新型Y-Fe-Co-B大块非晶合金的制备与磁性能研究

Fabrication and Magnetic Properties of Y-Fe-Co-B Bulk Metallic Glasses

摘要:

用水冷铜模吸铸方法制备了最大截面直径为2mm的Y6Fe60.5Co11.5B22铁基大块非晶合金，研究了冷却速率对合金磁性能的影响，分析并计算了合金的临界冷却速率。大块Y6Fe6.5Co11.5B22非晶合金具有良好的软磁性能：其矫顽力Hc=2．53A／m，饱和磁化强度Ms=1．24T，初始磁化率明显高于相同成分的晶态合金。热稳定性分析表明，该合金具有较高的非晶形成能力，其形成非晶的临界冷却速率（Rc）约为119K／s。

Abstract:

A new Y6Fe60.5Co11.5B22 Fe-based bulk metallic glass with a maximum diameter of 2 mm has been fabricated by suction casting method in a water-cooled copper mould. The interrelationship between cooling rates and magnetic properties were investigated and the critical cooling rate of the amorphous alloy was calculated. The bulk amorphous alloy has a coercivity of 2.53 A/m,a saturated magnetization of 1.24 T,and a high initial susceptibility. The critical cooling rate (Rc) of the Y6Fe60.5Co11.5B22 amorphous alloy was determined to be about 119 K/s.