(哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001)
摘 要: 研究了机械球磨Ti50Al50复合粉的组织与压制特性。结果表明，球磨导致粉末硬度增加，压制特性变差，这是由于球磨使层片结构细化，Ti和Al组元晶体缺陷增加和晶粒细化造成的；但球磨3h形成纳米晶复合粉后，尤其是在球磨7.5*#h开始发生非晶转变后，进一步球磨，粉末压制特性变化并不明显。
关键字: 机械球磨; Ti50Al50复合粉；压制特性
prepared by mechanical milling
（School of Materials Science & Engineering,
Harbin Institute of Technology, Harbin 150001, P.R.China）
Abstract:The microstructure and compactibility of Ti50Al50 composite powders prepared by mechanical milling from mixed elemental titanium and aluminum powders were investigated. The results show that hardness of Ti50Al50 composite powders increases and their compactibility become worse with increasing milling time owing to the refinement of the lamellar structure, the increase of crystal defects, and the decrease of the grain size of both Ti and Al phases. For milling duration longer than 3 h, due to forming nanocrystalline composite powders, especially for milling duration longer than 7.5 h, owing to transforming into amorphous, the compactibility of powders has no substantial change.
Key words: mechanical milling; Ti50Al50 composite powders; compactibility
