Surface Modification of CrFeCoNiMo High Entropy Alloy Induced by High-current Pulsed Electron Beam
This work was supported by National Natural Science Foundation of China (No. 51601071), the Postdoctoral Foundation of Jiangsu Province (No. 2018K025B), the Youth Talent Development Program of Jiangsu University, Postgraduate Innovation Programs Foundation of Jiangsu Province (No. KYCX18-2236), Key University Science Research Project of Jiangsu Province (16KJB430009) and Senior Talent Foundation of Jiangsu University (15JDG078).
Applied Surface Science
The surface of non-equiatomic CrFeCoNiMo high entropy alloy (HEA) was irradiated by high-current pulsed electron beam (HCPEB). Microstructure, mechanical properties and corrosion resistance of the CrFeCoNiMo HEA before and after HCPEB irradiation were studied systematically. The results of XRD analysis indicated that the surface of the irradiated samples exhibited preferential orientation on (1 1 1) and (2 0 0). Microstructure observations revealed that a compact remelted layer was formed on the surface of the alloy after HCPEB irradiation, the thickness of the remelted layer rose as the increase of pulse numbers. Besides, numerous nano σ particles, nanocrystallites with an average size about 109 nm and abundant deformed structures also appeared in the remelted layer. The mechanical properties of CrFeCoNiMo alloy were significantly enhanced after HCPEB treatment, which was mainly ascribed to intense plastic deformation via stress, sub-grain strengthening along with precipitation hardening. Electrochemical results demonstrated that all the irradiated specimens had a positive potential and a lower current density in 3.5 wt% NaCl solution compared with the untreated sample. The homogenized surface and the efficient eliminating of the local concentration of Cr element jointly contributed to the improvement of corrosion resistance.
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Lyu, P., Chen, Y., Liu, Z., Cai, J., Zhang, C., Jin, Y., ... & Zhao, N. (2020). Surface modification of CrFeCoNiMo high entropy alloy induced by high-current pulsed electron beam. Applied Surface Science, 504, 144453.