Topic: Material Science
When a material is strain hardened?
- A. its yield strength reduces and ductility increases
- B. its yield strength increases and ductility reduces
- C. both yield strength and ductility increases
- D. both yield strength and ductility reduces
Answer: B. its yield strength increases and ductility reduces
Explanation: When a material undergoes strain hardening (also known as work hardening), its yield strength increases because of dislocation movements and dislocation generation within the crystal structure, which restrict further plastic deformation. As a result of this increased resistance to deformation, the material's ductility is reduced.