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Modeling and Simulation of ΔH in Solid State Synthesis of Nanocomposites Al-Cu-Zr



Author(s)

M. Aboelsoud

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DOI:10.17265/2161-6213/2021.1-3.003

Physics Dept., The University College in Al-Qunfudah, Umm Al-Qura University, Al Qunfudah 21912, KSA

Amorphous structure generated by high-energy ball miller (BM) is often used as a precursor for generating nanocomposites through controlled devitrification. The amorphous forming composition range of ternary Al-Cu-Zr system was calculated using the extended Miedema’s semiempirical model. Eleven compositions of Al-Cu-Zr system showed a wide range of negative enthalpy of mixing (-ΔH^mix) and amorphization (-ΔH^amor) among the constituent elements was selected for synthesis by BM. They yielded either nanocomposites of partial amorphous and crystalline structure or no amorphous phase at all in the as-milled condition. The Al₈₈Cu₆Zr₆ alloy with relatively small negative ΔH^mix (-0.4 kJ/mol) and ΔH^amor (-14.8 kJ/mol) became completely amorphous after 120 h of milling.

Al-Cu-Zr nanocomposite materials, high-energy BM, X-ray diffraction (XRD) and transmission electron microscope (TEM), Miedema model analysis.