Thermoelectric properties of a high entropy half-Heusler alloy processed by a fast powder metallurgy route

A half-Heusler (HH) type high entropy alloy (HEA) Ti 2 NiCoSnSb has been synthesized by a fast powder metallurgy route for the first time. Mechanical alloying (MA) wet milling produced with minor fraction of HH phase. The dry resulted in desired single-phase material. Consolidation nanocrystalline mechanically alloyed spark plasma sintering (SPS) majority Interestingly, exhibited simultaneous enhancement Seebeck coefficient and electrical conductivity, maximum ZT 0.13 at 973 K observed milled alloy. band structure obtained density functional theory (DFT) was good agreement ultraviolet-visible-near infrared (UV-Vis-NIR) absorption spectroscopy results. DFT calculations microstructural analysis suggest that phase separation strongly influenced thermoelectric properties. provided rationale evolution • High mechanical alloying. Milling done under Toluene (wet MA) Argon (dry MA). MA higher figure merit than reported arc melted alloys. electronic principles calculations. It found to be UV-Vis-NIR