(西安交通大学 金属材料强度国家重点实验室
材料科学与工程学院， 710049 西安)
摘 要: 对铜锌粉末在-30 ℃、 -20 ℃以及常温条件下进行了高能球磨。 利用透射电镜、 X射线衍射仪对粉末的微观形貌、显微结构、 晶体结构进行了研究。 结果表明： -30 ℃低温可显著降低粉末塑性， 不添加过程控制剂时， 球磨过程可顺利进行， 颗粒表面平整， 呈脆性断裂特征； 常温与-30 ℃低温球磨10 h产物均为α+γ相。 -20 ℃低温不添加过程控制剂时， 冷焊作用强， 球磨不能顺利进行； 添加过程控制剂后， 球磨过程顺利进行， 颗粒尺寸最小， -20 ℃球磨10 h产物为α相、 γ相与ZnO， 继续球磨， 最终形成α相、 ZnO及未知相。
关键字: 铜锌合金； 低温； 机械合金化； 高能球磨
at cryogenic conditions
（ State Key Laboratory for Mechanical Behavior of Materials,
School of Materials Science and Engineering, Xi'an Jiaotong University,
Xi'an 710049, Shaanxi）
Abstract: Copper-zinc powders were milled at -30 ℃, -20 ℃ and room temperature for 10 h, respectively. TEM, X-ray diffractometer were used to study the micro-morphology and crystal structure of the powders. Cryo-milling at -30 ℃ without PCA(process control agent) can go smoothly because the plasticity of the powders is apparently reduced. The flat surfaces of the particles indicate the brittle fracture process. But milling under the other two conditions can't go smoothly without PCA. XRD patterns show powders prepared at -30 ℃ and room temperature consist of α phase and γ phase, but powders prepared at -20 ℃ consist of α phase, γ phase and ZnO. When milled for 24 h at -20 ℃, powders consist of α phase, ZnO and an unknown phase.
Key words: copper-zinc alloy; cryogenic; mechanical alloying(MA); high-energy-ball-milling
