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在自行研制的Al-Cu合金流变性能测试装置上研究了富Ce混合稀土对Al-5%Cu合金固液共存区流变行为的影响。结果表明,稀土能不同程度地提高合金在固液共存区的流变参数(剪切模量G,粘滞系数η和屈服极限T_s)。合金的凝固温度区间可分成流变参数急剧升高的低温区和缓慢升高的高温区,两区间的分界线温度与该合金的准固相线温度大体相同。在低温区,稀土使流变参数升高的速率比高温区大。稀土还能使分界线温度左移。
The effect of Ce-rich rare earth on the rheological behavior of Al-5% Cu alloy in solid-liquid coexistence zone was investigated on a self-developed Al-Cu alloy rheological tester. The results show that the rare earth can improve the rheological parameters (shear modulus G, viscosity coefficient η and yield limit T_s) of the alloy in the solid-liquid coexistence area to varying degrees. The solidification temperature range of the alloy can be divided into the low temperature region where the rheological parameters increase sharply and the slowly rising high temperature region. The boundary temperature of the two regions is substantially the same as the quasi-solidus temperature of the alloy. In the low temperature zone, the rate of increase of rheological parameters by rare earth is higher than that of high temperature zone. Rare earth can make the boundary temperature left.