|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Effects of cerium addition and post-annealing on microstructures and mechanical properties of CoCrNi medium entropy alloy films
||Yi-Ting Lin, Chun-Hway Hsueh
|On-Site Speaker (Planned)
In this work, the effects of rare-earth element Ce addition on the microstructures and mechanical properties of (CoCrNi)100-xCex (x=0, 1.05, 2.61, 4.2, 5.96) medium entropy alloy films are investigated. The structure transforms from FCC to FCC+HCP at x=2.61. Also, as Ni precipitates with Ce to form CeNi5 HCP phase, the localized depletion of Ni would encourage CoCrNi to transform from FCC to HCP phase. With the further increase in Ce content, Ce4.2 film becomes mixed nanocrystalline and amorphous structures and Ce5.96 film is fully amorphous. Both the hardness and compressive strength show an initial increase, reach the maxima at x=1.05, and then decrease with the increasing Ce content. The strengthening mechanisms will be discussed. Also, the Ce4.2 films are subsequently annealed at different temperatures, and the crystallinity increases with the increasing annealing temperature. The evolution of the structures and mechanical properties with the annealing temperature will be discussed.
||High-Entropy Alloys, Mechanical Properties, Thin Films and Interfaces