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Dislocation networks on ?/?

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Title: Dislocation networks on ?/?


1
Dislocation networks on ?/? interface in single
crystal Ni-base superalloys
AFOSR under MEANS 2
  • Ning Zhou Chen Shen Michael J. Mills Yunzhi
    Wang
  • The Ohio State University

2
Stress calculation for static network
  • Driving force for the formation of interfacial
    dislocation network misfit relieving and applied
    stress
  • Starting with different dislocation network
    configuration and density, explore the back
    stresses in the system and its relation with the
    lattice misfit and applied stress.
  • Calculate the elastic strain energy due to the
    dislocation networks, and relate dislocation
    density to the lattice misfit and applied stress.

3
Dislocation network configurations
(001) plane, ?/? interface
R. Field, T. Pollock, and W. Murphy, Superalloys,
pages 557566 (1992).
4
Dislocation configuration
Almost screw type
1280nm
010 dislocation pure edge type
extra half plane point to ?
5
?
?
?
Positive lattice misfit
extra half plane point to ? can relief misfit
stress
6
?
?
Misfit 0.3 with dislocations
Only misfit 0.3
only dislocations
7
Misfit 0.1
Average elastic energy density decrease from 0.25
to 0.20J/mol
Energy reduction by given dislocation networks
(J/mol)
Average elastic energy density increase from 2.22
to 3.04J/mol after adding dislocation network
misfit
Misfit 0.05 Average elastic energy density
increase from 0.062 to 0.12 J/mol
Misfit0.075 corresponds to the given network
configuration and density
8
Future work
  • Dislocation network dynamics by glide.
  • Relax certain network configurations under given
    applied stress and misfit and establish
    equilibrium network structure.
  • Determine the relation between misfit applied
    stress and dislocation configuration density.
  • Explore the possibility of incorporating climb
    mechanism into phase field dislocation dynamics.
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