Abstract
We present the thermophysical properties and eutectic growth of undercooled liquid Zr91.2Si8.8 alloy at electrostatic levitation state. The obtained maximum undercooling is 371K, which reaches up to 0.2TE. The density of liquid alloy decreases linearly with increasing temperature. The ratio of specific heat to emissivity is measured and the specific heat is derived accordingly. The solidification microstructure is composed of αZr and Zr3Si phases and displays a transition from lamellar eutectic to anomalous eutectic with the enhancement of undercooling. The growth velocity of lamellar eutectic is measured to be only 1mm/s, whereas it increased to 90mm/s for anomalous eutectic.
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