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

Allotropic change
Heat treatment
Recrystallization
Precipitation

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Engineering Materials
Amorphous material is one

Which is not attacked by phosphorous
Which emits fumes on melting
In which atoms align themselves in a geometric pattern upon solidification
In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

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