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Interstitial atoms enable joint twinning and transformation induced plasticity in strong and ductile high-entropy alloys

Scientific reports, 2017-01, Vol.7 (1), p.40704-40704, Article 40704 [Peer Reviewed Journal]

Copyright Nature Publishing Group Jan 2017 ;Copyright © 2017, The Author(s) 2017 The Author(s) ;ISSN: 2045-2322 ;EISSN: 2045-2322 ;DOI: 10.1038/srep40704 ;PMID: 28079175

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  • Title:
    Interstitial atoms enable joint twinning and transformation induced plasticity in strong and ductile high-entropy alloys
  • Author: Li, Zhiming ; Tasan, Cemal Cem ; Springer, Hauke ; Gault, Baptiste ; Raabe, Dierk
  • Subjects: Alloys ; Entropy ; Plasticity ; Tensile strength ; Transformation
  • Is Part Of: Scientific reports, 2017-01, Vol.7 (1), p.40704-40704, Article 40704
  • Description: High-entropy alloys (HEAs) consisting of multiple principle elements provide an avenue for realizing exceptional mechanical, physical and chemical properties. We report a novel strategy for designing a new class of HEAs incorporating the additional interstitial element carbon. This results in joint activation of twinning- and transformation-induced plasticity (TWIP and TRIP) by tuning the matrix phase's instability in a metastable TRIP-assisted dual-phase HEA. Besides TWIP and TRIP, such alloys benefit from massive substitutional and interstitial solid solution strengthening as well as from the composite effect associated with its dual-phase structure. Nanosize particle formation and grain size reduction are also utilized. The new interstitial TWIP-TRIP-HEA thus unifies all metallic strengthening mechanisms in one material, leading to twice the tensile strength compared to a single-phase HEA with similar composition, yet, at identical ductility.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2045-2322
    EISSN: 2045-2322
    DOI: 10.1038/srep40704
    PMID: 28079175
  • Source: PubMed Central
    ProQuest Central
    DOAJ Directory of Open Access Journals
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