Formation of the L12-type superstructure in Cu-5.9 at.%Pd and Cu-8 at%Pd alloys

Open School-Conference of NIS Countries Ultrafine Grained and Nanostructured Materials

Volkova, E.G.^1 ; Novikova, O.S.^1 ; Volkov, A.Y.^1

M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 18 S. Kovalevskaya Str., Ekaterinburg

620108, Russia^1

关键词: Anomalous behavior;    Constant rate;    Critical temperatures;    Cu-Pd alloys;    Heating and cooling;    L12 phase;    Low temperature annealing;    Pd alloy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012029/pdf
DOI  :  10.1088/1757-899X/447/1/012029

来源: IOP

【 摘 要 】

There was performed a resistometric study of the Cu-8 at.%Pd alloy during heating and cooling with a constant rate. There was made a comparison with the change in the electrical properties of the Cu-5.9 at.%Pd alloy. In the investigated Cu-Pd alloys, the anomalous behavior of electrical properties was revealed: long low-temperature annealing increased the electrical resistivity. It was concluded that nuclei of the ordered L12 phase were formed in the Cu-5.9 at.% Pd alloy. The obtained result is in contradiction with the currently known Cu-Pd phase diagram, where the Cu-5.9Pd alloy is the fcc-solid solution. The critical temperatures of the order→disorder phase transformation in the alloys were determined.