(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: 采用自制球磨機(jī)機(jī)械合金化Ti/Al二元粉末，研究了機(jī)械合金化過程中粉末結(jié)構(gòu)的變化。結(jié)果表明：Ti50Al50混合粉經(jīng)高能球磨后，顆粒尺寸迅速增大 而后快速下降，Ti，Al晶粒各自逐漸細(xì)化至納米尺寸；進(jìn)一步球磨，顆粒尺寸減小甚微；晶粒尺寸進(jìn)一步細(xì)化導(dǎo)致形成非晶，但在此過程中并沒有發(fā)現(xiàn)Ti-Al金屬間化合物的形成；隨球磨時(shí)間的延長，粉末顯微硬度開始略有下降，然后迅速增加，在基本形成非晶后，保持恒定值。
關(guān)鍵字: Ti/Al粉末； 機(jī)械合金化； 組織結(jié)構(gòu)
（School of Materials Science and Engineering， Harbin Institute of Technology，
Harbin 150001， P.R.China）
Abstract:The changes of powder microstructures of Ti/Al binary powder during mechanical alloying were investigated. The results showed that the granular size of composite powders rapidly increases at first， and then promptly decreases， and gradually to magnitude of nanometer. After further milling, the amorphous material is formed due to grain minimizing. In the whole process, no Ti-Al intermetallic compound was found to come into being. With the milling time increasing, the microhardness decreases a little at first， and then rapidly increases， in the end it keeps a constant when amorphous microstructure is basically formed.
Key words: Ti/Al powder; mechanical alloying; microstructure
