Dislocation dynamics in a nickel-based superalloy via in-situ transmission scanning electron microscopy

J. C. Stinville; Eric R. Yao; Patrick G. Callahan; Jungho Shin; Fulin Wang; McLean P. Echlin; Tresa M. Pollock; Daniel S. Gianola

doi:10.1016/j.actamat.2018.12.061

Dislocation dynamics in a nickel-based superalloy via in-situ transmission scanning electron microscopy

J. C. Stinville, Eric R. Yao, Patrick G. Callahan, Jungho Shin, Fulin Wang, McLean P. Echlin, Tresa M. Pollock, Daniel S. Gianola

Research output: Contribution to journal › Article › peer-review

Abstract

Micro-tensile specimens of nickel-based superalloy oligocrystals were tested in-situ in an scanning electron microscope in transmission mode (TSEM) enabling observation of dislocations. The dynamics of dislocation motion during tensile loading were captured and correlated with the measured intermittencies during plastic flow recorded by high load- and temporal-resolution sensors. This investigation in particular focused on the dislocation behavior near twin boundaries with different slip configurations. A multiplicity of deformation mechanisms at the dislocation scale were observed within individual slip bands, including precipitate shearing, dislocation decorrelation and antiphase boundary-coupled shearing. These processes affect strain localization near twin boundaries and provide new defect-level insights on plastic localization and fatigue crack initiation in these alloys.

Original language	English (US)
Pages (from-to)	152-166
Number of pages	15
Journal	Acta Materialia
Volume	168
DOIs	https://doi.org/10.1016/j.actamat.2018.12.061
State	Published - Apr 15 2019
Externally published	Yes

Keywords

Dislocations dynamic
In-situ transmission scanning electron microscopy (TSEM)
Nickel-based superalloy rené 88DT
Plastic localization
STEM detector
Twin boundary

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

Online availability

10.1016/j.actamat.2018.12.061

Library availability

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@article{c66cb22ff8d04b12874a200516322dda,

title = "Dislocation dynamics in a nickel-based superalloy via in-situ transmission scanning electron microscopy",

abstract = "Micro-tensile specimens of nickel-based superalloy oligocrystals were tested in-situ in an scanning electron microscope in transmission mode (TSEM) enabling observation of dislocations. The dynamics of dislocation motion during tensile loading were captured and correlated with the measured intermittencies during plastic flow recorded by high load- and temporal-resolution sensors. This investigation in particular focused on the dislocation behavior near twin boundaries with different slip configurations. A multiplicity of deformation mechanisms at the dislocation scale were observed within individual slip bands, including precipitate shearing, dislocation decorrelation and antiphase boundary-coupled shearing. These processes affect strain localization near twin boundaries and provide new defect-level insights on plastic localization and fatigue crack initiation in these alloys.",

keywords = "Dislocations dynamic, In-situ transmission scanning electron microscopy (TSEM), Nickel-based superalloy ren{\'e} 88DT, Plastic localization, STEM detector, Twin boundary",

author = "Stinville, {J. C.} and Yao, {Eric R.} and Callahan, {Patrick G.} and Jungho Shin and Fulin Wang and Echlin, {McLean P.} and Pollock, {Tresa M.} and Gianola, {Daniel S.}",

note = "Funding Information: The research reported here was supported by the NSF MRSEC Program through DMR 1720256 (IRG-1). The authors gratefully acknowledge additional support of GE Global Research. T.M. Pollock acknowledges the support of a Vannevar Bush Fellowship, grant N00014-18-1-3031. The research reported here made use of shared facilities of the UCSB MRSEC (NSF DMR 1720256), a member of the Materials Research Facilities Network (www.mrfn.org). Funding Information: The research reported here was supported by the NSF MRSEC Program through DMR 1720256 (IRG-1). The authors gratefully acknowledge additional support of GE Global Research . T.M. Pollock acknowledges the support of a Vannevar Bush Fellowship , grant N00014-18-1-3031 . The research reported here made use of shared facilities of the UCSB MRSEC ( NSF DMR 1720256 ), a member of the Materials Research Facilities Network ( www.mrfn.org ). Publisher Copyright: {\textcopyright} 2019 Acta Materialia Inc.",

year = "2019",

month = apr,

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doi = "10.1016/j.actamat.2018.12.061",

language = "English (US)",

volume = "168",

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AU - Stinville, J. C.

AU - Yao, Eric R.

AU - Callahan, Patrick G.

AU - Shin, Jungho

AU - Wang, Fulin

AU - Echlin, McLean P.

AU - Pollock, Tresa M.

AU - Gianola, Daniel S.

N1 - Funding Information: The research reported here was supported by the NSF MRSEC Program through DMR 1720256 (IRG-1). The authors gratefully acknowledge additional support of GE Global Research. T.M. Pollock acknowledges the support of a Vannevar Bush Fellowship, grant N00014-18-1-3031. The research reported here made use of shared facilities of the UCSB MRSEC (NSF DMR 1720256), a member of the Materials Research Facilities Network (www.mrfn.org). Funding Information: The research reported here was supported by the NSF MRSEC Program through DMR 1720256 (IRG-1). The authors gratefully acknowledge additional support of GE Global Research . T.M. Pollock acknowledges the support of a Vannevar Bush Fellowship , grant N00014-18-1-3031 . The research reported here made use of shared facilities of the UCSB MRSEC ( NSF DMR 1720256 ), a member of the Materials Research Facilities Network ( www.mrfn.org ). Publisher Copyright: © 2019 Acta Materialia Inc.

PY - 2019/4/15

Y1 - 2019/4/15

N2 - Micro-tensile specimens of nickel-based superalloy oligocrystals were tested in-situ in an scanning electron microscope in transmission mode (TSEM) enabling observation of dislocations. The dynamics of dislocation motion during tensile loading were captured and correlated with the measured intermittencies during plastic flow recorded by high load- and temporal-resolution sensors. This investigation in particular focused on the dislocation behavior near twin boundaries with different slip configurations. A multiplicity of deformation mechanisms at the dislocation scale were observed within individual slip bands, including precipitate shearing, dislocation decorrelation and antiphase boundary-coupled shearing. These processes affect strain localization near twin boundaries and provide new defect-level insights on plastic localization and fatigue crack initiation in these alloys.

AB - Micro-tensile specimens of nickel-based superalloy oligocrystals were tested in-situ in an scanning electron microscope in transmission mode (TSEM) enabling observation of dislocations. The dynamics of dislocation motion during tensile loading were captured and correlated with the measured intermittencies during plastic flow recorded by high load- and temporal-resolution sensors. This investigation in particular focused on the dislocation behavior near twin boundaries with different slip configurations. A multiplicity of deformation mechanisms at the dislocation scale were observed within individual slip bands, including precipitate shearing, dislocation decorrelation and antiphase boundary-coupled shearing. These processes affect strain localization near twin boundaries and provide new defect-level insights on plastic localization and fatigue crack initiation in these alloys.

KW - Dislocations dynamic

KW - In-situ transmission scanning electron microscopy (TSEM)

KW - Nickel-based superalloy rené 88DT

KW - Plastic localization

KW - STEM detector

KW - Twin boundary

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JO - Acta Materialia

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Dislocation dynamics in a nickel-based superalloy via in-situ transmission scanning electron microscopy

Abstract

Keywords

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