利用光学显微镜、扫描电镜、x射线衍射仪及电化学腐蚀试验、切削试验等,观察并研究了65CuZn3 Si合金和65Cuzn1Si合金热处理前后微观组织、腐蚀性能和切削性能的变化.结果表明:在水冷条件下,随退火温度的升高,65CuZn3Si合金γ相晶粒尺寸逐渐变小,且有富含Si、P的纳米级颗粒状质点析出;当退火温度达到800 ℃时,γ相尺寸仅为1～5 μm,合金的切削性能得到明显的改善;同时,其耐腐蚀性能也有所提高.而含Si量较低的65 CuZn1 Si合金,热处理对其性能的改善并不明显.
Microstructure of 65CuZn3Si and 65CuZn1Si alloys after heat treatment was studied by means of optical microscope (OM),scanning electron microscopy (SEM),X-ray diffraction (XRD),and the corrosion and cutting properties of the alloy were evaluated through the electrochemical corrosion test and cutting test.The results indicate that under the conditions of water cooling,the size of γ phase of the 65CuZn3Si alloy becomes smaller with the increasing of annealing temperature.Meanwhile,the rich Si,P new nano-scale precipitates are observed in the alloy after heat treatment.When annealing at 800 ℃,the size of γ phase is only about 1-5 μm and the machinability of the 65CuZn3Si alloy is improved significantly.At the same time,the corrosion resistance of the 65CuZn3Si alloy is improved too.However,the influence of heat treatment on the properties of the 65CuZn1Si alloy is unobvious.
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