Plastic Deformation and Metal Strength

The video tutorial explains the strength of metals by examining how they react to stress. It introduces the concepts of elastic and plastic deformation, detailing how metallic bonds behave like springs during elastic deformation, allowing metals to return to their original shape. When metals are stressed beyond the yield point, plastic deformation occurs, causing permanent changes. This process can strengthen metals through work hardening, although it reduces ductility.

What happens to a metal when a force is applied to it?

• It induces stress.

• It melts.

• It becomes lighter.

• It changes color.

What is the main characteristic of elastic deformation?

• Permanent change in shape.

• Atoms slide past each other.

• Metal returns to original shape.

• Metal becomes brittle.

How do metallic bonds behave during elastic deformation?

• They become rigid.

• They dissolve.

• They act like springs.

• They break completely.

What occurs at the yield point of a metal?

• Metal becomes liquid.

• Metal atoms start to slide past each other.

• Metal changes color.

• Metal becomes magnetic.

What is a key feature of plastic deformation?

• Metal loses all strength.

• Metal becomes transparent.

• Metal can be shaped or formed.

• Metal returns to its original shape.

How does plastic deformation affect the strength of a metal?

• It makes the metal brittle.

• It can make the metal stronger.

• It has no effect on strength.

• It makes the metal weaker.

Which type of deformation allows metals to be rolled or drawn into shapes?

• Elastic deformation.

• Plastic deformation.

• Thermal deformation.

• Magnetic deformation.

What happens to metallic bonds during plastic deformation?

• They break completely.

• They dissolve in water.

• They become stronger.

• They can no longer hold atoms in position.

What is work hardening?

• A technique to color metal.

• A method to melt metal.

• A phenomenon that strengthens metal.

• A process that makes metal more ductile.

What is a consequence of work hardening on metal?

• Metal becomes more ductile.

• Metal becomes less ductile.

• Metal becomes transparent.

• Metal loses its magnetic properties.