Abstract
This study synthesized four kinds of CoCrMnFeNiX0.1 (X = Al, Cu, Mo, Ti) high-entropy alloys to investigate the alloying effect. We found the strengthening effect after aging thermal treatment can be sequenced as Ti > Mo > Cu > Al, of which the tensile strength was improved by 20 ~ 40% and the elongation to failure preserved (~ 50%) compared with the corresponding casting materials. Specifically, the CoCrMnFeNiTi0.1 alloy offered a yield strength of 435 MPa, an ultimate tensile strength of 900 MPa, and a fracture elongation of 40% is significantly higher than those of their conventional counterparts. Furthermore, the anti-corrosion ability of added secondary elements is in the following order: Ti > Mo > Al > Cu. Through microstructure observations, we discussed and analyzed the formation and evolution of second-phase particles, which play an important role due to the strong interactive effect among different elements. In general, adding a secondary trace Ti or Mo element improves strength and anti-corrosion properties.
Graphical abstract
Enhanced tensile properties are shown in true stress–strain curves of the as-cast and as-aged CoCrMnFeNiX0.1 alloy; post-tensile fracture morphology and corrosion morphology of the as-aged CoCrMnFeNiTi0.1 alloy compare with the as-cast CoCrMnFeNi alloy, indicating that adding trace secondary Ti element benefits the outstanding improvement of strength and anti-corrosion properties.
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Acknowledgments
The authors would like to acknowledge the financial support of the National Natural Science Foundation of China (NO. 51801072, NO. 51805219), and China Postdoctoral Science Foundation (2019TQ0126).
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The financial support was provided by the National Natural Science Foundation of China (NO. 51801072, NO. 51805219), and China Postdoctoral Science Foundation (2019TQ0126).
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Tang, L., Guo, M., Zhou, Y. et al. Effects of trace secondary elements on microstructure and properties in CoCrMnFeNiX0.1 alloys. Journal of Materials Research 38, 3110–3123 (2023). https://doi.org/10.1557/s43578-023-01031-8
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DOI: https://doi.org/10.1557/s43578-023-01031-8