Tensile Strength: The maximum amount of tensile (pulling) stress that an object/material can take before failure i.e., before breaking or permanent deformation occurs.
Brittleness: A characteristic of materials that break or shatter instead of bending when subjected to stress; opposite of ductility.
Strain Hardening (Work Hardening): The process by which metal becomes stronger and harder due to plastic deformation caused by heat treatment or through working such as hammering or bending.