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Ce-rich misch metal (Mm)-based bulk metallic glasses (Mm consists ofCe, La, Pr and Nd) with high glass-forming ability are developed in Mm-Co-Al alloy system. The critical diameter for glass-formation is 10, 5 and 3 mm, and the supercooled liquid region ΔT x (ΔT x = T x -T g , T x is crystallization temperature and Tg is glass transition temperature) are 27, 90 and 79 K for Mm 6 5 Co 2 5 Al 1 0 (Mm65), Mm 6 0 Co 2 0 Al 2 0 (Mm60) and Mm 5 5 Co 2 5 Al 2 0 (Mm55) alloys, respectively. Reduced glass transition temperature T r g (T r g = T g /T m , where T m , is melting temperature) is 0.62, 0.65 and 0.69 for Mm65, Mm60 and Mm55, respectively. The employment of the misch metal, which comprises multi-rare earth elements. instead of pure Ce in the Ce-Al-Co system can improve the glass-forming ability in spite of the tiny atomic size difference of the rare earth metals. The present alloy system is an exception to the criteria of ΔT x , T g / m and different atomic size distribution as well as negative heat of mixing used for evaluating the relative GFA.

Ce-Rich Misch Metal-Based Bulk Metallic Glasses with High Glass-Forming Ability