Signs of the presence of an ordered phase in the Cu-5.9 at.% Pd alloy after its long-term annealing at a moderate temperature

O.S. Novikova ORCID logo , A.E. Kostina ORCID logo , E.G. Volkova, Y.A. Salamatov, A.V. Glukhov, A.Y. Volkov, V.V. Marchenkov, V.S. Gaviko, Y.M. Ustyugov show affiliations and emails
Received: 10 July 2022; Revised: 20 September 2022; Accepted: 20 September 2022
Citation: O.S. Novikova, A.E. Kostina, E.G. Volkova, Y.A. Salamatov, A.V. Glukhov, A.Y. Volkov, V.V. Marchenkov, V.S. Gaviko, Y.M. Ustyugov. Signs of the presence of an ordered phase in the Cu-5.9 at.% Pd alloy after its long-term annealing at a moderate temperature. Lett. Mater., 2023, 13(1) 3-8


We observed the ordered phase particle experimentally by the TEM method. The temperature of the order–disorder phase transition in the Cu-5.9Pd alloy was estimated as Tc ≈ 340°С.The structure and electrical properties of the Cu-5.9 at.% Pd alloy were studied after its annealing for two months at 250°C. As a result of such a long-term thermal treatment, in the XRD patterns taken from the alloy one can observe a weak superstructural (100) reflection, which seems abnormal, since the alloy can only be in the state of a disordered single-phase solid solution (as it follows from the generally accepted Cu-Pd phase diagram). Quantitative analysis of the X-ray diffraction patterns reveals the presence of two new phases with different contents of Pd. An assumption is made that L12 superstructure can be formed in the Pd-enriched phase. The specific features observed in the temperature dependence of electrical resistivity, as well as the TEM results, confirm this set-forth hypothesis of ours. Using the resistometric method, the temperature of the order-disorder phase transition in the alloy was estimated as Tc ≈ 340°С. It is concluded that the position of the A1-(A1 + L12) phase boundary in the Cu-Pd phase diagram requires more precise definition in the region of compositions on the side of the low Pd content.

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1. M. N. Mikheev Institute of Metal Physics - This work was carried out within the state assignment themes “Pressure” 122021000032-5.