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  Quantitative insights into the dislocation source behavior of twin boundaries suggest a new dislocation source mechanism

Li, J., Pharr, G. M., & Kirchlechner, C. (2021). Quantitative insights into the dislocation source behavior of twin boundaries suggest a new dislocation source mechanism. Journal of Materials Research, 36(10), 2037-2046. doi:10.1557/s43578-021-00253-y.

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Quantitative insights into the dislocation source behavior of twin boundaries suggest a new dislocation source mechanism - Li2021_Article_QuantitativeInsightsIntoTheDis.pdf (Publisher version), 3MB
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Quantitative insights into the dislocation source behavior of twin boundaries suggest a new dislocation source mechanism - Li2021_Article_QuantitativeInsightsIntoTheDis.pdf
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 Creators:
Li, Juan1, Author              
Pharr, George M.2, Author              
Kirchlechner, Christoph1, 3, Author              
Affiliations:
1Nano-/ Micromechanics of Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863401              
2Texas A&M University, College Station, TX, 77843, USA, ou_persistent22              
3Institute for Applied Materials (IAM-WBM), Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen D-76344, Germany, ou_persistent22              

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Free keywords: Copper alloys, Bulk single crystals; Collective formations; Dislocation densities; Dislocation emissions; Partial dislocations; Shockley partial dislocations; Spherical indenters; Stacking fault energies, High resolution transmission electron microscopy
 Abstract: Pop-in statistics from nanoindentation with spherical indenters are used to determine the stress required to activate dislocation sources in twin boundaries (TBs) in copper and its alloys. The TB source activation stress is smaller than that needed for bulk single crystals, irrespective of the indenter size, dislocation density and stacking fault energy. Because an array of pre-existing Frank partial dislocations is present at a TB, we propose that dislocation emission from the TB occurs by the Frank partials splitting into Shockley partials moving along the TB plane and perfect lattice dislocations, both of which are mobile. The proposed mechanism is supported by recent high resolution transmission electron microscopy images in deformed nanotwinned (NT) metals and may help to explain some of the superior properties of nanotwinned metals (e.g. high strength and good ductility), as well as the process of detwinning by the collective formation and motion of Shockley partial dislocations along TBs. Graphic abstract: [Figure not available: see fulltext.] © 2021, The Author(s).

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 Dates: 2021-06-04
 Publication Status: Published in print
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 Identifiers: DOI: 10.1557/s43578-021-00253-y
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Title: Journal of Materials Research
  Abbreviation : J. Mater. Res.
Source Genre: Journal
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Publ. Info: Pittsburgh, PA : Published for the Materials Research Society by the American Institute of Physics
Pages: - Volume / Issue: 36 (10) Sequence Number: - Start / End Page: 2037 - 2046 Identifier: ISSN: 0884-2914
CoNE: https://pure.mpg.de/cone/journals/resource/954925550339