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SUMMARY:Measurement of mechanical properties of diamond via solid particle
  erosion - Ben Ramsay\, SMF Group\, Cavendish Laboratory
DTSTART:20150521T150000Z
DTEND:20150521T153000Z
UID:TALK59225@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:Diamond is an established engineering material and displays a 
 range of exceptional mechanical properties\, depending on the particular c
 lass of sample [1\, 2].  If a complete understanding of the relationships 
 between extended and point defect structures in diamond and the subsequent
  macroscopic mechanical properties can be developed\, then it will enable 
 material properties such as hardness\, fracture strength and fracture toug
 hness to be engineered\, to optimise the material for particular applicati
 ons.  One of the first steps in the process is to determine relationships 
 between microscopic structural parameters and macroscopic material propert
 ies.\n\nMany standard mechanical characterisation tests are challenging to
  carry out on diamond.  For example\, indentation tests require diamond in
 denters\, themselves of unknown hardness\, and even then are likely to be 
 damaged after a relatively small number of measurements.  Hence\, developi
 ng alternative measurement methods is of considerable interest.  Here\, we
  describe an approach for determining the hardness\, H\, and fracture toug
 hness\, KIC\, of diamond from solid particle erosion\, by measurement of t
 he erosion rate.  Specifically\, for materials that undergo brittle fractu
 re\, the erosion rate\, ε\, has been shown to be proportional to E / H1/3
 K2IC [3\,4].  The method is used to study samples of CVD and HPHT diamond 
 samples and to examine the correlation between known defect classes and co
 ncentrations and material characteristics.\n\n[1] J. E. Field. Rep. Prog. 
 Phys.\, 75(12):126505\n[2] C. Yan. Phys. Status Solidi\, 201(4):R25-R27\n[
 3] F. Ericson. Mater. Sci. Eng. A\, 105-106:131-141\n[4] F. Ericson. Wear\
 , 115:107-120\n
LOCATION:Small Lecture Theatre\, Bragg Building\, Cavendish Laboratory
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