Decagonal quasicrystals in Al–Pd–Fe

The Al–Pd–Fe decagonal phase with ∼1.6 nm periodicity was found to solidify from the liquid phase in alloys between about 73–82 at% Al and 10–17 at% Pd. Being metastable it is formed at cooling rates as low as 5 °C/min. During TEM experiments the decagonal phase decomposed, depending on composition, into either the multi-twinned orthorhombic ε16-phase or the complex nanodomain intermediate state.