Details

Autor(en) / Beteiligte

• Guo, Lin
• Ou, Xiaoqin
• Ni, Song
• Liu, Yong
• Song, Min

Titel

Effects of carbon on the microstructures and mechanical properties of FeCoCrNiMn high entropy alloys

Ist Teil von

• Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2019-02, Vol.746, p.356-362

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• FeCoCrNiMn based high entropy alloys (HEAs) doped with different carbon contents were prepared by vacuum arc melting. The effects of carbon on phase composition and mechanical properties of the HEAs were investigated. After cold rolling and annealing processes, fine M23C6 carbides with an average size of ~230 nm were observed in the HEAs doped with carbon. The volume fraction of M23C6 reaches 8.9% in the alloy doped with 1.0 at% carbon. The precipitation of M23C6 particles exerts a strong pinning force for the migration of grain boundary, which results in the formation of refined grains. Compared to those of the HEA without carbon, the yield strength and ultimate tensile strength of the HEA doped with 1.0 at% carbon increase from 378.7 MPa to 643.8 MPa, and from 700.1 MPa to 887.6 MPa, respectively, while the uniform elongation decreases from 43.5% to 24.9%. The strengthening mechanisms for the increase in the mechanical properties by carbon doping are attributed to the refinement of the grains, lattice friction stress and the precipitation of the M23C6 particles.