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SUMMARY:Some Micromechanical Studies in Titanium - Dr. Angus Wilkinson\, D
 epartment of Materials\, University of Oxford
DTSTART:20110128T110000Z
DTEND:20110128T120000Z
UID:TALK29567@talks.cam.ac.uk
CONTACT:Dr Sandra Korte
DESCRIPTION:Over the past few years our work has focused on exploring fund
 amental deformation processes in Ti and its alloys. The work has two main 
 strands: (i) extraction of single crystal mechanical properties\, and (ii)
  characterising local stress and lattice rotation fields that develop duri
 ng deformation. We have developed methods to extract single crystal elasti
 c constants\, and critical resolved shear stresses from polycrystalline sa
 mples. FIB is used to machine micro-cantilevers and/or micro-pillars withi
 n individual selected grains offering suitable orientations\, and these ar
 e tested in bending or compression with a nanoindenter. For plastic deform
 ation significant size effects are evident but we are able to extrapolate 
 the data to bulk values. Data will be presented for Ti (α)\, Ti-6Al (α) 
 and Ti-6Al-4V (α+β)\, and comparison made between different slip systems
 . We have also been using the high resolution EBSD method\, developed in t
 he group\, to map local lattice rotations and elastic strain variations in
  deformed Ti alloys. The lattice curvatures (and elastic strain gradients)
  can be used to determine a lower bound estimate of the geometrically nece
 ssary dislocation density which allows the accumulation of dislocations wi
 thin a microstructure to be studied. The presentation ill include applicat
 ion of the method to studying indents in single grains of Ti\, the interac
 tion of slip bands and twins with grain boundaries\, and mapping of disloc
 ation content in Ti-6Al-4V polycrystals deformed by rolling\, tension and 
 fatigue. \n\n
LOCATION:Department of Materials Science\, Gordon Seminar Room
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