Electron Structure, Stability and Nanocrystallization of Al - Based Amorphous Alloys

Abstract

Electron transport studies of Al-based alloys show that the strong bonds between Al-TM and Al-Y atoms arise by mixing of 3d and 4d electron states of TM and Y atoms with the 3s and 3p states from Al. Thermal stability of the Al-RE alloys is controlled by the low diffusity of heavy RE atoms. The results allow to optimize preparation conditions for nanocrystallizing Al-based alloys with enhanced mechanical properties.

Electron transport properties of Al–Sm and Al–Sm–Ni amorphous and nanocrystalline alloys

“…The electrical resistivity was measured in a range 300-800 K by DC four-probe method with accuracy of 0.01%. The thermoelectric power was measured by differential method [5,6]. The heating rate during both the measurements was 10 K/min.…”

“…The enhanced threshold crystallization temperatures T x , revealing the relatively higher stability of amorphous phase, are found in alloys with raising Ni content. Such a tendency is probably due to the bonding interaction between Al and Ni atoms, which refrain an rearrangement of amorphous matrix leading thus to nanocrystallization [1,5]. …”

Influence of quasicrystalline phase on transport processes in Zr70Pd30 amorphous alloy

“…It was observed that thermoelectric power of QCs varies strongly and nonsystematically even at small changes of the Fermi energy occurring due to the composition variation [18]. Electrical resistivity and thermoelectric power (TEP) measurements are very sensitive experimental techniques which can be successfully applied to analysis of crystallization of metallic glasses [19][20][21]. In this study we apply those methods to investigate quasicrystal-forming Zr 70 Pd 30 amorphous alloy.…”