|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High Entropy Alloys IV
||Elastic to Plastic Transition in a High Entropy Alloy Investigated Using a Nanoindentation Method
||T.G. Nieh, Dong Wu
|On-Site Speaker (Planned)
In this study, we employed instrumented indentation technique to study the elastic/plastic transition in a face-centered cubic (fcc) high-entropy alloy NiFeCoCrMn. Ni single crystal was also examined for comparison. Tests were carried out using indenters with different tip radii to study the effect of indented volume on deformation processes. Indentation pop-ins generally occurred in both NiFeCoCrMn and Ni. When the tip radius increased, the critical shear stress decreased. We proposed a statistical model to successfully describe the pop-in behavior of the materials under different tip radii. In the plastic region, the hardness of NiFeCoCrMn was greatly enhanced, presumably resulted from a large lattice distortion in the alloy. The response of both NiFeCoCrMn and Ni at large indentation depth could be described satisfactorily by Nix-Gao model. Pop-in lengths were also analyzed. The variation of mean pressure underneath the indenter tip during and after the first pop-in was discussed.
||Planned: A print-only volume