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Study on synthesis and grain growth kinetics of in-situ TiB2/Fe3Al nanocomposite (Ⅰ)--Mechanical alloying of Fe-Al-Ti-B quaternary powder
Author(s): 
Pages: 45-49
Year: Issue:  3
Journal: TRANSACTIONS OF MATERIALS AND HEAT TREATMENT

Keyword:  Fe3Al复合材料机械合金化结构演变纳米晶;
Abstract: 研究了机械合金化过程中Fe-Al-Ti-B四元粉体的结构演变,讨论了其合金化机制.研究表明,Fe-Al-Ti-B四元粉体的机械合金化通过Al、Ti、B原子向Fe晶格中扩散形成Fe(Al,Ti,B)过饱和固溶体.在机械合金化的早期(<10h),形成包覆结构的复合颗粒,合金化尚未进行.在机械合金化的中期(10-60h),首先形成具有几个同心圆环结构的复合颗粒,然后环状结构消失,同时Fe(Al,Ti,B)晶格常数迅速增加,但成分均匀化过程缓慢.在机械合金化的后期(60-80h),主要发生复合颗粒内部的成分均匀化过程,球磨80h后,复合颗粒内部各组元的成分已经非常均匀.Fe(Al,Ti,B)晶粒细小(6.8nm),晶格畸变严重,具有近似非晶态的结构.由于Ti、B元素的添加,Fe-Al-Ti-B四元粉体晶粒细化速率更快,但合金化速率明显降低.
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