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SUMMARY:Isolation of atomic mechanisms – the choreographer at play - Pro
 fessor Sir Harry Bhadeshia\, Emeritus Tata Steel Professor Metallurgy
DTSTART:20230310T173000Z
DTEND:20230310T183000Z
UID:TALK172160@talks.cam.ac.uk
CONTACT:Janet Gibson
DESCRIPTION:Atoms in solids can be arranged in periodic patterns. A good t
 wo-dimensional analogy is wallpaper\, where a motif is repeated indefinite
 ly to generate a patterned roll of paper. Unlike the pictures on wallpaper
 \, the atomic patterns in metals are not frozen. They can be stimulated to
  change\, by deformation\, through the application of magnetic or electric
 al fields\, by the application of heat or during cooling to cryogenic temp
 eratures\, or during cataclysmic events.\n\nThese changes in atomic arrang
 ements can dramatically influence the properties of the metal\, sometimes 
 rendering it useless and at other times offering features that can improve
  the quality of life.\n\nRevealing the choreography of atoms during a stru
 ctural change by isolating the precise mechanism\, is therefore important 
 in the design of metallic materials. On occasions\, the movement is gracef
 ul with an orderly\, almost predictable collective motion that causes the 
 object to change its shape in a manner visible to the naked eye. The resul
 ting internal structure strengthens and toughens the metal. On the other h
 and\, there can be random movements which are more akin to chaotic dance. 
 Sometimes\, when there is a mixture of small and large atoms\, there can e
 xist both disciplined and disorderly trajectories of atoms.\n\nIn this tal
 k\, I will explain how we can isolate and study the dance of the atoms and
  illustrate how with this understanding\, we assume the role of a choreogr
 apher in creating some amazing materials.\n\nwww.phase-trans.msm.cam.ac.uk
 \n
LOCATION:Lady Mitchell Hall\, Sidgwick Avenue
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