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