On the Stability Limits of the Undercooled Liquid State of Pd-Ni-P
On the Stability Limits of the Undercooled Liquid State of Pd-Ni-P
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DOI：
10.1016/s0921-5093(96)10659-6
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发表时间：
1997-06
期刊：
影响因子：
6.4
通讯作者：
G. Wilde;S. Klose;W. Soellner;G. Görler;K. Jeropoulos;R. Willnecker;H. Fecht
中科院分区：
文献类型：
--
作者：
G. Wilde;S. Klose;W. Soellner;G. Görler;K. Jeropoulos;R. Willnecker;H. Fecht
易玻璃形成的金属合金Pd-Ni-P在深过冷液态下表现出优异的抗晶化性能。在本工作中，利用没有晶化的情况，通过扩展等温退火，在玻璃化转变以下的不同温度下平衡大块非晶样品。在玻璃化转变区可获得比热数据和平衡粘度数据。通过密度和体积膨胀的测量，可以得到过冷液体的热膨胀系数。在典型降温速率下的冻结自由体积可确定为0.3%量级。讨论了过冷液态的稳定性判据。
The easy glass-forming metallic alloy Pd-Ni-P exhibits an exceptional resistance against crystallization in the deeply undercooled liquid state. In the present work, the absence of crystallization was utilized to equilibrate bulk amorphous samples at different temperatures below the glass transition by extended isothermal annealing. Specific heat data and equilibrium viscosity data could be obtained in the glass transition region. From density and volume expansion measurements the thermal expansion coefficient of the undercooled liquid could be derived. The free volume frozen-in at typical cooling rates could be determined to be in the order of 0.3%. The results are discussed with regard to stability criteria of the undercooled liquid state.