|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Carbon and Nitrogen Co-doping in an Equiatomic High-entropy Alloy
||Zhiming Li, Dierk Raabe
|On-Site Speaker (Planned)
Most studies on high-entropy alloys (HEAs) set off mainly to tune the substitutional elements in the single- or multi-phase matrix, yet, the resultant mechanical properties are often not substantially improved compared to traditional low-entropy alloys such as high-strength steels or Ti alloys. Here, we present how we further enhance the mechanical properties of an equiatomic CoCrFeMnNi HEA via the co-doping of interstitial carbon and nitrogen into the single face-centered cubic structure. Thermo-mechanical processing was also employed to refine the matrix grains as well as trigger precipitation of nano-sized carbides and nitrides. The approach enables the synthesis of alloys that show a combination of multiple mechanisms such as significant interstitial solid solution strengthening and twinning-induced plasticity upon deformation. Owing to the multiple strain hardening mechanisms that are jointly active, the tensile strength of the carbon and nitrogen co-doped HEA is more than twice the corresponding value for the undoped equiatomic HEA.
||Planned: Supplemental Proceedings volume