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SUMMARY:Hydrogen uptake and diffusion – implications for evaluating resi
 stance to hydrogen embrittlement - Dr Alan Turnbull\, National Physical La
 boratory
DTSTART:20141114T140000Z
DTEND:20141114T150000Z
UID:TALK54798@talks.cam.ac.uk
CONTACT:Ms Helen Gardner
DESCRIPTION:The methodologies for measuring and modelling hydrogen uptake 
 and diffusion in metals are now quite advanced with atomistic modelling in
 creasingly adding to our physical insight and underpinning the more common
 ly applied continuum models. Despite such progress\, best practice and rig
 our are not always adhered to in too many applications and this impacts on
  the reliability of test data. Furthermore\, data from diffusivity measure
 ments are often employed in engineering applications or in predictive mode
 ls of cracking in an inappropriate way. An overview will be presented of t
 he varied factors affecting hydrogen uptake and diffusion\, perceptions on
  hydrogen recombination poisons\, the concept of reversible and irreversib
 le microstructural traps\, and the challenges in integrating the kinetics 
 of hydrogen entry\, transport and the micromechanisms of cracking to predi
 ct threshold and crack growth kinetics.
LOCATION:Oatley Seminar Room\, Department of Engineering
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