元素微调对机械合金化Al-Cu-Ti非晶合金成分优化的影响.pdfVIP

Trans. Nonferrous Met. Soc. China 25(2015) 3348−3353 Effect of element fitting on composition optimization of Al−Cu−Ti amorphous alloy by mechanical alloying Zhen TAN1, Yun-fei XUE1,2, Xing-wang CHENG1,2, Long ZHANG3, Wei-wei CHEN1,2, Lu WANG1,2, Hai-feng ZHANG3, Hua-meng FU3 1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China; 2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081, China; 3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Received 25 November 2014; accepted 7 May 2015 Abstract: In order to minimize the crystal phase in Al−Cu−Ti amorphous powder, Al65Cu35-xTix amorphous powders were optimized via ball milling through adjusting the amount of Cu and Ti elements and the ball milling time. The results show that increasing the mole fraction of Ti can decrease the amount of AlCu2Ti, Cu9Al4, and Al2Cu intermetallics formed during the process of ball milling; and prolonging the ball milling time can reduce the element crystalline phase to almost none. The optimal composition is determined to be Al65Cu16.5Ti18.5. TiH2 forms in all selected Al65Cu35−xTix amorphous powders during the process of optimization. H atom is decomposed from toluene and reacts with Ti during ball milling, leading to the formation of TiH2. The volume fraction of TiH2 in Al65Cu16.5Ti18.5 amorphous powder is measured to be 4.30%. Key words: Al-based amorphous alloy; process optimization; wet milling; TiH2 1 Introduction In recent years, Al-based amorphous alloys have attracted considerable attention due to high strength and low density. Currently, rapid qu