Novel image analysis to determine the si modification for hypoeutectic and hypereutectic Al-Si alloys

Figure 2 shows that the average area of the silicon particles has an overlap between the Al-Si eutectic and primary silicon particles. Only Al-Si eutectic particles exist between 0 µm^sup 2^ and 50 µm^sup 2^ in area and only primary silicon particles were observed larger than 1,100 µm^sup 2^. Moreover, 99.95% of the primary silicon particles have an area of less than 500 µm^sup 2^. Therefore, this was used as an upper limit for the Al-Si eutectic particles and a lower limit for the primary silicon ones.