|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Alloy design, microstructure analysis, mechanical testing and weldability of a novel CoCuFeMnNi-based high entropy alloy
||jacopo fiocchi, Carlo Alberto Biffi, Mauro Coduri, Ali Mostaed, Luca Patriarca, Maurizio Vedani, Ausonio Tuissi, Riccardo Casati
|On-Site Speaker (Planned)
High entropy alloys are a novel class of metallic materials, which open unpreceded room for the design of new alloys. Herein, equiatomic CoCuFeMnNi alloy was modified through the addition of alloying elements to favour the precipitation of strengthening second phases during ageing treatment. The alloy was designed with a mechanistic approach aided by CALPHAD simulations. The alloy was then cast, cold rolled and eventually subjected to heat treatments. Microstructural analysis was performed by synchrotron X-ray diffraction and transmission electron microscopy. It revealed a microstructure consisting of FCC grains free of second phases after solution treatment. Ageing led to the spinodal decomposition of the solid solution and different types of coherent precipitates. Fracture toughness and tensile behaviour of the alloys were investigated at room and cryogenic temperatures. Laser processing of thin sheets was finally performed to evaluate the alloy weldability and the effect of the high cooling rates on microstructure.
||High-Entropy Alloys, Phase Transformations, Joining