Heterostructuring an equiatomic CoNiFe medium-entropy alloy for enhanced yield strength and ductility synergy | |
Ding, Xin-Xin1,2; Wang J(王晶)2![]() ![]() ![]() ![]() ![]() | |
Source Publication | RARE METALS
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2022-05-22 | |
Pages | 12 |
ISSN | 1001-0521 |
Abstract | High-/medium-entropy alloys (H/MEAs) of face-centered-cubic-structured single phase usually suffer from a glaring drawback of low yield strength. Even worse, the trade-off emerges frustratingly between strength and ductility as strength increases. Here, the lamellar heterostructure (HS) is designed in an equiatomic ternary CoNiFe MEA by means of cold rolling followed by an incomplete recrystallization annealing. The lamellar HS consists of the soft recrystallized grains as well as severely deformed structures which are partly reserved. By comparison to the coarse-grained counterpart, the lamellar HS, shows a well enhanced yield strength-ductility synergy, together with an increased yield strength. This is ascribed to the hetero-deformation-induced (HDI) stress in HS during tensile deformation. Accordingly, the HDI strain hardening is induced, serving as an important addition to the conventional forest hardening. The HDI hardening is evidenced experimentally to account for a large proportion of global strain hardening. Furthermore, a fully recrystallized microstructure is obtained to show a simultaneous increase in both yield strength and ductility. The microstructures are evaluated in detail prior to and after tensile deformation by using the electron backscattered diffraction and transmission electron microscope observations. The mechanism for HDI strain hardening in various microstructures is analyzed to correlate to the evolution of microstructures in terms of the kernel average misorientation values, Schmid factor, and dislocation behaviors in response to plastic deformation. |
Keyword | Heterostructure (HS) Medium-entropy alloy (MEA) Hetero-deformation Ductility Strength |
DOI | 10.1007/s12598-022-01986-3 |
Indexed By | SCI ; EI |
Language | 英语 |
WOS ID | WOS:000799676100001 |
WOS Keyword | MECHANICAL-PROPERTIES ; SOLID-SOLUTION ; GRADIENT ; PLASTICITY ; SIZE |
WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
Funding Project | National Key R&D Program of China[2017YFA0204402] ; National Key R&D Program of China[2019YFA0209900] ; National Natural Science Foundation of China[11972350] ; National Natural Science Foundation of China[11790293] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040503] |
Funding Organization | National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences |
Classification | 一类 |
Ranking | 1 |
Contributor | Liu, Guang-Hua |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/89439 |
Collection | 非线性力学国家重点实验室 |
Affiliation | 1.Tiangong Univ, Sch Phys Sci & Technol, Tianjin 300387, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 4.Cent Iron & Steel Res Inst, Special Steel Dept, Beijing 100081, Peoples R China |
Recommended Citation GB/T 7714 | Ding, Xin-Xin,Wang J,Liu D,et al. Heterostructuring an equiatomic CoNiFe medium-entropy alloy for enhanced yield strength and ductility synergy[J]. RARE METALS,2022:12. |
APA | Ding, Xin-Xin.,Wang J.,Liu D.,Wang, Chang.,Jiang P.,...&Wu XL.(2022).Heterostructuring an equiatomic CoNiFe medium-entropy alloy for enhanced yield strength and ductility synergy.RARE METALS,12. |
MLA | Ding, Xin-Xin,et al."Heterostructuring an equiatomic CoNiFe medium-entropy alloy for enhanced yield strength and ductility synergy".RARE METALS (2022):12. |
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