元素微调对机械合金化Al-Cu-Ti非晶合金成分优化的影响

摘要

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%.%为了将 Al−Cu−Ti 非晶合金中的晶体相含量降到最低，通过调整 Cu 和 Ti 元素的含量和球磨时间对Al65Cu35−xTix合金进行优化设计。研究结果表明：增加Ti元素的含量能够降低AlCu2Ti、Cu9Al4和Al2Cu等金属间化合物的含量；而延长球磨时间可以降低合金中元素相的含量，最终确定的最优成分为Al65Cu16.5Ti18.5。另外，所有优化合金中都存在 TiH2相，这是由于在球磨作用下工程控制剂甲苯分解出的 H 原子与 Ti 元素反应生成了TiH2。TiH2在最优成分Al65Cu16.5Ti18.5合金中的体积分数为4.30%。