Acta Metallurgica Sinica (English Letters) ›› 2021, Vol. 34 ›› Issue (8): 1109-1119.DOI: 10.1007/s40195-021-01222-4

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Deformation Mechanism in Fe61Mn18Si11Cr10 Medium Entropy Alloy Under Different Strain Rates

Shaoheng Sun1(), Yun Zhang2, Zhiyong Xue1(), Jiankun Lin1, Xiaohua Chen3   

  1. 1Institute of Advanced Materials, North China Electric Power University, Beijing, 102206, China
    2Institute of Engineering Technology, University of Science and Technology Beijing, Beijing, 100083, China
    3State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
  • Received:2021-03-18 Revised:2021-03-18 Accepted:2021-03-18 Online:2021-03-18 Published:2021-08-10
  • Contact: Shaoheng Sun,Zhiyong Xue
  • About author:Zhiyong Xue, xuezy@ncepu.edu.cn
    Shaoheng Sun, sunshaoheng12@qq.com;

Abstract:

We introduce a non-equiatomic Fe61Mn18Si11Cr10 medium entropy alloy designed by subjecting it to transformation-induced plasticity upon deformation at room temperature. Microstructure characterization carried out using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and X-ray diffraction (XRD) shows a homogeneous solid solution FCC + BCC structured dual phase. Investigations on the deformation substructures at specific strain levels via EBSD reveal the deformation-induced transformations of γ →  α′ and γ →  ɛ. The strengths, particularly yield strength, of the designed alloy are found to be higher than these of the well-studied five component FeMnNiCoCr system for the introduction of the hard phase (α′-martensite). When tensile tests are performed at different strain rates of 10-4 s-1, 10-3 s-1, 10-2 s-1, the tested material exhibits a slightly negative strain rate sensitivity and work hardening rate sensitivity.

Key words: Medium entropy alloy, Dual phase, Transformation-induced plasticity (TRIP) effect, Strain rate