Question

Deformation by slip occurs in

• A. Ceramics
• B. Composites
• C. Metals
• D. Nonmetals

Hint:

Slip deformation primarily occurs in metals due to their crystalline structure and metallic bonding which provide many active slip systems.

Answer 1

The Correct Option is C

Step 1: Understanding Slip Mechanism Slip is the process by which plastic deformation is produced by dislocation motion within a crystal structure. It occurs when sufficient shear stress is applied, and atoms shift from one equilibrium position to another along defined crystallographic planes known as slip planes. Step 2: Why in Metals? Metals have: - Close-packed crystal structures (like FCC, BCC, HCP) with many slip systems. - Non-directional metallic bonds, allowing atoms to slide over each other easily without breaking bonds. This makes metals highly ductile and allows them to undergo plastic deformation primarily through slip. Step 3: Why not in Others? - \textit{Ceramics:} Brittle due to ionic/covalent bonding; dislocations cannot move easily. - \textit{Composites:} Typically a mix, not pure slip-driven deformation. - \textit{Nonmetals:} Often lack the crystalline structure or bonding nature required for slip.