机械合金化制备FeNbVB纳米晶粉末的研究

Nanocrystalline FeNbVB Powder Prepared by Mechanical Alloying

摘要: 采用机械合金化法制备了Fe84Nb3V4B9纳米晶粉末,并利用扫描电镜、X射线衍射仪等对其形貌、结构和热稳定性进行了分析.结果表明：组分为Fe84Nb3V4B9的混合粉体在球磨96h后,α-Fe相平均晶粒尺寸约为10nm;此后于100~350℃退火没有新相生成,并且纳米晶粒无明显长大,表现出较好的热稳定性;钒元素的加入能够增加粉末的均匀性、细化晶粒、加速合金化过程以及增加合金相的耐热稳定性,因此,钒部分替代铌制备FeMB纳米晶软磁材料具有明显的可行性和经济效益.

Abstract: Nanocrystalline Fe84Nb3V4B9 powders were prepared by mechanical alloying.The morphology,structure and thermal stability were studied by SEM observation,XRD analysis and heat treatment.The average grain size of α-Fe phase in Fe84Nb3V4B9 powders milled for 96h was about 10 nm.The nanocrystals exhibited good thermostability,and grew slowly during low-temperature annealing at 100-350℃.The V addition could improve powder uniformity,refine crystals,promote alloying process and enhance thermal stability of the alloy phase,suggesting that the replacement of V for Nb is beneficial to development of FeMB nanocrystalline soft magnetic materials.