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本文报道了Pd-Ni-P合金的过冷实验结果,研究了冷却速度对合金过冷行为的影响。通过将样品包裹在B2O3中从而减少样品的表面非均匀生核,使得样品在极低的冷却速度下形成大块金属玻璃。在玻璃转变温度(Tg=590K)处,冷却速度低达1K/s。利用经典的均匀生核与非均匀生核理论,计算了Pd40Ni40P20合金的温度、时间转变曲线(即TTT图)。确定了合金的临界冷却速度。对结果进行了详细的讨论。This paper reports the result of undercooling experiment of Pd-Ni-P alloy. Bulk metallic glass of Pd41)Ni40P19 has been formed by thermal treatment with B2O3 as fluxing. The effect of cooling rate on the undercooling behavior was studied. The surface heterogeneous nuclea-tion was reduced by embeding the sample into B2O3 melt. Thus the cooling rate used to form the glass was as low as 1 K/s at the glass transition temperature of 590 K. The temperature-time-transformation curves were calculated by using the classical homogeneous and heterogeneous nucleation theory. The critical cooling rates for the glass formation were calculated. The resuits are discussed in some detail.
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