Abstract
An ordered CuAu alloy, which had relatively coarse grains (5 to 10 μm), without the lamellar structure, is mechanically tested at temperatures from 77 to 658 K. The temperature dependence of the yield stress is shown to be anomalous with a maximum nearT p≈573 K. The TEM analysis reveals the presence of single dislocations, superdislocations and microtwins. Long rectilinear dislocations at 523 K are identified as blocked screw superdislocations with the Burgers vector type <101]. Numerous curved single dislocations are seen, but blocked single dislocations are not detected. Various models are discussed to account for the specific deformation behavior of the ordered CuAu alloy.
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Dr. O.V. Antonova is a Senior Researcher at the Institute of Metal Physics, Ural Branch RAS. She is a specialist in electron microscopy and investigates the dislocation structure, microstructure and phase transformations of ordered metals and intermetallics.
Prof. B.A. Greenberg is a Professor and Head of Laboratory at the Institute of Metal Physics, Ural Branch RAS. Her scientific interests focus on a wide scope of problems in materials science, including phase transformations and the theory of strength.
Dr. A.Yu. Volkov is a Leading Researcher at the Institute of Metal Physics, Ural Branch RAS. He studies microstructure, phase transformations, physical and mechanical properties of ordered alloys based on gold and noble metals.
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Antonova, O.V., Greenberg, B.A. & Volkov, A.Y. Deformation behavior and dislocation structure of CuAu ordered alloy. Gold Bull 41, 326–335 (2008). https://doi.org/10.1007/BF03214890
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DOI: https://doi.org/10.1007/BF03214890