Microstructure and Tensile Behavior of Al^sub 8^Co^sub 17^Cr^sub 17^Cu^sub 8^Fe^sub 17^Ni^sub 33^ (at.%) High-Entropy Alloy

The details of the grain boundaries at the center of the SEM images, marked by a rectangle in Fig. 2a, c, and e, are shown at higher magnification in Fig. 2b, d, and f. Small and discontinuous pre- cipitates have been found at the grain boundaries for the as-cast alloy (see Fig. 2b). An SEM/EDX line scan analysis (not shown here) has confirmed that the precipitates are enriched in Ni, Al, and Cu. These precipitates are difficult to detect by TEM due to the discontinuity and the large grain sizes.