Abstract
As a new form of plastic deformation, ultrasonic vibration-assisted deformation has recently attracted extensive attention, while its microstructure evolution and mechanical response remain unclear. In this paper, a gradient grain/twin structure of CrCoNi medium entropy alloy (MEA) was constructed by performing ultrasonic vibration surface friction treatment (UV-SFT) to improve its mechanical properties. Before and after plastic deformation, such a constructed microstructure was characterized by using an optical microscope, scanning electron microscope, electron backscattered diffraction, and transmission electron microscope, and thus both the microhardness and uniaxial tensile testing were performed. After the CrCoNi MEA has been experimentally treated with a UV-SFT process, not only does it exhibit a gradient grain/twin structure but the gradient deformation layer can also be divided into three parts: (1) the main features closest to the outer layer are nanocrystals and twins bent by deformation; (2) the severely plastic deformed layer leads to elongated lamellar grains and crossed multi-twinning systems; and (3) the transition layer mainly presents parallel twins and dislocation movements. Ultrasonic vibration surface plastic deformation significantly improves the yield strength and ultimate tensile strength of the CrCoNi MEA without loss of its plasticity, and shows excellent mechanical properties.
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Acknowledgements
The present work has been financially supported by the National Natural Science Foundation of China Project (Grant No.: 12102340), the Young Scientific Research and Innovation Team of the Xi'an Shiyou University (Grant No.: 2019QNKYCXTD14), the State Key Laboratory of Metastable Materials Science and Technology (Grant No.: 202111), the State Key Lab of Advanced Metals and Materials (Grant No.: 2021-Z06), the Opening project fund of Materials Service Safety Assessment Facilities (Grant No.: MSAF-2021-101), and the Postgraduate Innovation and Practical Ability Training Program of the Xi'an Shiyou University (Grant No.: YCS20212125). The authors also acknowledge a Discovery Grant and a Collaborative Research and Development (CRD) Grant from the Natural Sciences and Engineering Research Council (NSERC) of Canada to D. Yang.
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Wang, L., Hao, X., Su, Q. et al. Ultrasonic Vibration-Assisted Surface Plastic Deformation of a CrCoNi Medium Entropy Alloy: Microstructure Evolution and Mechanical Response. JOM 74, 4202–4214 (2022). https://doi.org/10.1007/s11837-022-05448-0
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DOI: https://doi.org/10.1007/s11837-022-05448-0