The effects of γ'' and γ' precipitates on the properties of the Cu-Be alloy have been investigated by many researchers. The hardness changes measurements and differential scanning calorimetry (DSC) dilatation analysis were used in this study to investigate the effect of the precipitated phases for the cold rolled and non-deformed specimens during isothermal and low heating rate aging of 2℃/min. Through an isothermal aging, the hardening and contraction strongly increased at an early aging time for the cold rolled Cu-Be alloy. In addition, the DSC curves revealed an exothermic peak from γ''phase. This peak increased and shifted to lower aging time by increasing the cold rolling reduction. On the other hand, with 2℃/min aging, the hardness remarkably increased at lower aging temperatures for the cold rolled specimens. Additionally, the contraction from the dilatation curves and the exothermic peaks shifted to lower temperature with cold rolling. The hardening of Cu-Be alloy is believed to be from γ' phase, but the contraction of the alloy and the first exothermic peak in DSC curves from γ'' phase. Keywords: precipitation hardening – transmission electron microscopy – age hardening –solution treatment–cold rolling

Keywords: precipitation hardening – transmission electron microscopy – age hardening –solution treatment–cold rolling