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Aging behavior of a CuCr2Fe2NiMn high-entropy alloy
Graphical abstract Aging temperature has a significant effect on the microstructure of the CuCr2Fe2NiMn high-entropy alloy. As the temperature increased from 600 to 800°C, the morphology of precipitates changes from rod-like to round particles with a size of 1–2μm. These precipitates are identified as the ρ phase rich in Cr, Fe and Mn elements according to the EDS, which results in the age hardening. When the aging temperature increased to 1100°C, the interdendrites are composed of (Cr,Fe,Ni)-rich FCC2 with a morphology of bulky strip or fine needle-like, which is responsible for the softening anneal at high temperature. Display Omitted Highlights ► CuCr2Fe2NiMn alloy exhibits a good high-temperature age hardening phenomenon. ► A peak hardness of Hv 450 at 800°C was obtained due to the forming of ρ phase. ► Decomposition of ρ phase resulted in softening anneal at 1100°C of aging. ► Good thermal stability gives it a potential for application in high temperature materials.
Abstract The effect of aging treatment on the hardness and microstructure of a CuCr2Fe2NiMn high-entropy alloy is investigated. The results show that the alloy exhibits a good high-temperature age hardening phenomenon and temper resistance. The aged alloy can obtain a peak hardness of 450 HV at 800°C. Softening anneal occurs at 1100°C. Age hardening is mainly attributed to the precipitation hardening of the ρ phase and a more homogeneous microstructure, whereas the softening of the aged alloy may be related to the decomposition of the ρ phase and Cu-rich FCC1 and to the coarsening of the FCC2 phase in the interdendrite regions.
Aging behavior of a CuCr2Fe2NiMn high-entropy alloy
Graphical abstract Aging temperature has a significant effect on the microstructure of the CuCr2Fe2NiMn high-entropy alloy. As the temperature increased from 600 to 800°C, the morphology of precipitates changes from rod-like to round particles with a size of 1–2μm. These precipitates are identified as the ρ phase rich in Cr, Fe and Mn elements according to the EDS, which results in the age hardening. When the aging temperature increased to 1100°C, the interdendrites are composed of (Cr,Fe,Ni)-rich FCC2 with a morphology of bulky strip or fine needle-like, which is responsible for the softening anneal at high temperature. Display Omitted Highlights ► CuCr2Fe2NiMn alloy exhibits a good high-temperature age hardening phenomenon. ► A peak hardness of Hv 450 at 800°C was obtained due to the forming of ρ phase. ► Decomposition of ρ phase resulted in softening anneal at 1100°C of aging. ► Good thermal stability gives it a potential for application in high temperature materials.
Abstract The effect of aging treatment on the hardness and microstructure of a CuCr2Fe2NiMn high-entropy alloy is investigated. The results show that the alloy exhibits a good high-temperature age hardening phenomenon and temper resistance. The aged alloy can obtain a peak hardness of 450 HV at 800°C. Softening anneal occurs at 1100°C. Age hardening is mainly attributed to the precipitation hardening of the ρ phase and a more homogeneous microstructure, whereas the softening of the aged alloy may be related to the decomposition of the ρ phase and Cu-rich FCC1 and to the coarsening of the FCC2 phase in the interdendrite regions.
Aging behavior of a CuCr2Fe2NiMn high-entropy alloy
Ren, B. (author) / Liu, Z.X. (author) / Cai, B. (author) / Wang, M.X. (author) / Shi, L. (author)
2011-07-03
6 pages
Article (Journal)
Electronic Resource
English
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