Journal Article

Effects of trace secondary elements on microstructure and properties in CoCrMnFeNiX0.1 alloys

Guo, Meng, Tang, Lingling, Wang, Nan, Zhou, Yang

2023

Overview

This study synthesized four kinds of CoCrMnFeNiX 0.1 (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 CoCrMnFeNiTi 0.1 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 CoCrMnFeNiX 0.1 alloy; post-tensile fracture morphology and corrosion morphology of the as-aged CoCrMnFeNiTi 0.1 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.

• Publisher: Springer International Publishing,Springer Nature B.V
• Subject: Aging / Aging (metallurgy) / Alloying effects / Alloys / Aluminum / Applied and Technical Physics / Biomaterials / Chemistry and Materials Science / Copper / Corrosion prevention / Corrosion resistance / Ductility / Elongation / Heat treatment / High entropy alloys / High temperature / Homogenization / Inorganic Chemistry / Materials Engineering / Materials Science / Mechanical properties / Microstructure / Molybdenum / Morphology / Nanotechnology / Solid solutions / Stress-strain curves / Tensile properties / Titanium / True stress / Ultimate tensile strength / Wear resistance