Viscosity, structure and fragility of Ag-Si melts

Viscosity, structure and fragility of Ag-Si melts
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Ag-Si熔体的粘度、结构和脆性

DOI:
10.1063/1.5046317
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发表时间:
2018-08
期刊:
影响因子:
1.6
通讯作者:
Yanwen Bai
Yanwen Bai
中科院分区:
材料科学4区
文献类型:
--
作者:
Yan Zhao;Xiaoxia Hou;Yanwen Bai

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用振动粘度计和X射线衍射仪研究了AG100-xSix(x=5,7,9,11,at.%)熔体的粘度和液体结构。粘度与温度的关系和关联长度D均可用Arrhenius方程很好地拟合。粘性流动激活能Ea、V和结构演化激活能Ea、D均随Si含量的增加而增大。在液相线温度以上,配位数NS、关联半径Rc、团簇中的原子个数Nc和关联长度D均随温度的降低而增大。其中,Rc和Nc在液相线温度附近表现出明显的升高。在液-固相区,由于析出相液-固平衡反应的影响,结构参数随温度的变化表现出不同的行为。在考察粘度和结构的基础上,计算了过热熔体的脆性参数M和结构脆性参数F。波..。
Viscosities and liquid structures of Ag100-xSix (x=5, 7, 9, 11, at.%) melts were studied by an oscillating viscometer and an X-ray diffractometer. Temperature dependence of viscosity and the correlation length D all can be fitted well by Arrhenius equation. The activation energy for viscous flow Ea,V and the activation energy for structural evolution Ea,D all increase with increasing Si content. Above the liquidus temperature, the coordination number Ns, the correlation radius rc, the atom numbers in the cluster Nc and the correlation length D all increase with decreasing temperature. Among them, rc and Nc show a significant increase near the liquidus temperature. In the liquid-solid interval, the structural parameters show different behaviors with temperature due to the influence of the liquid-solid equilibrium reaction of the precipitation phase. Based on the investigated viscosity and structure, the fragility parameter of superheated melts M and the structural fragility parameter Fs were calculated. Bo...
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