Abstract
The decomposition and precipitation behaviors of a quenched Cu–15wt%Sn alloy as a function of aging temperature were investigated using transmission electron microscopy (TEM). Focused ion beam (FIB) was employed to assist TEM specimen preparation. At 300 °C, the decomposition of the supersaturated α′ phase occurred at grain boundaries, displaying a cellular morphology. The lamellae were found with ζ and α phases, rather than with the equilibrium ε and α phases. The ζ and α phases exhibit a well-defined orientation relationship (OR) as \( (1\bar{1}0)_{\alpha } //(0001)_{\zeta } ,\;[11\bar{2}]_{\alpha } //[\bar{1}2\bar{1}0]_{\zeta } \). On the other hand, at 320 °C, only incipient lamellar structures of several micron meters were observed, which were composed of the δ and α phases. At the same time, abundant intragranular precipitation of the ε phase in the form of platelets was observed, and OR as \( (1\bar{1}1)_{\alpha } //(001)_{\varepsilon } , \) [110] α //[100] ε exists between ε phase and the α phase. These contrasting precipitation behaviors are discussed from the viewpoint of crystallographic coherency of these phases.
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This study was financially supported by the China Scholarship Council (No. 2010602038) and the Ministry of Science and Technology of China (No. 2010DFA51650).
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Wang, ZJ., Toyohiko, K.J. & Ma, CL. Comparative TEM investigation on the precipitation behaviors in Cu–15wt%Sn alloy. Rare Met. 32, 139–143 (2013). https://doi.org/10.1007/s12598-013-0033-1
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DOI: https://doi.org/10.1007/s12598-013-0033-1