NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
53rd NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
Session ID : 1C1
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OS12-1
Molecular Dynamics / Discrete Dislocation Dynamics Study on Dislocation Behavior in Ni-Based Superalloys
*Kisaragi YashiroYasushi TabataFumiharu KuroseYoshihiro TomitaHussein M. Zbib
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Abstract
In the present study, dislocation behaviors in the gamma/gamma-prime microstructure of Ni-based superalloys are investigated by means of molecular dynamics (MD) and discrete dislocation (DD) dynamics simulations. MD results show that a dislocation is not pinned at the gamma/gamma-prime interface but with the stress field around the gamma-prime precipitates. A DDD--FEM analysis is then implemented to evaluate the stress field correctly and treat the image force on dislocations from surfaces and precipitates. The result shows that a dislocation is decelerated and piled at the inteface of the matrix/precipitate with the stress field.
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© 2004 Committee for Mechanics and Structure,Science Council
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