fig5

Figure 5. TEM images of alternating lamellae under the ~9% strained 18Al (A) and 19Al (B) EHEAs. The selected area electron diffraction (SAED) pattern with diffraction fringes (yellow arrows) such as trailing around diffraction spots indicates the presence of SFs. The fractography morphologies of as-cast (C) 18Al and (D) 19Al EHEAs show the mixed ductile and brittle fracture types at room temperature. Blocky phases in 18Al and 19Al EHEAs are marked by black arrows. (E) EPMA maps for the blocky phase on the fracture surface of 18Al EHEA. The blocky phase is highlighted by the black line.