(西安交通大學 金屬材料強度國家重點實驗室
材料科學與工程學院， 710049 西安)
摘 要: 對銅鋅粉末在-30 ℃、 -20 ℃以及常溫條件下進行了高能球磨。 利用透射電鏡、 X射線衍射儀對粉末的微觀形貌、顯微結構、 晶體結構進行了研究。 結果表明： -30 ℃低溫可顯著降低粉末塑性， 不添加過程控制劑時， 球磨過程可順利進行， 顆粒表面平整， 呈脆性斷裂特征； 常溫與-30 ℃低溫球磨10 h產(chǎn)物均為α+γ相。 -20 ℃低溫不添加過程控制劑時， 冷焊作用強， 球磨不能順利進行； 添加過程控制劑后， 球磨過程順利進行， 顆粒尺寸最小， -20 ℃球磨10 h產(chǎn)物為α相、 γ相與ZnO， 繼續(xù)球磨， 最終形成α相、 ZnO及未知相。
關鍵字: 銅鋅合金； 低溫； 機械合金化； 高能球磨
at cryogenic conditions
LIU Guo-yuan, ZHU Rui-hua
（ 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
