Journal
ADVANCED ENGINEERING MATERIALS
Volume 22, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.201900477
Keywords
deformation twinning; high-pressure torsion; microstructures; shear strains; steels
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Funding
- National Natural Science Foundation of China [51601094]
- Fundamental Research Funds for the Central Universities [30918011342, 30919011412]
- National Science Foundation of the United States [DMR-1810343]
- European Research Council (ERC) [267464-SPDMETALS]
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A ductile duplex stainless steel consisting of a ferrite phase and an austenitic phase is chosen as a model material to investigate the development of shear strain patterns under high-pressure torsion. Systematic analysis on the macroscopic and microscopic heterogeneities of local shear strain reveals that complex shear patterns can be developed only above a high strain level where the grain sizes are already refined to a steady state. It is concluded that grain boundary-mediated deformation mechanisms provide sufficient freedom for reshaping the austenite phase domains, and thus the intrinsic factor required for the formation of these complicated shear patterns is well-developed ultrafine grains and/or nanograins.
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