Mechanical properties of amorphous metal alloy  Al87(Ni,Fe)8(REM)5 system as a result of short-term annealing

K. Khrushchyk; A. Barylski; K. Aniolek; M. Karolus; L. Boichyshyn

doi:10.15330/pcss.25.1.178-184

Authors

K. Khrushchyk Ivan Franko National University of Lviv, Lviv, Ukraine; University of Silesia in Katowice, Katowice, Poland
A. Barylski University of Silesia in Katowice, Katowice, Poland
K. Aniolek University of Silesia in Katowice, Katowice, Poland
M. Karolus University of Silesia in Katowice, Katowice, Poland
L. Boichyshyn Ivan Franko National University of Lviv, Lviv, Ukraine

DOI:

https://doi.org/10.15330/pcss.25.1.178-184

Keywords:

amorphous metal alloys based on aluminum, differential scanning calorimetry, microhardness, nanocrystallization, Young's modulus

Abstract

The phase transition temperatures for amorphous metals based on aluminum Al₈₇(Ni,Fe)₈(REM)₅ system were determined by differential scanning calorimetry (DSC). The mechanisms of formation and growth of nanocrystals in an amorphous matrix were predicted using kinetic models (Matusita model). It was found that after annealing at the temperature of stable nanocrystalline growth, an X-ray amorphous structure with a volume fraction of disordered nanocrystalline phases of solid state of Al(X), GdFe₂, AlFe₂Ni, GdFe₂ for the amorphous metal alloy (AMA) Al₈₇Y₄Gd₁Ni₄Fe₄ alloy and microcrystalline phases of solid state of Al(X), GdFe₂ AlFe₂Ni for the Al₈₇Gd₅Ni₄Fe₄ alloy are formed, which significantly affects the mechanical properties of the Al₈₇(Ni,Fe)₈(REM)₅ system. The effect of annealing on the mechanical properties of amorphous aluminum-based alloys was investigated using Oliver-Pharr and Young's modulus methods it was found that thermal modification of AMAs: Al₈₇Gd₅Ni₄Fe₄ as a result of heat treatment of AMAs from 5 to 15 min., the microhardness increases from 0.20 GPa to 2.75 GPa, and when heat treated for 60 min at a temperatures of T₃ = 645±5 K, 647±5 K, it decreases to 0.35 GPa and 0.45 GPa, respectively.

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