The hot deformation behavior of a L12 precipitation strengthened face centered cubic high entropy alloy

• Published in: Materials today communications 2025-01, Vol.42, p.111133, Article 111133
• Main Authors: Liang, S.Y., Tian, Q.W., Ouyang, D.H., Song, J.X., Wu, S.S., Wang, M., Zhang, P.F., Xie, L.F., Feng, J.K., Chen, Z., Zhong, X.T., Liu, R.Y., Cheng, X.W.
• Format: Article
• Language: English
• Subjects: Dynamic recrystallization; High-entropy alloys; Hot processing map
• ISSN: 2352-4928; 2352-4928
• DOI: 10.1016/j.mtcomm.2024.111133

In this work, the hot compressive deformation behavior of a homogenized Ni45Co15Cr15Fe15Al8Ti2 high entropy alloy was investigated at deformation temperatures of 900–1200°C and strain rates of 10−3-1 s−1. Initially, combined the true stress-strain curves and hyperbolic sine function model, the constitutive equation for the flow stress of the alloy during the hot deformation process was established. Additionally, the hot processing map of the alloy at a true strain of ε = 0.5 was plotted based on the DMM model. Coupled with microstructural observations, the optimal hot processing parameters for the alloy were determined to be T = 1070–1200 °C and ε̇= 0.001–0.05 s−1. Finally, the deformed microstructure of the alloy under different temperatures and strain rates was characterized using EBSD, and the dynamic recrystallization mechanisms was revealed. The flow stress decreases with the increasing deformation temperature and decreasing strain rate. As the deformation temperature increases from 900°C to 1200°C, the dynamic recrystallization mechanism transitions from continuous dynamic recrystallization (CDRX) to discontinuous dynamic recrystallization (DDRX). The findings of this study will provide valuable guidance for the development of hot forging parameters of the L12 strengthened FCC high-entropy alloys. [Display omitted] •The hot deformation behavior of a L12 precipitaion strengthened FCC high entropy alloys were firstly investigated.•The optimal hot processing parameters were determined by the hot processing map and microstructure characterization.•The dynamic recrystallization mechanisms under various deformation conditions were revealed.