechanical prop
 erties.  A recurring theme will be that there are remarkably good correlat
 ions linking the properties of metallic glasses\, and that these can usefu
 lly be put in the context of other classes of glassy materials.\n\n“Meta
 llic glasses… on the threshold”  A. L. Greer\, Materials Today 12 (200
 9) 14-22.\n\n“A damage-tolerant glass”  M. D. Demetriou et al.\, Natur
 e Materials (February 2011)\, available though advance online publication.
 \n
LOCATION:Harker 2 lecture room\, Department of Earth Sciences\, Downing Si
 te
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