Study of disordering processes in a copper-palladium alloy
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Disordering processes in aCu-40 at.% Pd alloy are studied by the method of successive quenching. For analyzing the transformations, measurements of electrical resistance and microhardness are supplemented by x-ray diffraction. For certain quench temperatures the ordered and disordered phases are present at the same time. On increasing the quench temperature the amount of ordered phase is reduced; the crystal lattice constants of the main and precipitated phases nevertheless remain constant within the limits of experimental error. During the transformation the microhardness diminishes and the electrical resistance increases, constant values being reached at a quench temperature of 760‡C, at which the alloy is completely disordered. The transition from the ordered to the disordered state occurs without the formation of any intermediate metastable phases. An x-ray diffraction analysis of the alloy reveals the orientational relationship between the matrix and precipitated phases. Experiments indicate the following mutual directions  bcc ∥fcc and  bcc ∥fcc.
KeywordsCrystal Lattice Diffraction Analysis Lattice Constant Experimental Error Metastable Phasis
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