(哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001)
摘 要: 研究了機械球磨Ti50Al50復(fù)合粉的組織與壓制特性。結(jié)果表明，球磨導(dǎo)致粉末硬度增加，壓制特性變差，這是由于球磨使層片結(jié)構(gòu)細(xì)化，Ti和Al組元晶體缺陷增加和晶粒細(xì)化造成的；但球磨3h形成納米晶復(fù)合粉后，尤其是在球磨7.5*#h開始發(fā)生非晶轉(zhuǎn)變后，進(jìn)一步球磨，粉末壓制特性變化并不明顯。
關(guān)鍵字: 機械球磨; Ti50Al50復(fù)合粉；壓制特性
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
