Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Plastic deformation modes in paramagnetic gamma-Fe from longitudinal spin fluctuation theory
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.ORCID iD: 0000-0001-9317-6205
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.ORCID iD: 0000-0001-7724-8299
Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, Pohang 37673, South Korea..
Show others and affiliations
2018 (English)In: International journal of plasticity, ISSN 0749-6419, E-ISSN 1879-2154, Vol. 109, p. 43-53Article in journal (Refereed) Published
Abstract [en]

Using an efficient first-principles computational scheme, we calculate the intrinsic stacking fault energy (gamma(isf) ) and the unstable stacking fault energy (gamma(usf)) of paramagnetic gamma-Fe as a function of temperature. The formation energies are derived from free energies accounting for thermal longitudinal spin fluctuations (LSFs). LSFs are demonstrated to be important for the accurate description of the temperature-dependent magnetism, intrinsic and unstable stacking fault energies, and have a comparatively large effect on gamma(isf) of gamma-Fe. Dominated by the magneto-volume coupling at thermal excitations, gamma(isf) of gamma-Fe exhibits a positive correlation with temperature, while gamma(usf )declines with increasing temperature. The predicted stacking fault energy of gamma-Fe is negative at static condition, crosses zero around 540 K, and reaches 71.0 mJ m(-2) at 1373 K, which is in good agreement with the experimental value. According to the plasticity theory formulated in terms of the intrinsic and unstable stacking fault energies, twinning remains a possible deformation mode even at elevated temperatures. Both the large positive temperature slope of gamma(usf) and the predicted high-temperature twinning are observed in the case of austenitic stainless steels.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2018. Vol. 109, p. 43-53
Keywords [en]
Spin fluctuations, Stacking-fault energy, Paramagnetism, gamma-Fe
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-238143DOI: 10.1016/j.ijplas.2018.05.007ISI: 000447111500003Scopus ID: 2-s2.0-85047919924OAI: oai:DiVA.org:kth-238143DiVA, id: diva2:1261629
Funder
Swedish Research Council, 2015-5335Swedish Research Council, 2017-06474Swedish Foundation for Strategic Research , S14-0038Swedish Foundation for Strategic Research , SM16-0036The Swedish Foundation for International Cooperation in Research and Higher Education (STINT), CH2015-6292Carl Tryggers foundation
Note

QC 20181108

Available from: 2018-11-08 Created: 2018-11-08 Last updated: 2020-01-30Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Dong, ZhihuaSchönecker, StephanLi, WeiVitos, Levente

Search in DiVA

By author/editor
Dong, ZhihuaSchönecker, StephanLi, WeiVitos, Levente
By organisation
Materials Science and EngineeringApplied Material Physics
In the same journal
International journal of plasticity
Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 18 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf