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The synergistic addition of Al, Ti, Mo and W to strengthen the equimolar CoCrFeNi high-entropy alloy via thermal-mechanical processing.

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Title:	The synergistic addition of Al, Ti, Mo and W to strengthen the equimolar CoCrFeNi high-entropy alloy via thermal-mechanical processing.
Authors:	Man, Jiale¹ (AUTHOR), Wu, Baolin^1,2 (AUTHOR) wubaolin@sau.edu.cn, Duan, Guosheng² (AUTHOR), Zhang, Lu² (AUTHOR), Wan, Gang² (AUTHOR), Zhang, Li² (AUTHOR), Zou, Naifu² (AUTHOR), Liu, Yandong¹ (AUTHOR)
Source:	Journal of Alloys & Compounds. May2022, Vol. 902, pN.PAG-N.PAG. 1p.
Subjects:	Solution strengthening, Tungsten alloys, Tensile strength, Alloys, Crystal grain boundaries
Abstract:	• σ-TCP precipitates are favorable for improving the tensile property of equimolar CoCrFeNi-HEA. • nano γ′ phase is positive strengthening medium for equimolar CoCrFeNi-HEA. • W, Mo, Al and Ti play a synergistic role in strengthening the equimolar CoCrFeNi-HEA. • A promising combination of yield strength and elongation can be obtained via thermal-mechanical processing. The tensile mechanical properties and microstructures of the (CoCrFeNi) (100−x) (WMo) x and (CoCrFeNi) (100−x −6) (WMo) x (Al Ti) 6 (x = 1, 3, and 5) HEAs were investigated in the present work. The results showed that in addition to solid solution strengthening, grain boundary strengthening and dislocation strengthening, the equimolar CoCrFeNi-HEA doped with W and Mo was effectively strengthened by the precipitation of submicron topological close-packed phase (TCP) σ via thermal-mechanical processing. When Al (3 at%) and Ti (3 at%) added based on W and Mo additions, the alloys were further strengthened due to the formation of a heterogeneous microstructure containing the submicron σ phase, nano γ′ phase and micron (Ti, W, Mo)-rich phase. Tensile yield and ultimate strengths of the thermal-mechanical processed (CoCrFeNi) 91 (WMo) 3 (AlTi) 6 and (CoCrFeNi) 93 (WMo) 1 (AlTi) 6 HEAs can reach to 1576 MPa and 1216 MPa, respectively, combined with the correspondent elongations of 4.0% and 10.7%, respectively. The synergistic addition of W, Mo, Al and Ti is effective for improving the mechanical property of the equimolar CoCrFeNi-HEA. Ti easily causes the formation of (Ti, W, Mo)-rich phase that plays a role in enhancing the alloy. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	• σ-TCP precipitates are favorable for improving the tensile property of equimolar CoCrFeNi-HEA. • nano γ′ phase is positive strengthening medium for equimolar CoCrFeNi-HEA. • W, Mo, Al and Ti play a synergistic role in strengthening the equimolar CoCrFeNi-HEA. • A promising combination of yield strength and elongation can be obtained via thermal-mechanical processing. The tensile mechanical properties and microstructures of the (CoCrFeNi) (100−x) (WMo) x and (CoCrFeNi) (100−x −6) (WMo) x (Al Ti) 6 (x = 1, 3, and 5) HEAs were investigated in the present work. The results showed that in addition to solid solution strengthening, grain boundary strengthening and dislocation strengthening, the equimolar CoCrFeNi-HEA doped with W and Mo was effectively strengthened by the precipitation of submicron topological close-packed phase (TCP) σ via thermal-mechanical processing. When Al (3 at%) and Ti (3 at%) added based on W and Mo additions, the alloys were further strengthened due to the formation of a heterogeneous microstructure containing the submicron σ phase, nano γ′ phase and micron (Ti, W, Mo)-rich phase. Tensile yield and ultimate strengths of the thermal-mechanical processed (CoCrFeNi) 91 (WMo) 3 (AlTi) 6 and (CoCrFeNi) 93 (WMo) 1 (AlTi) 6 HEAs can reach to 1576 MPa and 1216 MPa, respectively, combined with the correspondent elongations of 4.0% and 10.7%, respectively. The synergistic addition of W, Mo, Al and Ti is effective for improving the mechanical property of the equimolar CoCrFeNi-HEA. Ti easily causes the formation of (Ti, W, Mo)-rich phase that plays a role in enhancing the alloy. [ABSTRACT FROM AUTHOR]
ISSN:	09258388
DOI:	10.1016/j.jallcom.2022.163774