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Binary dislocation junction formation and strength in hexagonal close-packed crystals
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DOI：10.1016/j.ijplas.2015.12.003.png)
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Abstract
En 中文
This work examines binary dislocation interactions, junction formation and junction strengths in hexagonal close-packed (hcp) crystals. Through a line-tension model and dislocation dynamics (DD) simulations, the interaction and dissociation of different sets of binary junctions are investigated involving one dislocation on the (01 (1) over bar0) prismatic plane and a second dislocation on one of the following planes: (0001) basal, (1 (1) over bar 00) prismatic, (1 (1) over bar 01) primary pyramidal, or ((2) over bar 112) secondary pyramidal. Varying pairs of Burgers vectors are chosen from among the common types: the basal type : 1/3 <11<(2)over bar>0 >, prismatic type :<0001>, and pyramidal type : 1/3 <11<(23)over bar> >. For binary interaction due to dislocation intersection, both the analytical results and DD-simulations indicate a relationship between symmetry of interaction maps and the relative magnitude of the Burgers vectors that constitute the junction. Using analytical formulae, a simple regressive model is also developed to represent the junction yield surface. The equation is treated as a degenerated super elliptical equation to quantify the aspect ratio and tilting angle. The results provide analytical insights on binary dislocation interactions that may occur in general hcp metals. (c) 2015 Elsevier Ltd. All rights reserved.
Keywords:
Dislocations
Dynamics
Elastic material
Analytic functions
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