Engineering Materials
A reversible change in the atomic structure of steel with corresponding change in the properties is known as

Allotropic change
Molecular change
Solidus change
Physical change

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Engineering Materials
Thermoplastic materials are those materials which

Are used as a friction lining for clutches and brakes
Are flexible and can withstand considerable wear under suitable conditions
Do not become hard with the application of heat and pressure and no chemical change occurs
Are formed into shape under heat and pressure and results in a permanently hard product

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