Effects of Ti addition and annealing on microstructure and mechanical properties of CoCrFeMnNi high-entropy alloy
Journal
Journal of Materials Science
Journal Volume
59
Journal Issue
23
Start Page
10526
End Page
10540
ISSN
0022-2461
1573-4803
Date Issued
2024-06
Author(s)
Pei-Yu Chen
DOI
10.1007/s10853-024-09790-3
Abstract
High-entropy alloys (HEAs) with a face-centered cubic (FCC) structure have recently received significant attention due to their outstanding ductility and fracture toughness. In this study, the effects of Ti addition and annealing on the microstructures and mechanical properties of CoCrFeMnNi HEAs were investigated. Two CoCrFeMnNiTix (x = 0 and 0.2, named Ti-0 and Ti-0.2) HEAs were prepared by arc melting, followed by homogenization, cold rolling and annealing at 800 °C and 900 °C, respectively, for 1 h. The microstructure evolution, crystallographic texture and mechanical properties were studied. It was found that the Ti-0 alloy exhibited a single-phase FCC solid solution, while Cr-rich σ phase and (Ni, Co)3Ti η phase precipitated in the Ti-0.2 alloy after annealing. With the precipitation of the hard yet brittle σ and η phases, the yield strength and hardness of Ti-0.2 alloy increased significantly but with the sacrifice in the tensile elongation. The contributions of intrinsic strength, solid solution, grain size and precipitation strengthenings to the tensile yield strength were calculated and compared with measurements. Both grain boundary strengthening and precipitation strengthening were the main strengthening mechanisms for the Ti-doped CoCrFeMnNi HEAs. Graphical abstract: (Figure presented.)
Publisher
Springer Science and Business Media LLC
Type
journal article