Phase Stability, Microstructure, and Mechanical Properties of Spark Plasma Sintered Nanocrystalline Boron-Doped AlCoFeMnNi High-Entropy Alloy

The microstructure and mechanical properties of mechanically alloyed spark plasma sintered AlCoFeMnNi-xB (x = 0, 0.5, 1, 5 at. %) high-entropy alloys (HEAs) have been investigated. Boron-doped HEAs were synthesized using alloying up to 50 h milling. Synthesized powders then consolidated at 850, 900, 950 °C for 10 min under a uniaxial pressure 40 MPa sintering (SPS). A scanning electron microscope, which was equipped with energy dispersive spectroscopy (EDS), together an optical microscope (OM) used analyze the microstructural evolution. X-ray diffraction analysis differentiate phases formed in solution. specimens analyzed shear-punch test (SPT). fracture surface SPT samples studied SEM. Thermodynamic calculations revealed that by employing this process, it is possible produce solid solution duplex FCC + BCC structure. It shown boron-doped AlCoFeMnNi contain some unique attributes. SPS 900 sample boron 0.5 % leads formation alloy highest shear strength. further increase content exhibited decrease maximum Finally, correlations between characteristics boron-containing are discussed.