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- W4200500577 abstract "The weldability and effects of subsequent heat treatment on the microstructure and mechanical properties of the medium-entropy alloy (MEA) (NiCoCr)94Al3Ti3 have been explored using electron beam welding (EBW). It was found that EBW joints consist of a supersaturated f.c.c. matrix with coarse, asymmetric columnar grains (17.7–24 μm). The fraction of twins and Σ3n CSL boundaries in weld joints was only 10% of that in the base metal, a value which increased to 30% after aging at 800 °C. The aging also led to improvements in the hardness, tensile strength, and work hardening rate, a result of the precipitation of a high volume fraction (0.29–0.33) of ultrafine (15–17.4 nm dia.) coherent spherical L12-structured particles. The contributions of the L12 nanoparticles and Hall-Petch strengthening to the yield strength were estimated to be 537–573 MPa and 105–123 MPa, respectively. The MEA shows excellent weldability and, after aging, good strength (YS∼1098 MPa, UTS∼1368 MPa) and elongation to failure (∼11%) by ductile fracture." @default.
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- W4200500577 date "2022-02-01" @default.
- W4200500577 modified "2023-10-17" @default.
- W4200500577 title "Optimization of the microstructure and mechanical properties of electron beam welded high-strength medium-entropy alloy (NiCoCr)94Al3Ti3" @default.
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- W4200500577 doi "https://doi.org/10.1016/j.intermet.2021.107439" @default.
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