The Effect Of Cu On The Properties Of Nd-based Bulk Metallic Glasses

摘要

Diamagnetic Cu was added into hard magnetic Nd-Fe-Al bulk metallic glass in the present study. The effects on the magnetic properties and glass-forming ability (GFA) were assessed using vibrating sample magnetometer and thermal expansion method. The results show that Nd_(60)Fe_(20)Cu_(10)Al_(10) have highest GFA and the coercivity is high up to 313 kA/m as well. The former was attributed to the more negative mixing heat between Cu and Nd and the latter was caused by the emergence of ferromagnetic Fe-rich phase or cluster. Given a further increasing on copper, a sharp reduction happens to magnetic properties. This reduction can be attributed to the emergency of soft magnetic and non-magnetic crystalline phases (NdCu_5, Nd-rich phase, δ phase and Nd phase).