Abstract:
A transformation-induced plasticity phenomenon in Fe65(CoCrMnNi)35 medium-entropy alloy was investigated. According to
the X-ray difraction 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.
