Deformation mechanisms of Mo alloyed FeCoCrNi high entropy alloy: In situ neutron diffraction
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
A FeCoCrNiMo0.23 high entropy alloy was processed by powder metallurgy with two conditions: hot extruded and annealed. In situ neutron diffraction, together with electron microscopy, was used to study the deformation mechanisms and concomitant microstructural evolution for both conditions. The as-extruded alloy has a single face-centered-cubic structure with a calculated stacking fault energy of ∼19 mJ/m2. When the alloy is tensile deformed, nano-twins and microbands are induced, resulting in an excellent combination of strength and ductility (784 MPa ultimate tensile strength and over 50% elongation). Annealing at 800 °C for 72 h increases the strength of the alloy but decreases its ductility. This is due to the decomposition of the alloy after annealing, causing the formation of Mo-rich intermetallic particles and a decrease of the stacking fault probability. These results highlight that combined mechanisms (i.e. solute strengthening and twin/microband induced plasticity) can effectively improve both the strength and ductility of high entropy alloys.
Date Issued
2017-04-01
Date Acceptance
2017-01-19
Citation
Acta Materialia, 2017, 127, pp.471-480
ISSN
1359-6454
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Start Page
471
End Page
480
Journal / Book Title
Acta Materialia
Volume
127
Copyright Statement
Crown Copyright © 2017 Published by Elsevier Ltd on behalf of Acta Materialia Inc. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000397362600046&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
High entropy alloy
Neutron diffraction
Twin induced plasticity
Lattice strains
Stacking faults
INDUCED PLASTICITY STEEL
STACKING-FAULT ENERGY
X-RAY-DIFFRACTION
AL-C STEEL
TENSILE DEFORMATION
TWIP STEEL
DISLOCATION SUBSTRUCTURE
AUSTENITIC STEELS
DAMAGE-TOLERANCE
MICROSTRUCTURE
Publication Status
Published
Date Publish Online
2017-01-27