Lipiński Tomasz
University of Warmia and Mazury in Olsztyn, 10-719 Olsztyn, Poland.
Materials (Basel). 2023 Jul 26;16(15):5250. doi: 10.3390/ma16155250.
Aluminum-silicon alloys require modification due to their coarse-grained microstructures and resulting low strength properties. So far, research into the modification process has focused on the use of various chemical components and technological processes, the tasks of which are to refine the microstructure and, thus, increase the mechanical properties of the alloy. In this paper, the answer to the question of whether the form of the modifier influences the modification effect of the hypoeutectic silumin will be found. The tests were carried out using the popular silumin AlSi7Mg. To answer our research question, the alloy was modified under comparable conditions using the following elements: Ti, B, and master alloys AlTi1.5 and AlB1.5. Modifiers in the form of Sr and master alloy AlSr1.5 were also used. All mentioned modifiers were produced and introduced into the liquid alloy in the form of a powder and a rod. Master alloys AlSr1.5 were also produced via cooling from the liquid state through cooling in air and the second variant at a speed of 200 °C/s (in the form of powder and a thin strip). The microstructure and mechanical properties were analyzed based on the following measures: tensile strength, elongation, and hardness of silumin. Based on the conducted research, it was found that the form of the modifier also affects the modification effect visible in the form of changes in the microstructure and mechanical properties. For the powder-modified alloy, greater fineness in the eutectic phase (α and B phases) and an increase in all analyzed mechanical properties were obtained.
铝硅合金由于其粗大的微观结构以及由此导致的低强度性能而需要变质处理。到目前为止，对变质处理过程的研究主要集中在使用各种化学成分和工艺过程上，其任务是细化微观结构，从而提高合金的机械性能。在本文中，将找到变质剂的形式是否会影响亚共晶铝硅合金变质效果这一问题的答案。试验使用了常见的铝硅合金AlSi7Mg。为了回答我们的研究问题，在可比条件下使用以下元素对合金进行变质处理：Ti、B以及中间合金AlTi1.5和AlB1.5。还使用了Sr形式的变质剂和中间合金AlSr1.5。所有上述变质剂均以粉末和棒材的形式生产并引入到液态合金中。中间合金AlSr1.5也通过从液态空气冷却以及以200℃/s的速度冷却的第二种方式（以粉末和薄带的形式）生产。基于以下指标分析微观结构和机械性能：铝硅合金的抗拉强度、伸长率和硬度。基于所进行的研究发现，变质剂的形式也会影响变质效果，这种效果以微观结构和机械性能的变化形式体现。对于粉末变质的合金，共晶相（α相和β相）具有更高的细化程度，并且所有分析的机械性能都有所提高。
