Dislocation Multi-junctions and Strain Hardening

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At the microscopic scale, the strength of a crystal derives from the motion, multiplication and interaction of distinctive line defects--dislocations. First theorized in 1934 to explain low magnitudes of crystal strength observed experimentally, the existence of dislocations was confirmed only two decades later. Much of the research in dislocation physics has since focused on dislocation interactions and their role in strain hardening: a common phenomenon in which continued deformation increases a crystal's strength. The existing theory relates strain hardening to pair-wise dislocation reactions in which two intersecting dislocations form junctions tying dislocations together. Here we report that interactions among three ... continued below

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Bulatov, V; Hsiung, L; Tang, M; Arsenlis, A; Bartelt, M; Cai, W et al. June 20, 2006.

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At the microscopic scale, the strength of a crystal derives from the motion, multiplication and interaction of distinctive line defects--dislocations. First theorized in 1934 to explain low magnitudes of crystal strength observed experimentally, the existence of dislocations was confirmed only two decades later. Much of the research in dislocation physics has since focused on dislocation interactions and their role in strain hardening: a common phenomenon in which continued deformation increases a crystal's strength. The existing theory relates strain hardening to pair-wise dislocation reactions in which two intersecting dislocations form junctions tying dislocations together. Here we report that interactions among three dislocations result in the formation of unusual elements of dislocation network topology, termed hereafter multi-junctions. The existence of multi-junctions is first predicted by Dislocation Dynamics (DD) and atomistic simulations and then confirmed by the transmission electron microscopy (TEM) experiments in single crystal molybdenum. In large-scale Dislocation Dynamics simulations, multi-junctions present very strong, nearly indestructible, obstacles to dislocation motion and furnish new sources for dislocation multiplication thereby playing an essential role in the evolution of dislocation microstructure and strength of deforming crystals. Simulation analyses conclude that multi-junctions are responsible for the strong orientation dependence of strain hardening in BCC crystals.

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PDF-file: 21 pages; size: 0 Kbytes

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  • Journal Name: Nature, vol. 440, n/a, April 27, 2006, pp. 1174-1178; Journal Volume: 440

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  • Report No.: UCRL-JRNL-222317
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 895419
  • Archival Resource Key: ark:/67531/metadc884385

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 20, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 23, 2016, 4:05 p.m.

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Bulatov, V; Hsiung, L; Tang, M; Arsenlis, A; Bartelt, M; Cai, W et al. Dislocation Multi-junctions and Strain Hardening, article, June 20, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc884385/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.