Affiliation:
1. School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, China
Abstract
The effects of thermo-mechanical treatment on the mechanical properties and corrosion resistance behaviour of the (FeCoNiCr)92Ti3.5Al4.5 (at.-%) high-entropy alloy (HEA) were studied. Compared with the untreated specimen, the yield and ultimate tensile strength increased by 227.5% and 129.4% after thermo-mechanical treatment, with ductility remaining almost constant. The results indicated that the grain size refined from 233.44 to 2.31 μm, and the dislocation density considerably increased from 2.69 × 1012 to 1.23 × 1014. Notably, after thermo-mechanical treatment, the formation of precipitates can narrow the passivation zone, thus increasing the tendency of pitting corrosion. The corrosion current decreased and the radius of the impedance curve increased, indicating the corrosion resistance behaviour improved, which was attributed to the grain refinement.
Funder
Key Research Project of the Higher Education Institutions of Henan Province
Special Research and Promotion Project of Henan Province
the National Science Foundation of China