Microstructure and mechanical properties of CoCrNi-Mo medium entropy alloys: Experiments and first-principle calculations. (30th January 2021)

• Record Type: Journal Article
• Authors: Chang, Ruobin; Fang, Wei; Yan, Jiaohui; Yu, Haoyang; Bai, Xi; Li, Jia; Wang, Shiying; Zheng, Shijian; Yin, Fuxing
• Is Part Of: Journal of materials science & technology. Volume 62(2021)
• Page Start: 25
• Page End: 33
• Publication Date: 2021-01-30
• Subjects: Medium entropy alloys -- Severe lattice distortion -- Stacking fault energy -- Single phase -- Mechanical properties -- Ab initio calculations -- High entropy alloys; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2020.04.062
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: 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)97 Mo3 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)97 Mo3 alloy. Ab initio calculation results indicate the mean square atomic displacement (MSAD) and SFE value of (CoCrNi)97 Mo3 alloy is 42.6 pm 2 and -40.4 mJ/m 2 at 0 K, respectively. The relationship between mechanical properties and MSAD, SFE for various multiple principal element alloys is discussed.