THE EFFECT OF THE THERMOMECHANICAL PROCESSING ON THE MICROSTRUCTURE AND HARDNESS OF (Co25Cr15Fe20Ni40)83Al17 HIGH ENTROPY ALLOY

Authors : Hüseyin Burak KOCABAŞ, Akın ÖZCAN, G İpek SELİMOĞLU, Hakan GAŞAN

Pages : 501-508

Doi:10.31796/ogummf.1128421

View : 18 | Download : 10

Publication Date : 2023-04-29

Article Type : Research Paper

Abstract :insert ignore into journalissuearticles values(Co25Cr15Fe20Ni40);83Al17 is a eutectic high entropy alloy insert ignore into journalissuearticles values(EHEA);, which is composed of face centered cubic insert ignore into journalissuearticles values(FCC); and body centered cubic insert ignore into journalissuearticles values(BCC); phases. This dual insert ignore into journalissuearticles values(FCC+BCC); phase mixture provides good ductility and strength combination. In the scope of this study, it was aimed to analyze the effect of mechanical, thermal and thermomechanical processes on the microstructure and hardness of insert ignore into journalissuearticles values(Co25Cr15Fe20Ni40);83Al17 EHEA, which was produced by the vacuum arc melting and casting method. With this aim, cold and hot rolling as well as different annealing treatments were applied to the as-cast plates. The cold-rolling was performed at room temperature while the hot rolling temperature was varied in between 500-1000℃. The maximum deformation that can be applied was 50% and 60 % after cold and hot rolling, respectively. The limited deformability was attributed to the increased BCC/B2 content in the eutectic phase mixture with the applied deformation. The hardness was increased from 280 HV to 412 HV after 50% cold-rolling. A similar high hardness value insert ignore into journalissuearticles values(399 HV); was obtained after ~50% deformation at 750℃, indicating that the dynamic recrystallization had no significant effect up to 1000℃.
Keywords : Ötektik Yüksek Entropili Alaşım, Vakum Ark Ergitme, Haddeleme, Tavlama