Advanced mechanical properties obtained via accurately tailoring stacking fault energy in Co-rich and Ni-depleted CoxCr33Ni67-x medium-entropy alloys

• DOI: 10.1016/j.scriptamat.2021.114269
• Publication Date: 2021-09-13T09:02:36Z
• Authors: Dong Huang; Yanxin Zhuang; Chunhui Wang
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract This paper designs a new Co-rich and Ni-depleted CoxCr33Ni67-x medium-entropy alloy. Among them, the content of Cr is controlled, so that the alloys studied have the same short range-order (SRO), and make the changes of Co and Ni content directly and efficiently reflected in the reduction of stacking fault energy. With the increase of Co content and decrease of Ni, the stacking fault energy of Co38Cr33Ni29 alloy is reduced to ∼12 mJ/m2, and the deformation mode is changed from twinning induced plasticity (TWIP) to transformation induced plasticity (TRIP). At the same time, the tensile strength of 839 MPa and uniform elongation of 83% are obtained.