What is the difference in fatigue behaviour of mild steel and duralumin?

The fatigue behavior of mild steel and duralumin differs primarily due to their material properties. Mild steel typically exhibits a lower fatigue strength compared to duralumin, which can withstand higher cyclic loads due to its higher yield strength and better fatigue resistance. Additionally, duralumin tends to show less plastic deformation before failure, making it more prone to sudden fracture under fatigue loading. Overall, duralumin's superior fatigue characteristics make it more suitable for applications requiring lightweight and high-strength materials.