Microstructure and mechanical properties of CoCrNi-Mo medium entropy alloys:Experiments and first-principle calculations
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第3期
论文作者：Ruobin Chang Wei Fang Jiaohui Yan Haoyang Yu Xi Bai Jia Li Shiying Wang Shijian Zheng Fuxing Yin
文章页码：25 - 33
摘 要：The effect of Mo additions on the microstructures and mechanical properties of CoCrNi alloys was investigated,meanwhile,ab initio calculations are performed to quantitatively evaluate the lattice distortion and stacking fault energy（SFE）.The yield strength,ultimate tensile strength,and elongation of（CoCrNi）97Mo3 alloy are 475 MPa,983 MPa and 69 %,respectively.The yield strength is increased by ～30% and high ductility is maintained,in comparison with CoCrNi alloy.Besides the nano-twins and dislocations,the higher density of stacking faults is induced during the tensile deformation for（CoCrNi）97Mo3 alloy.Ab initio calculation results indicate the mean square atomic displacement（MSAD） and SFE value of（CoCrNi）97Mo3 alloy is 42.6 pm2 and -40.4 mJ/m2 at 0 K,respectively.The relationship between mechanical properties and MSAD,SFE for various multiple principal element alloys is discussed.
Ruobin Chang1,2，Wei Fang1,2，Jiaohui Yan2，Haoyang Yu2，Xi Bai2，Jia Li3，Shiying Wang4，Shijian Zheng1,2，Fuxing Yin1,2
1. Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology2. Research Institute for Energy Equipment Materials, School of Materials Science and Engineering, Hebei University of Technology3. School of Science, Hebei University of Technology4. School of Materials Science and Engineering, Changzhou University
摘 要：The effect of Mo additions on the microstructures and mechanical properties of CoCrNi alloys was investigated,meanwhile,ab initio calculations are performed to quantitatively evaluate the lattice distortion and stacking fault energy（SFE）.The yield strength,ultimate tensile strength,and elongation of（CoCrNi）97Mo3 alloy are 475 MPa,983 MPa and 69 %,respectively.The yield strength is increased by ～30% and high ductility is maintained,in comparison with CoCrNi alloy.Besides the nano-twins and dislocations,the higher density of stacking faults is induced during the tensile deformation for（CoCrNi）97Mo3 alloy.Ab initio calculation results indicate the mean square atomic displacement（MSAD） and SFE value of（CoCrNi）97Mo3 alloy is 42.6 pm2 and -40.4 mJ/m2 at 0 K,respectively.The relationship between mechanical properties and MSAD,SFE for various multiple principal element alloys is discussed.
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