温度对Cu-Zn二元系粉末机械合金化的影响

Temperature Effect on Mechanical Alloying of Cu-Zn Binary

将Cu-40%Zn(40%为质量分数)二元系粉末在-30℃和常温下进行高能球磨,并利用X射线衍射仪及扫描电子显微镜对球磨过程中的组织演变过程及微观形貌进行了研究.研究结果表明:Cu-40%Zn二元系粉末的机械合金化过程是一个Cu向Zn中扩散、固溶与反应的过程,最终产物为Cu0.64Zn0.36(α相)与少量的ZnO相;低温球磨合金粉末的晶格畸变量与晶粒尺寸都比常温球磨的大;与常温球磨不同,低温球磨可以抑制冷焊所带来的不良影响,避免添加过程控制剂,而且体系呈现脆性-脆性特征.

Cu-40%Zn powder is milled at -30 ℃ and room temperature respectively with a high energy mill. The phase transformation and microstructure are observed under X-ray diffractometer and scanning electron microscopy. The mechanical alloying of Cu-40 %Zn indicates diffusing of Cu into Zn to finally form Cu0. 64 Zn0.36 and ZnO. The lattice distortion of the alloyed powder in lowemperature milling is stronger than that in room temperature milling. The grain size of the powder milled at low temperature is bigger than that at room temperature. The negative effect of cold welding can be depressed in low-temperature milling without adding process control agent. The Cu-Zn binary system belongs to ductile-ductile system in room temperature milling, but it manifests the characteristic of brittle-brittle system when milled at low temperature.