Overcoming plasticity reduction in a severely deformed nano-grained metastable alloy


Generally, most bulk metallic materials reveal an increased strength but a loss of ductility after cold deformation, referred as the strength–ductility trade-off. This phenomenon is moderately less in some metastable alloys, which exhibit a transformation-induced plasticity (TRIP), i.e., a martensitic transformation from FCC phase to BCC phase. However, most of them show outstanding mechanical properties induced by TRIP effect only at cryogenic conditions. In this study, we present a strategy to overcome this problem by introducing a high density of crystalline defects into a Fe-based metastable alloy by refining grains to a nanometer scale. This procedure significantly improves the kinetics and reduces the driving force for TRIP. As a result, the TRIP effect originally occurring at cryogenic temperature in the Fe-based metastable alloy, is also active at ambient conditions, contributing to a strength-ductility synergy and overcoming cold working induced sacrifice of ductility.

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DOI https://doi.org/10.35097/1937
Metadata Access https://www.radar-service.eu/oai/OAIHandler?verb=GetRecord&metadataPrefix=datacite&identifier=10.35097/1937
Creator Lu, Yemao ORCID logo; Zhu, Gaoming; Ivanisenko, Y.; Hahn, H.
Publisher Karlsruhe Institute of Technology
Contributor RADAR
Publication Year 2024
Rights Open Access; Creative Commons Attribution 4.0 International; info:eu-repo/semantics/openAccess; https://creativecommons.org/licenses/by/4.0/legalcode
OpenAccess true
Resource Type Dataset
Format application/x-tar
Discipline Construction Engineering and Architecture; Engineering; Engineering Sciences