Engineering Materials
Amorphous material is one

Which is not attacked by phosphorous
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
Which emits fumes on melting

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Engineering Materials
Which of the following statement is true about brittle fracture?

Brittle fracture is always preceded by noise
High temperature and low strain rates favour brittle fracture
Cup and cone formation is characteristic for brittle materials
Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

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