Effect of Rare Earth and Transition Metal Elements on the Glass Forming Ability of Mechanical Alloyed Al-TM-RE Based Amorphous Alloys

doi:10.1016/j.jmst.2015.09.007

Abstract

Abstract: The present work aims to compare the amorphous phase forming ability of ternary and quaternary Al based alloys (Al₈₆Ni₈Y₆, Al₈₆Ni₆Y₆Co₂, Al₈₆Ni₈La₆ and Al₈₆Ni₈Y_4.5La_1.5) synthesized via mechanical alloying by varying the composition, i.e. fully or partially replacing rare earth (RE) and transition metal (TM) elements based on similar atomic radii and coordination number. X-ray diffraction and high resolution transmission electron microscopy study revealed that the amorphization process occurred through formation of various intermetallic phases and nanocrystalline FCC Al. Fully amorphous phase was obtained for the alloys not containing lanthanum, whereas the other alloys containing La showed partial amorphization with reappearance of intermetallic phases attributed to mechanical crystallization. Differential scanning calorimetry study confirmed better thermal stability with wider transformation temperature for the alloys without La.

Key words: Al-TM-RE amorphous alloy, Mechanical alloying, Glass forming ability, Microstructural transformation, Intermetallics, Glass transition temperature

Ram S. Maurya, Tapas Laha. Effect of Rare Earth and Transition Metal Elements on the Glass Forming Ability of Mechanical Alloyed Al-TM-RE Based Amorphous Alloys[J]. J. Mater. Sci. Technol., 2015, 31(11): 1118-1124.

Figures/Tables 6

Scanning electron micrographs of Al86Ni8Y4.5La1.5 powder mixture milled for (a) 1 h, (b) 20 h, (c) 40 h and (d) 80 h, showing decreasing particle size with progress in milling time.

Variation in crystallite size and lattice microstrain in the various powder mixtures with progress in milling time.

XRD spectra showing the variation in degree of amorphization with varying alloying composition and milling time.

High resolution TEM micrographs and corresponding selected area diffraction patterns for the alloys: (a) Al86Ni8Y6, (b) Al86Ni6Y6Co2, (c) Al86Ni8La6 and (d) Al86Ni8Y4.5La1.5 milled for 80 h showing partial amorphization with formation of nanocrystalline Al and various intermetallics.

HRTEM micrographs and corresponding selected area diffraction patterns of (a) Al86Ni8Y6 and (b) Al86Ni8La6 milled for 140 h.

DSC thermograms of (a) Al86Ni8Y6, (b) Al86Ni6Y6Co2, (c) Al86Ni8La6, (d) Al86Ni8Y4.5La1.5 milled for 140 h showing various phase transitions.

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