This episode examines the role of dislocations in plastic deformation and how their movement governs the mechanical behavior of metals. It introduces the concept of dislocation density and explores common sources of dislocations. Key strengthening mechanisms—grain size reduction, solid-solution strengthening, and strain hardening—are detailed, highlighting how each impedes dislocation motion. The episode concludes with an overview of heat treatment processes such as recovery, recrystallization, and grain growth, and their effects on these strengthening methods.

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