An X-ray absorption spectroscopy investigation of the local atomic structure in Cu-Ni-Si alloy after severe plastic deformation and ageing

作者：Azzeddine H^*; Harfouche M; Hennet L; Thiaudiere D; Kawasaki M; Bradai D; Langdon T G

来源：Philosophical Magazine, 2015, 95(23): 2482-2490.

DOI：10.1080/14786435.2015.1063790

• synchrotron X-ray diffraction
• Cu-Ni-Si alloy
• high-pressure torsion
• equal channel angular pressing
• precipitation
• severe plastic deformation

The local atomic structure of Cu-Ni-Si alloy after severe plastic deformation (SPD) processing and the decomposition of supersaturated solid solution upon annealing were investigated by means of X-ray absorption spectroscopy. The coordination number and interatomic distances were obtained by analyzing experimental extend X-ray absorption fine structure data collected at the Ni K-edge. Results indicate that the environment of Ni atoms in Cu-Ni-Si alloy is strongly influenced by the deformation process. Moreover, ageing at 973K affects strongly the atomic structure around the Ni atoms in Cu-Ni-Si deformed by equal channel angular pressing and high pressure torsion. This influence is discussed in terms of changes and decomposition features of the Cu-Ni-Si solid solution.

• 出版日期2015-8-13