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Friction stir welding of a сarbon-doped CoCrFeNiMn high-entropy alloy

2018; Elsevier BV; Volume: 145; Linguagem: Inglês

10.1016/j.matchar.2018.08.063

1873-4189

D.G. Shaysultanov, Nikita Stepanov, Sergey Malopheyev, Igor Vysotskiy, В. Н. Санин, S. Mironov, Rustam Kaibyshev, G.A. Salishchev, Sergey Zherebtsov,

Additive Manufacturing Materials and Processes

Butt-joint seam of a high entropy alloy (HEA) of the CoCrFeNiMn system was successfully obtained by friction stir welding (FSW). The HEA was produced by self-propagating high-temperature synthesis. Along with the principal elements, a small amount (0.9 at.%) of C was added to the alloy. The as-cast alloy was cold rolled and annealed at 900 °C to produce refined microstructure. The structure of the annealed alloy consisted of a recrystallized face-centered cubic matrix with a grain size of 9.2 μm and fine Cr-rich M 23 C 6 carbides . FSW of the HEA resulted in microstructure refinement to d = 4.6 μm in the stir zone. A noticeable rise in strength and some decrease in ductility of the processed alloy in comparison with the initial condition can be associated with the microstructure refinement and some increase in the volume fraction of M 23 C 6 carbides. • Friction stir welding of a CoCrFeNiMn HEA doped with C was successfully obtained. • M 23 C 6 carbides with d≈150 nm form in the HEA due to addition of 0.9 at.% C. • Friction stir welding resulted in a decrease in grain size from 9.2 μm to 4.6 μm. • Smaller grain size and increased fraction of M 23 C 6 increase strength by 84 MPa.