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Amorphous (Ti,Zr, Hf)NiCu ternary alloys with a wide supercooled liquid region

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Abstract

Ternary TiNiCu, ZrNiCu and HfNiCu amorphous alloys were found to exhibit a distinct glass transition combined with rather wide supercooled liquid region before crystallization. The largest temperature interval of the supercooled liquid region defined by the difference between TgTx, i.e. ΔTx (= TxTg, is 55 K for Ti50Ni25Cu25, 60 K for Zr60Ni20Cu20 and 65 K for Hf60Ni20Cu20. These amorphous alloys with the largest ΔTx values also exhibit the highest Tx and the lowest melting temperature and crystallize through asingle-stage exothermic reaction leading to the simultaneous precipitation of more than two kinds of compound. It is therefore presumed that the appearance of the wide supercooled liquid region before crsystallization is due mainly to the necessary of the redistribution of the constituent elements for the precipitation of the compounds from the homogeneously mixed amorphous structure.

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