Amorphous and Nano-Structured MaterialsNo Access

FORMATION OF La-Al-Ni-Cu-Fe BULK METALLIC GLASSES WITH HIGH GLASS-FORMING ABILITY

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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SHUJIE PANG

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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CHAOLI MA

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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, and

TAO ZHANG

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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https://doi.org/10.1142/S021797921006485XCited by:0 (Source: Crossref)

Abstract

The effect of alloy composition on improving glass-forming ability of La-based alloys is investigated in this work. Previous composition criteria demonstrated that the alloys with high glass-forming ability should have negative heats of mixing among the main constituent elements. In this study, the addition of Fe to a La-based La-Al-Ni-Cu alloy significantly improved the glass-forming ability, although the heat of mixing between Fe and the main element La is positive. La-Al-Ni-Cu-Fe bulk metallic glasses with diameters up to 15 mm were prepared by the method of pouring the molten alloys into a copper mold. These La-Al-Ni-Cu-Fe bulk metallic glasses exhibit relatively wide supercooled liquid region of about 50 k, and high T_rg(T_g/T_l) and γ(T_x/(T_g+T_l)) values. It is found that the addition of Fe to the La-Al-Ni-Cu alloy lowers the Gibbs free energy difference between the liquid and crystalline phases in the supercooled liquid region and enhances the glass-forming ability of the alloy.

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