Formation and characterization of amorphous-nanocrystalline Al_(80)Fe_(10)M_(10) [M = Fe, Nb, Ti, Ni, (Ni_(0.5)Ti_(0.5))] alloys

摘要

In this study, the formation and characterization of amorphous-nanocrystalline phases in Al_(80)Fe_(10)M_(10) [M = Fe, Ti, Nb, Ni, (Ni_(0.5)Ti_(0.5))] powder mixtures by means of mechanical alloying (MA) have been investigated. The milled samples were characterized using X-ray diffraction (XRD), differential scanning calo-rimetry (DSC) and transition electron microscopy (TEM). Performed mechanical alloying in different alloying systems showed that, only in Al_(80)Fe_(10)Ni_(10), Al_(80)Fe_(10)Ti_(10) and Al_(80)Fe_(10)Ti_5Ni_5 powder mixtures amorphous phase can be formed. The produced amorphous phases in these systems, exhibit one-stage crystallization on heating (at temperature up that 850 °C) and the activation energy for crystallization is more than 300 kj/mol. The crystallization mechanism of amorphous phase in these three systems is different and the thermal stability of amorphous phase in Al_(80)Fe_(10)Ti_5Ni_5 alloy is more than Al_(80)Fe_(10)Ti_(10) and Al_(80)Fe_(10)Ti_(10).