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Dislocation Dynamics Simulations of Junctions in Hexagonal Close-Packed Crystals

Conference ·
DOI:https://doi.org/10.1557/opl.2012.234· OSTI ID:1034137
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The formation and strength of dislocations in the hexagonal closed packed material beryllium are studied through dislocation junctions and the critical stress required to break them. Dislocation dynamics calculations (using the code ParaDiS) of junction maps are compared to an analytical line tension approximation in order to validate our model. Results show that the two models agree very well. Also the critical shear stress necessary to break 30{sup o} - 30{sup o} and 30{sup o} - 90{sup o} dislocation junctions is computed numerically. Yield surfaces are mapped out for these junctions to describe their stability regions as function of resolved shear stresses on the glide planes. The example of two non-coplanar binary dislocation junctions with slip planes [2-1-10] (01-10) and [-12-10] (0001) corresponding to a prismatic and basal slip respectively is chosen to verify and validate our implementation.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Organization:
USDOE
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
1034137
Report Number(s):
LLNL-PROC-520234
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
APPROXIMATIONS
BERYLLIUM
DISLOCATIONS
IMPLEMENTATION
SHEAR
SLIP
STABILITY
STRESSES