Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Ce-Rich Misch Metal-Based Bulk Metallic Glasses with High Glass-Forming Ability
Ran LiShujie PangHua MenTao Zhang
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2005 Volume 46 Issue 10 Pages 2291-2294


Ce-rich misch metal (Mm)-based bulk metallic glasses (Mm consists of Ce, 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 ΔTxTx=TxTg, Tx is crystallization temperature and Tg is glass transition temperature) are 27, 90 and 79 K for Mm65Co25Al10 (Mm65), Mm60Co20Al20 (Mm60) and Mm55Co25Al20 (Mm55) alloys, respectively. Reduced glass transition temperature Trg (Trg=TgTm, where Tm 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 ΔTx, TgTm and different atomic size distribution as well as negative heat of mixing used for evaluating the relative GFA.

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© 2005 The Japan Institute of Metals and Materials
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