Abstract
We report the suction casting of Zr65Cu27Ti8 bulk metallic glasses with diameters up to 1 mm. While the substitution of Ti for Cu increases the glass forming ability significantly, the onset crystallization temperature and the width of the supercooled liquid region decrease. This decrease is due to the appearance of an icosahedral quasicrystal phase, which crystallises from the glass at a lower temperature than the Zr2Cu devitrification product in the Zr65Cu35 glasses. Based on the results of recent structural studies of undercooled Ti/Zr-based alloys, this likely reflects the formation of icosahedral order in the undercooled liquid, which increases the nucleation barrier for the Zr2Cu phase during the quench, making glass formation easier.
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