Martin-Raya Oscar, Menargues Sergi, Martin Enric, Baile Maria Teresa, Picas Josep A
Department of Materials Science and Engineering, Universitat Politècnica de Catalunya (UPC), Rb. Exposició, 24, 08800 Vilanova i la Geltrú, Spain.
Materials (Basel). 2023 Mar 12;16(6):2280. doi: 10.3390/ma16062280.
To control the semisolid processing of aluminum alloys produced by the additive manufacturing technique, an exhaustive knowledge of their rheological behavior is required. In the semisolid state, metallic materials can show rheological characteristics similar to those of polymers, so semisolid state shaping is one of the currently considered routes for additive manufacturing with metallic materials. In this work, an approximation of the rheological control of the A356 aluminum alloy for its subsequent 3D manufacturing was carried out at a very low shear rate. A continuous cooling rheometer was designed and used, evaluating the influence of different process parameters on the viscosity variation of the aluminum alloy in the semisolid state. The results show an anomalous flow variation, indicating dilatant, and not thixotropic behavior, for very low shear rates.
为了控制通过增材制造技术生产的铝合金的半固态加工过程，需要全面了解其流变行为。在半固态状态下，金属材料可表现出与聚合物类似的流变特性，因此半固态成型是目前金属材料增材制造所考虑的途径之一。在这项工作中，在极低剪切速率下对A356铝合金进行后续3D制造的流变控制进行了近似研究。设计并使用了连续冷却流变仪，评估了不同工艺参数对铝合金在半固态状态下粘度变化的影响。结果表明，在极低剪切速率下，流动变化异常，表明为胀流性而非触变性行为。
