Acta Metallurgica Sinica (English Letters) ›› 2020, Vol. 33 ›› Issue (8): 1159-1165.DOI: 10.1007/s40195-020-01088-y

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Revealing a Transformation-Induced Plasticity (TRIP) Phenomenon in a Medium-Entropy Alloy

Ibrahim Ondicho1,2,3(), Bernard Alunda4, Dicken Owino5, Luke Otieno6, Melody Chepkoech7   

  1. 1Department of Mechanical Engineering, Dedan Kimathi University of Technology, Private Bag-10143, Nyeri, Kenya
    2Materials, Design and Manufacturing (MADEMA) Group, Dedan Kimathi University of Technology, Private Bag-10143, Dedan Kimathi, Nyeri, Kenya
    3Department of Advanced Root Industry Engineering, Yuengnam University, Gyeongsan, South Korea
    4Department of Mining and Minerals Processing Engineering, Taita Taveta University, P.O. Box 635-80300, Voi, Kenya
    5Department of Mechanical Engineering, Inha University, Incheon, South Korea
    6School of Mechanical Engineering, Kyungpook National University, Daegu, South Korea
    7Department of Mechanical Engineering, Howard University, Washington, DC, USA
  • Received:2020-04-15 Revised:2020-05-23 Online:2020-08-10 Published:2020-08-06
  • Contact: Ibrahim Ondicho


A transformation-induced plasticity phenomenon in Fe65(CoCrMnNi)35 medium-entropy alloy was investigated. According to the X-ray diffraction patterns, the as-cast specimen contains a single-phase face-centered cubic (fcc), while low-temperature annealing at 500 °C and 600 °C leads to the introduction of a body-centered cubic (bcc) phase as a secondary phase. Further increment of the annealing temperature to above 700 °C eliminates the bcc phase, and the microstructure was found to contain a single-phase fcc. At 20% true strain, an fcc-to-bcc phase transformation is observed; whereas, at 28% true strain, an fcc-to-hcp phase transformation takes place as an additional deformation mechanism. This strain-induced phase transformation phenomenon leads to improved tensile properties of this alloy.

Key words: Phase transformation, X-ray diffraction, Mechanical behavior, Microstructure evolution, Multicomponent alloys