Indication of liquid-liquid phase transition in CuZr-based melts

Indication of liquid-liquid phase transition in CuZr-based melts
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CuZr 基熔体中液-液相变的指示

DOI:
10.1063/1.4826487
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发表时间:
2013-10
影响因子:
4
通讯作者:
Yue, Yuanzheng
Yue, Yuanzheng
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Sun, Qijing;Qin, Jingyu;Bian, Xiufang;Yue, Yuanzheng

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我们研究了CuZr基熔体的动态行为远远高于液相线温度。结果表明,在冷却过程中,这是由于在这些熔体中的一个潜在的液-液相变(LLPT)的粘度的不连续的变化。在相同温度范围内的热力学响应进一步验证了LLPT。我们发现,LLPT在Cu 46 Zr 46 Al 8熔体是可逆的,在1350 K以上反复加热和冷却。基于金属熔体中流体团簇的概念,将可逆低密度相变归因于冷却过程中强有序高密度液体向弱局域低密度液体的结构转变。
We study the dynamic behavior of CuZr-based melts well above the liquidus temperature. The results show a discontinuous change in viscosity during cooling, which is attributed to an underlying liquid-liquid phase transition (LLPT) in these melts. The LLPT is further verified by thermodynamic response in the same temperature region. We find that the LLPT in the Cu46Zr46Al8 melt is reversible above 1350 K upon repeated heating and cooling. Based on the concept of fluid cluster in metallic melts, the reversible LLPT is attributed to the structural transition from the strongly ordered high-density liquids to the weak-local low-density liquids upon cooling.
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