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Multiple deformation scheme in direct energy deposited CoCrNi medium entropy alloy at 210K

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Alternative Title
Multiple deformation scheme in direct energy deposited CoCrNi medium entropy alloy at 210K
Abstract
CoCrNi medium entropy alloy (MEA) and stainless steel 316L (SS316L) were manufactured by direct energy
deposition of additive manufacturing (DED-AM). Exceptional mechanical properties of DED CoCrNi at 210K were
achieved by the activities of a multiple deformation scheme that changed from dislocation slip to twinninginduced
plasticity followed by transformation-induced plasticity. While SS316L at room temperature has
micro-twins, CoCrNi at 210K exhibited nano-twins, resulting from lower stacking fault energy. Moreover,
transformed hexagonal close-packed (HCP) phases were found near the face-centered cubic (FCC) {111} grain
boundaries, where remarkable stacking faults and severe lattice distortion were measured. The formation of HCP
substructure was understood from stacking fault probability, mean square strain, and lower temperature, which
increased the strain hardening rate of several orientations in the FCC matrix, finally improving the strength of
CoCrNi at 210K. A combination of CoCrNi MEA and DED-AM achieves a synergistic effect of strength, ductility
and toughness for low temperature applications.
Author(s)
김동규김유섭우완측이동현이수열채호병Stefanus HarjoTakuro Kawasaki
Issued Date
2021
Type
Article
Keyword
Additive manufacturingMedium entropy alloyMultiple deformation schemeIn-situ neutron diffractionPeak profile analysis
DOI
10.1016/j.msea.2021.142059
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8887
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_gale_infotracacademiconefile_A679870695&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Multiple%20deformation%20scheme%20in%20direct%20energy%20deposited%20CoCrNi%20medium%20entropy%20alloy%20at%20210K&offset=0&pcAvailability=true
Publisher
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Location
스위스
Language
영어
ISSN
0921-5093
Citation Volume
828
Citation Number
1
Citation Start Page
142059
Citation End Page
142059
Appears in Collections:
Engineering > Mechanical and Automotive Engineering
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