| [Yan Fei,Du Xinghao,Jin Chengyan,Shi Chuanxin,Gai Yehui,Li Wanpeng,Tzu Hsiu Chou and Huang Chih-Ching.High-temperature Srengthening and Toughening Behavior and the Associated Deformation Mechanism of CoCrNi-based Medium Entropy Alloy with Rich Co and Cr Content[J].Rare Metal Materials and Engineering,2023,52(1):179~185.] |
| High-temperature Srengthening and Toughening Behavior and the Associated Deformation Mechanism of CoCrNi-based Medium Entropy Alloy with Rich Co and Cr Content |
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| Received:November 26, 2021 Revised:February 09, 2022 |
| DOI： |
| Key words: CoCrNiAlTi medium entropy alloy Strengthening phase High-temperature mechanical properties Deformation mechanisms |
| Foundation item:辽宁省重点研发计划军民融合专题(项目号JH2/10700006) |
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| Abstract: |
| In this paper, the high temperature mechanical properties and the associated deformation mechanism of CoCrNi-based entropy alloy with rich-CoCr content were studied. It is found that the alloy with the compostions of Co33.3Cr30.6Ni26.1Al5Ti5 (at. %) exhibited excellent instantaneous tensile properties in the temperature range of 600℃ to 800℃ after hot forging and aging heat treatment. In particular, the yield strength anomaly occurs at 700℃, the tensile yield strength is as high as 944 MPa and the elongation at break is 16%, which is better than most nickel-base and nickel-cobalt-base superalloys. By means of X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and three-dimensional atomic probe (3D-APT), it is found that the strong ordered strengthening of high-volume fraction multi-principal γ" [(Ni, Co, Cr)3(Al, Ti)] phase combined with grain boundary strengthening aring from the formation of FCC phase with rich-CoCr is the main factor for the excellent high temperature properties of the alloy. |
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