Binary dislocation junction formation and strength in hexagonal close-packed crystals

Wu, Chi -Chin; Aubry, Sylvie; Arsenlis, Athanasios; Chung, Peter C.

doi:10.1016/j.ijplas.2015.12.003

Binary dislocation junction formation and strength in hexagonal close-packed crystals

Journal Article · Thu Dec 17 00:00:00 EST 2015 · International Journal of Plasticity

DOI:https://doi.org/10.1016/j.ijplas.2015.12.003· OSTI ID:1367989

Wu, Chi -Chin ^[1]; Aubry, Sylvie ^[2]; Arsenlis, Athanasios ^[2]; Chung, Peter C. ^[3]

U.S. Army Research Lab., Aberdeen Proving Ground, MD (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Maryland, College Park, MD (United States); U.S. Army Research Lab., Adelphi, MD (United States)

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 (011¯0) prismatic plane and a second dislocation on one of the following planes: (0001) basal, (11¯00) prismatic, (11¯01) primary pyramidal, or (2¯112) secondary pyramidal. Varying pairs of Burgers vectors are chosen from among the common types the basal type < a > 1/3 < 112¯0 >, prismatic type < c > <0001>, and pyramidal type < a+c > 1/3 < 112¯3¯ >. 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. Lastly, the results provide analytical insights on binary dislocation interactions that may occur in general hcp metals.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1367989

Alternate ID(s):: OSTI ID: 1252034

Report Number(s):: LLNL-JRNL--702744; PII: S0749641915002028

Journal Information:: International Journal of Plasticity, Journal Name: International Journal of Plasticity Vol. 79; ISSN 0749-6419

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Nanoscale imaging of the full strain tensor of specific dislocations extracted from a bulk sample Hofmann, Felix; Phillips, Nicholas W.; Das, Suchandrima Physical Review Materials, Vol. 4, Issue 1 https://doi.org/10.1103/physrevmaterials.4.013801	journal	January 2020
Influence of hydrogen core force shielding on dislocation junctions in iron Yu, Haiyang; Katzarov, Ivaylo H.; Paxton, Anthony T. Physical Review Materials, Vol. 4, Issue 3 https://doi.org/10.1103/physrevmaterials.4.033607	journal	March 2020
Nano-scale imaging of the full strain tensor of specific dislocations extracted from a bulk sample Hofmann, Felix; Phillips, Nicholas W.; Das, Suchandrima arXiv https://doi.org/10.48550/arxiv.1903.04079	text	January 2019

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