The Studies Of Al-Fe-Zr-Nd Alloys By Mechanical Alloying

Compared with traditional crystalline materials, amorphous alloys have excellent physical, chemical and mechanical properties. So it attracts more and more attentions in the past years.In this paper, the nano-crystalline or amorphous Al-Fe-Zr-Nd are prepared by mechanical alloying. The evolution of microstructure, morphology, thermal stability and micro-hardness of alloys were analyzed by XRD, SEM, DSC and HV-1000, respectively. The evolution of microstructure and the amorphous forming ability of Al-based, Zr-based and Nd-based alloys were systematically studied.As for Al65Fe30-xZrxNd5(x=5,10,15,20), the easiest amorphous forming composition was found for the alloy with Zr composition x=15. After milling50h, the samples of Al65Fe15Zr15Nd5is full amorphous, and no structural changing was found for prolonging milling time to120h. This indicates that amorphous Al65Fe15Zr15Nd5alloy is mechanically stable. The peak temperature of crystallization for Al65Fe20Zr10Nd5after milling90h and120h are868K and883K respectively, and those of Al65Fe15Zr15Nd5,are898K and903K accordingly. For Zr70-xFe2oAl10Ndx (x=0,3,6,10) alloy, they are all amorphous after milling different time. The time needed for the atmorpization is decreased with the content of Nd increasing. The peak temperature of crystallization for Zr70-xFe2oAl10Ndx (x=0,3,6,10) alloys are1313K,1328K,1323K and1328K, respectively. As for Nd60-xFe3oAl10Zrx(x=0,5,10,15) alloys, Nd5oFe3oAl10Zr10is full amorphous after milling90h and unchanged even milling to150h, this indicates its good mechanically stability. The peak temperature of crystallization is1018K for milled90h. As for Nd4oFe3oAl10Zr15, partial amorphous was obtained after milling150h.