Excellent combination of cryogenic-temperature strength and ductility of high-entropy-alloy-cored multi-layered sheet

We newly design a high-entropy-alloy(HEA)-cored multi-layered sheet (MLS) containing AISI 304 stainless steel (STS) surface layers (HEA/STS MLS) by using a commercial roll-bonding procedure, and property-enhancing mechanisms such as TWinning Induced Plasticity (TWIP), TRansformation Induced Plastici...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-08, Vol.797, p.465-470
Main Authors: Song, H., Yang, J., Jo, Y.H., Song, T., Kim, H.S., Lee, B.-J., Lee, S.
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Bonding strength
Cryogenic engineering
Cryogenic temperature
Deformation mechanisms
Dislocations
Elongation
Geometrically necessary dislocation (GND)
High entropy alloys
High-entropy alloy (HEA)
Multi-layered sheet (MLS)
Multilayers
Plastic properties
Roll bonding
Strain hardening
Surface layers
TRansformation induced plasticity (TRIP)
Trip generation
Twinning
TWinning induced plasticity (TWIP)
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Summary:We newly design a high-entropy-alloy(HEA)-cored multi-layered sheet (MLS) containing AISI 304 stainless steel (STS) surface layers (HEA/STS MLS) by using a commercial roll-bonding procedure, and property-enhancing mechanisms such as TWinning Induced Plasticity (TWIP), TRansformation Induced Plasticity (TRIP), and geometrically necessary dislocation (GND) generation were analyzed. This MLS well satisfied a rule of mixtures because the HEA and STS layers were strongly bonded to show similar deformation mechanisms of TWIP and TRIP at both room and cryogenic temperatures. The HEA layer demonstrated synergic effects of homogenization and maximization of TWIP and TRIP mechanisms with the STS layers. In particular, very high strain hardening and persistent elongation (about 50%) as well as very high tensile strength over 1.5 GPa are quite unique and interesting results because they have not been reported in the FCC-based HEA areas yet. Our findings also demonstrate that the HEA-cored MLS fabrication can be an attractive route to a new HEA design strategy for cryogenic applications. [Display omitted] •MLS can be successfully fabricated by roll-bonding of an HEA sheet with STS sheets.•MLS has high tensile strength and persistent elongation with high strain hardening.•The active TWIP and TRIP in interfacial regions improve tensile properties.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.05.088