TED-Ed: Magical metals, how shape memory alloys work - Ainissa Ramirez

The video explores shape memory alloys, metals that can remember and return to specific shapes when heated. It explains the atomic structure and phase changes that enable this behavior. A demonstration with a nickel-titanium wire shows how heat can change its shape. The video also highlights applications of these alloys, such as in the Mars Rover, medical stents, robotics, and even bras, showcasing their versatility and impact on technology and daily life.

What is the primary characteristic of shape memory alloys?

• They are transparent.

• They remember different shapes.

• They can conduct electricity.

• They are magnetic.

How do atoms arrange themselves in a shape memory alloy when it is cold?

• In a random arrangement.

• In a hexagonal arrangement.

• In a monoclinic arrangement.

• In a cubic arrangement.

What happens to the shape memory alloy wire when it is heated?

• It returns to its original shape.

• It becomes brittle.

• It changes color.

• It melts.

Which of the following is NOT an application of shape memory alloys?

• Used in underwires of bras.

• Generating electricity.

• Moving panels on Mars Rover.

• Opening clogged arteries.

How do shape memory alloys help in medical applications?

• They are used as stents to open clogged arteries.

• They are used to replace bones.

• They are used to detect diseases.

• They are used to sterilize equipment.