Hoefnagels, JPM Johan

Vermeij, T

Vermeij, Tijmen

Hoefnagels, Johan P.M.

Pure OAI Repository

 Can we measure plastic strains at the nanoscale?Citation for published version (APA):Vermeij, T., & Hoefnagels, J. P. M. (2019). Can we measure plastic strains at the nanoscale?. Poster sessionpresented at Mate Poster Award 2019: 24th annual poster contest, Eindhoven, Netherlands.Document status and date:Published: 01/12/2019Document Version:Publisher’s PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can beimportant differences between the submitted version and the official published version of record. Peopleinterested in the research are advised to contact the author for the final version of the publication, or visit theDOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and pagenumbers.Link to publicationGeneral rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            • Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            • You may not further distribute the material or use it for any profit-making activity or commercial gain            • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license above, pleasefollow below link for the End User Agreement:www.tue.nl/taverneTake down policyIf you believe that this document breaches copyright please contact us at:openaccess@tue.nlproviding details and we will investigate your claim.Download date: 04. Oct. 2023Can we measure plastic strains at the nanoscale?DEPARTMENT OF MECHANICAL ENGINEERINGTijmen Vermeij* & Johan Hoefnagels*t.vermeij@tue.nlPlastic Slip in FerriteGOALS• Measure plastic strains in steel microstructures at high spatial resolution:• Retrieve strains over a large area (>50x50µm2)• Attain high spatial resolution at the nanoscale• Robustness to high strains• Allow direct comparison to the microstructure[1] J.P.M. Hoefnagels, M.v. Maris, T. Vermeij, One-step deposition of nano-to-micron-scalable, high-quality DIC patterns for high-strain in-situ multi-microscopy testing, Strain (2019)PROBLEM• Deformations in Advanced Steels at small scales are hard to measure and quantifyHOW?• High-Res Digital Image Correlation (DIC)• Apply a dense random pattern with nanoscale features [1]• Image pattern during deformation in the SEM• Attain high-resolution strain measurements at the nanoscale [1]• Retain robustness to high strains [1]• Align microstructure & strain fieldsPearliteFerriteCementite lamellaeFerriteFerrite grain boundaryStrain localization during deformation? Where? How much? Why?Apply pattern by InSn sputter coating [1]:• 50-100nm features (tuneable)• High density (tuneable)Perform DIC on in-situ tensile test in Scanning Electron MicroscopeRESULTS• High-Res plastic strainsMicrostructureMicrostructure with DIC patternFull microstructure 3% 10% 20%Evolving plastic strain fieldsFerriteCoarse PearliteStrain localization at Ferrite/Pearlite interfaceSmall plastic strains between Cementite LamellaeFurther localization between cementitelamellaeFailure of DIC patternStrong PearliteOverlay with microstructureSo, can we do it?• Yes! High spatial resolution for strains (~100 nm)• Good alignment with microstructure• Next: identify new mechanisms• Next: compare to simulationsUnprecedentedHigh Resolution <100nmIn-situ testingApply DIC on SEM images for strain calc.(with aligned Ferrite grain boundaries from EBSD)

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Can we measure plastic strains at the nanoscale?

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 Can we measure plastic strains at the nanoscale?Citation for published version (APA):Vermeij, T., & Hoefnagels, J. P. M. (2019). Can we measure plastic strains at the nanoscale?. Poster sessionpresented at Mate Poster Award 2019: 24th annual poster contest, Eindhoven, Netherlands.Document status and date:Published: 01/12/2019Document Version:Publisher’s PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can beimportant differences between the submitted version and the official published version of record. Peopleinterested in the research are advised to contact the author for the final version of the publication, or visit theDOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and pagenumbers.Link to publicationGeneral rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            • Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            • You may not further distribute the material or use it for any profit-making activity or commercial gain            • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license above, pleasefollow below link for the End User Agreement:www.tue.nl/taverneTake down policyIf you believe that this document breaches copyright please contact us at:openaccess@tue.nlproviding details and we will investigate your claim.Download date: 05. Oct. 2023Can we measure plastic strains at the nanoscale?DEPARTMENT OF MECHANICAL ENGINEERINGTijmen Vermeij* & Johan Hoefnagels*t.vermeij@tue.nlPlastic Slip in FerriteGOALS• Measure plastic strains in steel microstructures at high spatial resolution:• Retrieve strains over a large area (>50x50µm2)• Attain high spatial resolution at the nanoscale• Robustness to high strains• Allow direct comparison to the microstructure[1] J.P.M. Hoefnagels, M.v. Maris, T. Vermeij, One-step deposition of nano-to-micron-scalable, high-quality DIC patterns for high-strain in-situ multi-microscopy testing, Strain (2019)PROBLEM• Deformations in Advanced Steels at small scales are hard to measure and quantifyHOW?• High-Res Digital Image Correlation (DIC)• Apply a dense random pattern with nanoscale features [1]• Image pattern during deformation in the SEM• Attain high-resolution strain measurements at the nanoscale [1]• Retain robustness to high strains [1]• Align microstructure & strain fieldsPearliteFerriteCementite lamellaeFerriteFerrite grain boundaryStrain localization during deformation? Where? How much? Why?Apply pattern by InSn sputter coating [1]:• 50-100nm features (tuneable)• High density (tuneable)Perform DIC on in-situ tensile test in Scanning Electron MicroscopeRESULTS• High-Res plastic strainsMicrostructureMicrostructure with DIC patternFull microstructure 3% 10% 20%Evolving plastic strain fieldsFerriteCoarse PearliteStrain localization at Ferrite/Pearlite interfaceSmall plastic strains between Cementite LamellaeFurther localization between cementitelamellaeFailure of DIC patternStrong PearliteOverlay with microstructureSo, can we do it?• Yes! High spatial resolution for strains (~100 nm)• Good alignment with microstructure• Next: identify new mechanisms• Next: compare to simulationsUnprecedentedHigh Resolution <100nmIn-situ testingApply DIC on SEM images for strain calc.(with aligned Ferrite grain boundaries from EBSD)

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Can we measure plastic strains at the nanoscale?

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