液氮球磨过程中钛粉的形貌和组织演变

Morphology and Microstructure Evolution of Ti Powder during Cryomilling

摘要:

采用液氮球磨技术制备出纳米晶钛粉。运用SEM、XRD和TEM研究了液氮球磨过程中钛粉的形貌和组织的演变。结果表明：钛粉颗粒在液氮球磨过程中以脆性开裂的方式细化，经8 h液氮球磨后钛粉颗粒从球磨前的45 μm减小到5 μm左右，颗粒表面出现大量裂纹；采用液氮球磨方法制备纳米晶Ti粉仅需8 h。

Abstract:

Nanocrystalline Ti powder was prepared using cryogenic mechanical milling. The evolution of morphologies and structures for Ti powder during cryomilling were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The experimental results show that the particle sizes decrease from original 45 mm to 5 mm after 8 h cryomilling. Embrittlement cracking is the dominating way of the refinement for Ti particles. The time required for preparing nanocrystalline Ti powder by cryomilling technique is only 8 h.