By contrast, the APT reconstructions in Fig. 2b shows an interesting hierarchical microstructure, in addition to the FCC matrix and the L1 2 phases, there were nano-particles dispersion within the L1 2 phase. These nanoparticles were only present in the HT-2 state, not in the previous HT-1 state. Compositions of each phase in HT-2 state are summarized in Table 1. The calculated partitioning coefficients of Al,
In the context of cast alloy development for high temperature applications, high entropy superalloys (HESA) have exhibited superior cost specific tensile strength than that of superalloys such as CM247LC. Compositions of HESA are distinctively different from those of cast superalloys with higher contents of Fe and Ti, making HESA cheaper and lighter. Comparing to superalloys, although HESA has adopted the template of FCC-structured () matrix and coherent L1 2 -structured () precipitates, is enriched with solutes with higher intrinsic strength, rendering positive lattice misfit, and the high entropy matrix may have attributed a good combination of strength and ductility.
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