Temperature-induced structural evolution in liquid Sn85Zn15 eutectic alloy

Temperature-induced structural evolution in liquid Sn85Zn15 eutectic alloy
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DOI:
10.1016/j.scriptamat.2018.01.027
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发表时间:
2018-04
期刊:
影响因子:
6
通讯作者:
Xi Chen;Q. Yu;Y. Su;X. D. Wang;Q. Cao;D. X. Zhang;J. Jiang
Xi Chen;Q. Yu;Y. Su;X. D. Wang;Q. Cao;D. X. Zhang;J. Jiang
中科院分区:
材料科学1区
文献类型:
--
作者:
Xi Chen;Q. Yu;Y. Su;X. D. Wang;Q. Cao;D. X. Zhang;J. Jiang

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采用原位高能X射线衍射和从头算分子动力学模拟方法研究了液态Sn 85 Zn 15共晶合金中原子结构随温度的演化。结果表明,Sn_(85)Zn_(15)共晶合金在900 K附近存在结构交叉,在此温度以下和以上,合金的S(q)和G(r)曲线上的第一峰位移动、最近配位数和自扩散激活能都有不同的变化。这种结构交叉可能归因于局部集群的空间连接变化。我们的发现将引发更多关于金属液体中液-液结构转变的研究。
Temperature-dependent atomistic structural evolution in liquid Sn85Zn15eutectic alloy has been investigated by usingin situhigh energy X-ray diffraction andab initiomolecular dynamics simulations. We reveal a structural crossover at around 900 K in liquid Sn85Zn15eutectic alloy, below and above which the liquids exhibit different changes in first peak position shifts onS(q) andG(r) curves, the nearest coordination number and activation energies for self-diffusion. This structural crossover is likely ascribed to the spatial connectivity variation of local clusters. Our finding will trigger more studies on the liquid-to-liquid structural transition in metallic liquids.