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

Li, Juan; Pharr, G. M.; Kirchlechner, C.

doi:10.1557/s43578-021-00253-y

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

Journal Article · Fri Jun 04 00:00:00 EDT 2021 · Journal of Materials Research

DOI:https://doi.org/10.1557/s43578-021-00253-y· OSTI ID:1863549

^[1]; Pharr, G. M. ^[2]; Kirchlechner, C. ^[3]

Max-Planck-Inst. Für Eisenforschung GmbH, Düsseldorf (Germany); Karlsruhe Inst. of Technology, Eggenstein-Leopoldshafen (Germany); Texas A&M University
Texas A & M Univ., College Station, TX (United States)
Max-Planck-Inst. Für Eisenforschung GmbH, Düsseldorf (Germany); Karlsruhe Inst. of Technology, Eggenstein-Leopoldshafen (Germany)

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.

View Accepted Manuscript (DOE)

Research Organization:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003857

OSTI ID:: 1863549

Alternate ID(s):: OSTI ID: 1850379

Journal Information:: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 10 Vol. 36; ISSN 0884-2914

Publisher:: Materials Research SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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