Lecture
This lecture explores the solidification process and microstructure of aluminum-silicon alloys, focusing on the reasons behind the formation of shrinkage voids and the use of risers to prevent them. It also discusses the impact of different elements on the properties of the alloys, such as strontium and sodium, and the methods to improve mechanical properties. Additionally, it covers the classification and designation systems of aluminum alloys, highlighting the differences between wrought and casting alloys. The lecture concludes with a comparison between aluminum and copper alloys, emphasizing the differences in mechanical properties and crystal structure.