Studies on the bulk nanocrystalline Ni–Fe–Co alloy prepared by mechanical alloying–sintering–hot rolling route
Studies on the bulk nanocrystalline Ni–Fe–Co alloy prepared by mechanical alloying–sintering–hot rolling route
复制标题
机械合金化-烧结-热轧工艺制备大块纳米晶Ni-Fe-Co合金的研究
DOI：
10.1016/j.jallcom.2008.08.051
复制
发表时间：
2009
影响因子：
6.2
通讯作者：
R. Dube
中科院分区：
文献类型：
--
作者：
S. Vajpai;B. Mahesh;R. Dube
纳米晶Ni-Fe合金是一种非常有前途的高频软磁材料，其主要应用要求是低磁滞损耗。与传统的80Ni坡莫合金相比，机械合金化制备的纳米晶80Ni-20Fe(wt.%)合金具有更好的磁性能，这是因为在机械合金化过程中形成了以纳米晶Ni3Fe为主的相。然而，在固结过程中保持纳米结晶性以制备块状材料是一个关键问题。本文介绍了用粉末冶金法制备块体纳米晶80Ni-15Fe-5Co(wt.%)合金的方法。球磨46h后，机械合金化粉末的平均晶粒度约为10 nm。采用多步烧结-热轧工艺制备了平均晶粒度为32±2 nm、理论密度为99%的无裂纹带钢。块体纳米晶80Ni-15Fe-5Co带材的磁滞回线非常窄，表明磁滞损耗很小。研究表明，机械合金化-烧结-热轧工艺是制备块体纳米晶材料的一种很有前途的方法。
Nanocrystalline Ni–Fe alloys have emerged as a promising soft magnetic material for high frequency applications where low hysteresis loss is the prime requirement. Nanocrystalline 80Ni–20Fe (wt.%) alloys synthesized by mechanical alloying have shown improved magnetic properties as compared to conventional 80Ni Permalloy due to formation of nanocrystalline Ni3Fe as major phase during mechanical alloying. However, retaining nanocrystallinity during consolidation to prepare bulk material is a key issue. The present paper describes preparation of bulk nanocrystalline 80Ni–15Fe–5Co (wt.%) alloy by a powder metallurgy route involving mechanical alloying of elemental powder mixture followed by sintering and hot rolling. The average grain size of the mechanically alloyed powder was approximately 10nm after milling for 46h. A multi-step sintering–hot rolling route was developed to prepare a crack-free strip having an average grain size 32±2nm and 99% theoretical density. The bulk nanocrystalline 80Ni–15Fe–5Co strip resulted in a very narrow hysteresis loop indicating a very small hysteresis loss. The present study shows that mechanical alloying–sintering–hot rolling route can be a promising method for producing bulk nanocrystalline materials.