Metallic glasses and shape memory alloys

How are metallic glasses formed?

• By increasing rapidly heating

• By melting it

• By increasing rapidly cooling

• By rapidly heating and then slowly cooling

Which of the following is the most commonly used technique for the preparation of metallic glass?

• Melt spinning system

• Twin roller system

• Melt extraction system

• Sputtering

When does metal transform into the glass?

• At Curie temperature

• At critical temperature

• At melting point of the metal

• At glass transition temperature

Which of the following is a metallic glass?

• Argon

• Crypton

• Nickel

• Gold

Which of the following is true about metallic glasses?

• Low core loss

• Non-malleable

• Hexagonal closely packed structure

• Low electrical resistance

When does a shape memory alloy return to its original shape?

• At normal temperature

• At memory transfer temperature

• At transition temperature

• At Curie temperature

Why is NI-Ti alloy used in making eye frames?

• Because they are not flexible

• Because they are hard to break

• Because they are SMA

• Because they are hard

Which one of the following phase of SMA is relatively soft and easily deformed at low temperature?

• Austenite

• Martensite

• Metallic glasses

• Ceramics

Which type of crystal structure exhibits by Austenite phase?

• Cubical

• Hexagonal

• Tetragonal

• Trigonal

In SMA the difference in transition temperature between heating and cooling process VI's known as

• Super elasticity

• Shape memory effect

• Hysteresis

• Pseudo elasticity