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ARTICLE
Discrete Dislocation Dynamics Simulation of Interfacial Dislocation Network in Gamma/Gamma-Prime Microstructure of Ni-based Superalloys
K. Yashiro1, Y. Nakashima1, Y. Tomita1
1
Kobe Univ., 1-1, Rokkodai, Nada Kobe JAPAN.
Computer Modeling in Engineering & Sciences 2006, 11(2), 73-80. https://doi.org/10.3970/cmes.2006.011.073
Abstract
A simple back force model is proposed for
a dislocation cutting into γ' precipitate, taking the work
formaking and recovering an anti-phase boundary (APB)
into account. The first dislocation, or a leading partial of
a superdislocation, is acted upon by a back force whose
magnitude is equal to the APB energy. The second dislocation,
or a trailing partial of a superdislocation, is attracted
by the APB with a force of the same magnitude.
The model is encoded in the 3D discrete dislocation dynamics
(DDD) code and applied to the cutting behavior
of dislocations at a γ/γ' interface covered by an interfacial
dislocation network. Dislocations are generated from
Frank-Read sources and approach the interface. The first
dislocation piles up at the interface not by the stress field
of the network but by the back force against making an
APB. The second dislocation, however, stands off from
the interface by the stress field of the first dislocation and
the dislocation network. The finer mesh of the network,
the further the second dislocation piles up. These two
dislocations cut into the precipitate forming a superdislocation
under the force from follow-on dislocations. It
is also clarified that the penetration takes place from the
interspace of the network.
Keywords
Cite This Article
Yashiro, K., Nakashima, Y., Tomita, Y. (2006). Discrete Dislocation Dynamics Simulation of Interfacial Dislocation Network in Gamma/Gamma-Prime Microstructure of Ni-based Superalloys.
CMES-Computer Modeling in Engineering & Sciences, 11(2), 73–80.