Microstructure Evolution of FeCrNiMn Duplex High Entropy Alloys During High-Temperature Compression

To investigate the microstructure evolution during high-temperature deformation of the duplex high entropy alloys (HEAs), compression tests were performed at temperatures from 900 degrees C to 1050 degrees C with different strain rates. Four typical flow curves were selected and the corresponding microstructures were analyzed to investigate the dynamic recrystallization (DRX) and texture evolution of the duplex HEAs. The results show that the flow curves are totally different for samples deformed at the strain rate of 0.1 and 0.01 s(-1). The difference of mechanical flow curves is correlated with the DRX and texture evolution process. Two-component textures combining the <110> and <100> components are obtained after compression at 1050 degrees C and 0.1 s(-1). It is attributed to the dominance of diffusion-controlled solute drag at high temperature. Moreover, the effect of bcc phase relies on interphase boundary and strain heterogeneity around these particles, since no phase transformation occurs and most of the strain is accommodated by fcc phase.