Abstract
In this work, the microstructure of CoCrFeNiTa0.4 based high entropy alloy was studied. HEAs with the same structure were prepared successfully by replacing Ta with relatively less expensive Nb (Ta0.2Nb0.1, Ta0.2Nb0.3, Ta0.2Nb0.5 replacing Ta0.4) using powder plasma arc additive manufacturing (PPA-AM), an emerging AM technology. The microstructural phases, phase hardness and mechanical properties of CoCrFeNiTa0.4 and CoCrFeNiTa0.2Nb0.1-0.5 have been analyzed. From this investigation, it is evident that the CoCrFeNiTa0.2Nb0.3 alloy can replace CoCrFeNiTa0.4 alloy with improved structure and mechanical properties along with a cost saving of 29%. This is also the first report to demonstrate the microstructure - mechanical properties relationship in CoCrFeNiTaNb high entropy alloy.
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