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首页> 外文会议>Semi-solid processing of alloys and composites XII >Rheological Properties and Microstructure of Hypereutectic Semi-Solid Al-Si-Mg Alloys Using Rheocasting Route
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Rheological Properties and Microstructure of Hypereutectic Semi-Solid Al-Si-Mg Alloys Using Rheocasting Route

机译：流变铸造法的过共晶半固态Al-Si-Mg合金的流变性能和显微组织

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The SEED rheocasting process was used to produce semi-solid slurries of hypereutectic Al-17Si-4.5Cu (A390) and Al-15Si-10.5Mg-4Cu alloys respectively. The rheological properties of these alloys in the semi-solid state were characterized at different deformation rates and at variable solid fractions using the parallel plate compression viscometry. The apparent viscosity at different shear rates was calculated using a Newtonian fluid model for increments of deformation during compression. Microstructures of both alloys, after partial solidification and compression, were examined in order to characterize the flow behavior during deformation. The comparison of the viscosity between the A390 and Al-15Si-10.5Mg-4Cu alloys indicated that the high Mg containing alloy possessed a higher viscosity for the range of shear rates and solid fractions investigated. Rheological results showed that at a given solid fraction, the viscosity of both alloys decreased significantly with increasing shear rates, indicating a shear thinning behavior. In addition, a separation of liquid and solid phases was also observed for both alloys in the microstructural study of compressed semi-solid billets.
机译：SEED流变铸造工艺分别用于生产过共晶Al-17Si-4.5Cu（A390）和Al-15Si-10.5Mg-4Cu合金的半固态浆料。使用平行板压缩粘度测定法，以不同的变形速率和不同的固体分数表征了这些合金在半固态下的流变特性。使用牛顿流体模型计算不同剪切速率下的表观粘度，以计算压缩过程中的变形增量。在部分凝固和压缩后，检查了两种合金的微观结构，以表征变形过程中的流动行为。 A390和Al-15Si-10.5Mg-4Cu合金之间的粘度比较表明，在所研究的剪切速率和固体分数范围内，高含Mg合金具有较高的粘度。流变学结果表明，在给定的固体分数下，两种合金的粘度均随剪切速率的增加而显着降低，表明剪切稀化行为。此外，在压缩半固态坯料的微观结构研究中，还观察到了两种合金的液相和固相分离。

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