Noga Piotr, Skrzekut Tomasz, Wędrychowicz Maciej
Faculty of Non-Ferrous Metals, AGH University of Science and Technology, A. Mickiewicza Av. 30, 30-059 Krakow, Poland.
Faculty of Mechanical Engineering, Institute of Materials and Biomedical Engineering, University of Zielona Góra, Prof. Z. Szafrana Street 4, 65-516 Zielona Góra, Poland.
Materials (Basel). 2023 Jul 25;16(15):5223. doi: 10.3390/ma16155223.
The paper presents the results of tests of rapid solidification (RS) aluminum alloys with the addition of silicon (5%, 11%, and 20%). Casting by melt-spinning on the surface of an intensively cooled copper cylinder allowed to obtain a metallic material in the form of flakes, which were then consolidated in the process of pressing and direct extrusion. The effect of refinement on structural components after rapid solidification was determined. Rapidly solidified AlSi materials are characterized by a comparable size of Si particles, regardless of the silicon content, and the shape of these particles is close to spheroidal. Not only Si particles are fragmented, but also the Al-Si-Fe phase, which also changed its shape from irregular with sharp edges to regular and spherical. The melt-spinning process resulted in a fine-grained structure compared to materials obtained by gravity-casting and extrusion. The influence of the high-temperature compression test on the mechanical properties of rapidly solidified materials was analyzed, and the results were compared with those of gravity-cast materials. An increase in strength properties was found in the case of the AlSi5 RS alloy by 20%, in the case of AlSi11RS by 25%, and in the case of the alloy containing 20% Si by as much as 86% (tensile test). On the basis of the homogeneity of the particle distribution determined by the SEM method, it was found that rapid solidification is an effective method of increasing the strength properties and improving the plastic properties of Al-Si alloys.
本文介绍了添加硅（5%、11%和20%）的快速凝固（RS）铝合金的测试结果。通过在强烈冷却的铜圆柱体表面进行熔体纺丝铸造，可以获得片状金属材料，然后在压制和直接挤压过程中进行固结。确定了快速凝固后细化对结构成分的影响。快速凝固的AlSi材料的特点是，无论硅含量如何，Si颗粒尺寸相当，且这些颗粒的形状接近球形。不仅Si颗粒破碎，Al-Si-Fe相也破碎，其形状也从边缘尖锐的不规则形状变为规则的球形。与重力铸造和挤压获得的材料相比，熔体纺丝工艺产生了细晶结构。分析了高温压缩试验对快速凝固材料力学性能的影响，并将结果与重力铸造材料的结果进行了比较。发现AlSi5 RS合金的强度性能提高了20%，AlSi11RS合金提高了25%，含20% Si的合金在拉伸试验中提高了高达86%。基于通过SEM方法确定的颗粒分布均匀性，发现快速凝固是提高Al-Si合金强度性能和改善塑性性能的有效方法。
