The present invention relates to a turbine part, comprising a substrate in monocrystalline nickel-based superalloy, comprising chromium and at least one element chosen from rhenium and ruthenium, the substrate having a γ-γ 'phase, an average mass fraction of rhenium and in ruthenium greater than or equal to 4% and an average mass fraction of chromium less than or equal to 5% and preferably less than or equal to 3%, an undercoat covering at least part of a surface of the substrate, characterized in that that the sublayer has a γ-γ 'phase and an average atomic fraction of chromium greater than 5%, of aluminum between 10% and 20%, and of platinum between 15% and 25%. Figure for the abstract: Fig. 1
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