Summary
We have prepared Cu-1, 2, 4 at % Ag alloys by arc-melting and investigated their age-hardening and precipitation behaviors by using hardness tests, conductivity measurements, and TEM. The evolution of hardness during annealing exhibited strong composition dependence: the 4 at % Ag alloy aged for 20 min at 450°C already showed the maximum hardness, while the 2 at % Ag alloy began to harden after 9 h ageing. The maximum hardness was followed by gradual decrease, while electrical conductivity steadily increased to nearly 90% IACS. The observed precipitates in the 4 at % Ag alloy aged for 20 min consist of rod-shaped fee Ag precipitates, which grow in the [110]Cu direction, and whose cross-sections are elliptic with an ellipticity greater than two. Widely interspaced precipitates then appear abruptly in the 4 at % Ag alloy aged for 27 h. These observations have been discussed from the view points of the morphology and crystallography.
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Shizuya, E., Konno, T.J. (2008). A Study on Age Hardening in Cu-Ag Alloys by Transmission Electron Microscopy. In: Fujikawa, Y., Nakajima, K., Sakurai, T. (eds) Frontiers in Materials Research. Advances in Materials Research, vol 10. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-77968-1_16
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DOI: https://doi.org/10.1007/978-3-540-77968-1_16
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