Viscosity of Al–Cu liquid alloys: measurement and thermodynamic description

Viscosity of Al–Cu liquid alloys: measurement and thermodynamic description
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AlâCu 液态合金的粘度:测量和热力学描述

DOI:
10.1007/s10853-012-6710-x
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发表时间:
2012
影响因子:
4.5
通讯作者:
B. Hallstedt
B. Hallstedt
中科院分区:
材料科学3区
文献类型:
--
作者:
M. Schick;J. Brillo;I. Egry;B. Hallstedt

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本文用高温振荡杯粘度计测量了二元Al-Cu合金的粘度。粘度对温度的依赖性可以用阿耳忒弥斯定律很好地描述。对于恒定的温度,作为铜浓度的函数的粘度在摩尔分数xCu = 0.7处表现出最大值。这可能是由于在该组成下液相中的明显化学短程有序。由于现有的描述粘度作为组成的函数的唯象模型与实验数据的比较是不令人满意的,在这项工作中,仅基于一些假设,并使用混合焓作为输入参数,这是很容易获得的一个新的粘度模型已经开发。模型计算值与实验数据吻合良好。
In the present work a high temperature oscillating cup viscometer has been used to measure the viscosities of liquid binary Al–Cu alloys. The dependence of viscosity on temperature is well described by the Arrhenius law. For constant temperature, the viscosity as a function of copper concentration exhibits a maximum at a mole fractionxCu= 0.7. This might be due to a pronounced chemical short range order in the liquid phase at this composition. As the comparison of existing phenomenological models describing viscosity as a function of composition to the experimental data is unsatisfactory, a new model for the viscosity has been developed within this work based only on a few assumptions and using the enthalpy of mixing as input parameter which is easily accessible. The agreement between model calculation and experimental data is excellent.
DOI: --
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