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

Title: 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.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344; ORISE-1120-1120-99

OSTI ID:: 1367989

Alternate ID(s):: OSTI ID: 1252034

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

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

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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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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