Engineering Materials
The unit cells

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

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Engineering Materials
Stress relaxation is the phenomenon

In which deformation tends to loosen the joint and produces a stress reduced
Stress reduces on increasing load
In which stress remains constant on increasing load
In which parts are not loaded

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Engineering Materials
Combined carbon in iron makes the metal

Hard and gives a coarse grained crystalline structure
Soft and gives a fine grained crystalline structure
Hard and gives a fine grained crystalline structure
Soft and gives coarse grained crystalline structure

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