Abstract
Ability to form simple solid solution contrary to complex phase makes multi-component High Entropy Alloys (HEAs) promising new generation alloys. The present study deals with the oxidation and corrosion resistance of AlCoCrFeTi high entropy alloy synthesized by Mechanical alloying (MA) and consolidated using Spark plasma sintering (SPS). Elements in the alloy system were selected with small size factor to avoid the formation of amorphous phase. Powder diffraction study confirms dissolution of elemental addition into a single phase body centered cubic system. Milled powders were sintered at 900 °C, 45 MPa and with a holding time of 15 min. Spark plasma sintering results in minor traces of face centered cubic phase along with body centered cubic system. Relative density of sintered sample is 98.5%. Thermal stability of the milled powder is analyzed using Differential Scanning Calorimetry. Vickers microhardness test on sintered sample reveals a hardness value of 1074.5 HV. Synthesized alloy exhibits excellent corrosion resistance and linear oxidation kinetics with a very low weight gain.
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