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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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Affiliation:

1.School of Materials Science and Engineering,Shenyang Aerospace University;2.Department of Materials Science and Engineering,City University of Hong Kong

Clc Number:

TG139

Fund Project:

Special topic on military-civilian Integration of key R & D programs in Liaoning Province (Project No. 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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[Yan Fei, Du Xinghao, Jin Chengyan, Shi Chuanxin, Gai Yehui, Li Wanpeng, Tzu Hsiu Chou, 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.]
DOI:10.12442/j. issn.1002-185X.20211041

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History
  • Received:November 26,2021
  • Revised:February 09,2022
  • Adopted:March 02,2022
  • Online: February 13,2023
  • Published: February 08,2023