Sunkari, Upender and Chatterjee, Subhradeep and Bhattacharjee, Pinaki Prasad and et al, .
(2019)
Microstructure and properties of intermetallic strengthened CoCrFeNi2.1Nbx high entropy alloys.
In: Proceedings Intermetallics, 2019, Bad Staffelstein, Germany.
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Abstract
High entropy or complex concentrated alloys (HEAs/CCAs) were originally conceived as single phase alloys having simple crystal structures [1]. Some of the recent research in these alloys has been directed at increasing the strength of ductile (FCC) single phase alloys by adding one or more complex intermetallic phases for their potential applications as structural materials. It widely expanded the field of HEAs to include non-equiatomic concentrated alloys with multiple phases [2, 3]. The addition of Nb in the single phase HEAs has been considered very promising for improving high temperature strength properties [4]. However, with the increase in Nb-content, the amount of Laves phase in these alloys increases and thereby resulting in a loss of ductility. In order to restore the ductility in the base alloy and also to maximize the benefits of Nb addition, we have designed and developed novel complex intermetallic containing CoCrFeNi2.1Nbx (x=0.2, 0.4) HEAs by arc melting. In this paper, we present the microstructure and mechanical properties of CoCrFeNi2.1Nbx HEAs in the as-cast and annealed conditions.
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