Figure 3 | Scientific Reports

Figure 3

From: The Exceptional Strong Face-centered Cubic Phase and Semi-coherent Phase Boundary in a Eutectic Dual-phase High Entropy Alloy AlCoCrFeNi

Figure 3

Phase boundary strengthening in the dual-phase AlCoCrFeNi2.1 HEA. (a) At the initial state, misfit dislocations were pinned at the phase boundaries with smooth morphology. (b,c) The phase boundary structure was shown by the HADDF-STEM image and corresponding FFT pattern, characterizing a semi-coherent interface with (1–11)FCC//(0–11)BCC. (d) Ultrahigh density of dislocations piled up at the phase boundary and strongly prevented the crack from expansion. (e) Overlapped diffraction patterns from boxed regions in (d) indicating another semi-coherent interface with (−111)FCC//(011)BCC. (f) The crack penetrated through the entire BCC phase immediately while the growth direction of crack was changed by dislocation motions in FCC counterparts.

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