Modification of the phase composition and structure of the quasicrystalline Al–Cu–Fe alloy prepared by plasma spraying

The structural-phase state of quasicrystalline coatings of the Al–Cu–Fe alloy produced under different thermal conditions of plasma spraying (different contact temperatures $T_k$ of the substrate) has been investigated. It has been shown that sprayed coatings are heterophase with the dominant content of the icosahedral $\psi$ and cubic $\beta$ phases, the formation and fractional ratio of which depend on spraying conditions. The distribution of probabilities $P$(QS) of quadrupole splitting in experimental $\gamma$-resonance spectra has been analyzed. The dependence of hyperfine interaction parameters (QS, $A$) on spraying conditions of the coating has been established. Five nonequivalent positions of resonant iron atoms, the appearance and filling of which are determined by spraying conditions, have been revealed.