采用Couette型同轴双筒流变仪对半固态A356铝合金的等温稳态表观粘度进行了测试. 结果表明: 半固态A356合金的稳态表观粘度(ηa)随着固相分数(fs)的增加而增加, 但随剪切速率(γ)的增大而减小, 当fs达到某一临界值之后, ηa迅速增加.可用方程ηa=2.79exp(6.27 fs)γ-0.7描述fs,γ对ηa的影响.
The rheological behavior of the semi-solid slurry of A356 aluminum alloy has been studied through a Couette-type viscometer. The experimental results show that the apparent viscosity of semi-solid A356 alloy increases with the fraction solid increasing, but decreases with the shearing rate increasing in the steady-state. When the solid fraction reaches a critical value, the apparent viscosities increase rapidly. An empirical equation that shows the effect of fraction solid and shearing rate on the apparent viscosity of semi-solid A356 alloy is built as the following, =13.61exp(6.09 ) -1.01.
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