Engineering Materials
The unit cells

All of these
Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
Have the same orientation and their similar faces are parallel
May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice

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

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

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