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• W4225705502 endingPage "143072" @default.
• W4225705502 startingPage "143072" @default.
• W4225705502 abstract "A series of TiNbMo0.5AlX (x = 0.125, 0.15, 0.175, 0.2, 0.225, 0.25) refractory medium entropy alloys with low density (6.82–7.01 g/cm3) was developed in this work, which should synchronously meet the requirement of mechanical properties at both ambient and high temperature conditions. We found excess Al-addition was conducive to the formation of precipitates with FCC structure; with increasing Al content, the microstructure of alloys evolved from single BCC phase (Al0.125) to BCC matrix + FCC-Ti dual-phase characteristics. Meanwhile, most of these alloys exhibited typical dendrite morphology, except for equiaxed Al0.225. Controlled by elastic strain energy, the precipitates were mainly distributed in interdendrite as clusters of flake-like. All developed alloys presented excellent comprehensive mechanical properties, such as 1022 MPa yield strength and 31% fracture strain could be realized in room-temperature. Al0.225, which also retained 710 MPa strength and 39% strain at 800 °C. The dislocation-dominated deformation mechanism plays an important role in achieving excellent properties. The dislocation pile-up effectively increases compressive strength, and the magnificent compressive ductility is attributed to the dislocation-slip mechanism. The typical Kurdjumov-Sachs (K–S) coherent relationship between BCC matrix and FCC-Ti was investigated, which effectively possessed a significant enhancement in the strength-ductility synergy. In addition, no apparent softening was observed in the stress-strain curves, which made it possible for the alloy to work stably at 800 °C. This work opens new perspectives for the design and application of RMEAs with high strength-ductility synergy." @default.
• W4225705502 created "2022-05-05" @default.
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• W4225705502 date "2022-06-01" @default.
• W4225705502 modified "2023-10-14" @default.
• W4225705502 title "Strength-ductility synergy of Al-bearing low-density refractory TiNbMo0.5AlX medium entropy alloys via precipitation" @default.
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• W4225705502 doi "https://doi.org/10.1016/j.msea.2022.143072" @default.
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