Abstract
In this research, phase transformations and porosity formation were analyzed for a heat-treated Cu-20Sn alloy. Reached porosity levels led to introduce a new method for manufacturing Cu-Sn foams with micropores, which could be part of a whole manufacturing process to obtain hierarchical foams. Microporosity generation was possible by modifying the conventional heat-treatment to the Cu-20Sn alloy, overheating it at 400, 550, 750 and 800 °C for 1, 3 and 5 h, followed by quenching in water. In all cases, phase transformations took place, which was analyzed using X-ray Diffractometry (XRD), Optical Microscopy (OM), and Scanning Electron Microscopy (SEM). Results also showed the formation of connected and not-connected pores, although extensive porosity was only generated under certain conditions. The highest porosity was 21 %, obtained for a heat-treatment of 750 °C during 1 h due to the transformation of β phase, reaching maxima pore sizes of ∼200 μm.
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