Abstract:
High entropy alloys have garnered a lot of attention due to their impressive
mechanical properties even at high temperature conditions compared to
conventional alloys. In this study the High entropy alloys have been developed
through two processing routes to understand the effect different processing
conditions have on the resulting properties of the high entropy alloy. Electromagnetic
levitation was used to process a NiCoCrNb high entropy alloy at low undercooling to
form a high entropy alloy at equilibrium having FCC and Laves phase giving
microhardness values of 800HV while Powder metallurgy route was used to make
two NiCoCrNb samples at 18 hours of milling with 1050C sintering temperature and
28 hours of milling with 1100C sintering temperature. The 18hr-1050C sample
showed improper sintering with high porosity and low densification; this resulted in
low hardness values of 120HV. While the 28hr-1100C sample showed higher
densification and higher hardness values of around 430HV which showed the
formation of an HEA and proper sintering. The significant improvement in properties
of the powder metallurgy samples in this study help us conclude that the powder
metallurgy route offers promising results in improving the mechanical properties of
the high entropy alloy with slight changes in processing parameter.
