Heat Treatment of Metals ›› 2021, Vol. 46 ›› Issue (3): 116-120.DOI: 10.13251/j.issn.0254-6051.2021.03.024

• MATERIALS RESEARCH • Previous Articles     Next Articles

Effect of La addition on as-cast microstructure and hardness ofFeMnCrNiCo high entropy alloy

Dong Fang1, Mao Ning1, Qu Wei2   

  1. 1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
    2. Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Baotou Inner Mongolia 014010, China
  • Received:2020-11-27 Online:2021-03-25 Published:2021-05-08

Abstract: Effect of La addition on as-cast microstructure and hardness of FeMnCrNiCo high entropy alloys (HEAs) was investigated. The microstructure and hardness of the FeMnCrNiCo and FeMnCrNiCoLa0.2 HEAs were analyzed by means of XRD, OM, EDS and Vickers hardness tester. The results show that with the addition of La, the dendrite of the HEA is refined by 49.1%, and the phase structure changes from a single fcc solid solution to the composite structure containing fcc phase and LaNi phase, and the brittle LaNi phase distributes continuously in the interdendrite region. The brittle LaNi compound and grain refinement increase the hardness of the alloy by 37%.

Key words: high entropy alloy, La, microstructure, hardness

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