Lecture
This lecture covers the concept of precipitation hardening in alloys, focusing on the Al-Cu system. It explains the three main steps of the process: solution treatment, quenching, and aging. The instructor discusses the effects of different heat treatments on the mechanical properties of the alloy, emphasizing the importance of controlling the precipitation kinetics. The lecture also delves into the challenges and limitations of precipitation hardening, such as the optimal aging time and temperature. Additionally, it explores the role of dislocations in the strengthening mechanism of metals through solid solution strengthening and work hardening. The presentation concludes with a detailed explanation of recrystallization as a mechanism to reduce dislocation density and improve material properties.