Abstract
In this experiment, three kinds of Cu-Zn-Sn alloys with 3~5wt% Sn were melted in evacuated quartz capsules. After homogenized and hot rolled at 800℃, the specimens were quenched into -10℃ NaOH solutions from 800℃~870℃. The effects of alloy additions on the transformation temperatures were determined by differential scanning calorimetry (DSC) and by means of measuring the variation of resistivity with temperature. Microstructures and crystal structures of the specimens after heat treatments were examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the crystal structures of parent phase in Cu-Zn-Sn alloy is B2. Below the aging temperature of 250℃, it still has a good thermal stability and shape recovery. The morphologies of the precipitates were changed with different aging temperature. Two endothermic peaks between 228℃ and 342℃ were found on DSC heating curve, the first peak (250℃) is 1-plate and its structure is nearly N9R, and the second peak (300℃) is a BCC (Cu5Zn8) of precipitate.
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