铌-铝化合物的机械合金化制备及机理  

Preparation by mechanical alloying and mechanism of Nb-Al compound

作　　者：盛娅峥[1] 王兴庆[1] 李俊[1] 

机构地区：[1]上海大学材料科学与工程学院有色冶金系,上海200072

出　　处：《粉末冶金材料科学与工程》2011年第6期906-911,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：上海市科委重点基础研究项目(08JC1410100)

摘　　要：研究高能球磨制备Nb/Al化合物的工艺,探索在高能球磨过程中Nb、Al形成化合物的机理。结果表明,通过高能球磨可获得Al在Nb中的固溶体,固溶度与球磨转速和球磨时间成正比,并发现选用硬脂酸作为添加剂有利于Nb/Al的机械合金化。对高能球磨中机械合金化的机理进行了讨论,指出高能球磨产生的高比表面能和高密度晶体缺陷大大降低了整体的扩散激活能,使得在高温条件下才能发生的扩散和固溶反应在室温条件下也能进行。The preparation process of Nb/Al compounds by high-energy ball milling was researched in the present paper. And the formation mechanism of Nb/Al compounds during the high ball milling process had been explored. The result shows that Nb/Al solid solution can be formed through high-energy ball milling. The solid solubility is directly proportional to speed and time of milling. It is helpful for mechanical alloying to add stearate as a process additive. The mechanism of mechanical alloying is that high surface energy and high-density crystal defects reduce the diffusion activation energy. So the diffusion and solid solution reaction can occur at room temperature.

关 键 词：高能球磨 Nb/Al机械合金化 合金扩散 

分 类 号：TF821[冶金工程—有色金属冶金]