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TEM Characterization of a Refractory HEA Synthesized by High Energy Milling

High entropy alloys (HEAs) are a new class of materials that have attracted intense research interest worldwide [1]. Unlike conventional alloys, they generally consist of multiple (> 5) principal components in equimolar or near equimolar ratios. The identification of new solid solution phases in these systems has been attributed to the increased configurational entropy, hence their designation as HEAs. This concept has opened an expansive realm of unexplored alloy compositions and microstructures. Taking into consideration the number of metallic elements in the periodic table, the number of nearly-equimolar HEAs with 5 or more components is in the millions! Although a large proportion of HEAs are single phase solid solutions, many also exhibit complex multi-phase microstructures. To date, the majority of studies have focused on HEAs with constituent elements derived from the group of 3-d transition metal elements; so-called refractory HEAs with constituent elements such as Mo, Nb, Ta, V, W, Ti, Zr, Hf, V, and Ta, have received less attention [2]. However, the unique mechanical/thermal properties observed in some of these materials have captured the imagination of the scientific community. For example, in terms of high temperature behavior, it was shown by Senkov et al. that V20Nb20Mo20Ta20W20 outperforms industry standards Inconel 718 and Haynes 230, retaining high strength up to 1600 C [3].