Ductility and strengthening in crystalline solids

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Presentation transcript:

Ductility and strengthening in crystalline solids

Constructional materials: Metals and alloys. Ceramics. Polymers. Non-crystalline solids.

Edge dislocation

Screw dislocation Mixed dislocation

The motion of an edge dislocation

The motion of dislocation is similar to the moving of a caterpillar

Formation of a step on the crystal surface

Deformation of a single crystal Slip lines on the copper surface Deformation of polycrystalline specimen

The wrought rose The rose is made of steel

Strengthening Techniques: strengthening by grain size reduction solid solution strengthening strain hardening precipitation strengthening