Atomic dynamics in binary Zr-Cu liquids
Atomic dynamics in binary Zr-Cu liquids
复制标题
DOI：
10.1209/0295-5075/107/46001
复制
发表时间：
2014-08
期刊：
影响因子：
--
通讯作者：
Fan Yang;Dirk Holland-Moritz;J. Gegner;P. Heintzmann;Florian Kargl;C. Yuan;G. Simeoni;Andreas Meyer
中科院分区：
文献类型：
--
作者：
Fan Yang;Dirk Holland-Moritz;J. Gegner;P. Heintzmann;Florian Kargl;C. Yuan;G. Simeoni;Andreas Meyer
我们研究了Cu自动力学和液体密度的Zr 66.7Cu 33.3，Zr 35.5Cu 64.5，Zr 36 Cu 64，和Zr 38.2Cu 61.8液体使用无容器的处理技术和准弹性中子散射相结合。我们表明，Cu的自动力学的组成依赖性是定性控制的液体堆积密度。因此，它在窄的组成范围内是单调的，并且对小的组成变化不敏感。类似地，用Ni代替Cu导致Zr-Ni液体中的较慢的原子动力学，这是由于更致密的堆积。这与玻璃形成行为的强组成依赖性和Zr-Cu比Zr-Ni合金更好的玻璃形成能力形成对比，这通常有利于缓慢的液体动力学。因此，在Zr-Cu的情况下，玻璃形成能力与液体动力学和堆积密度不直接相关。
We studied Cu self-dynamics and liquid density of Zr66.7Cu33.3, Zr35.5Cu64.5, Zr36Cu64, and Zr38.2Cu61.8 liquids using a combination of containerless processing techniques and quasielastic neutron scattering. We show that the composition dependence of the Cu self-dynamics is qualitatively controlled by the liquid packing density. It is hence monotonic within a narrow composition range and not sensitive to small composition variations. Similarly, replacing Cu by Ni results in a slower atomic dynamics in the Zr-Ni liquids, as a consequence of the more dense packing. This is in contrast to the strong composition dependence of the glass-forming behaviour, and the better glass-forming ability of the Zr-Cu over Zr-Ni alloys, which usually favours sluggish liquid dynamics. Thus, in the Zr-Cu case, the glass-forming ability is not directly correlated with liquid dynamics and packing density.