The ductility of a sample transverse to the direction of rolling will be greater than that of a longitudinal sample.

• A. True
• B. False
• C. Cannot be determined
• D. Depends on material

Answer: (B)

Ductility in rolled metals is directionally dependent because rolling shapes the microstructure. The process stretches grains and creates a texture with elongated grains aligned along the rolling direction. When a tensile load is applied along that direction, dislocations can move more easily through the aligned grains and the material can undergo more plastic deformation before necking, giving higher ductility. In the transverse direction, the load crosses many elongated grains and grain boundaries, which hinders dislocation motion, promoting localization of strain and earlier fracture, so ductility is typically lower. Therefore, the statement that ductility transverse to the rolling direction will be greater is not correct in general; rolling-direction ductility is usually greater, with possible exceptions for specific materials or textures.