Engineering Materials
Points of arrest for iron correspond to

Stages at which allotropic forms change
Stages at which further heating does not increase temperature for some time
There is nothing like points of arrest
Stages at which properties do not change with increase in temperature

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Engineering Materials
The unit cells

All of these
May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
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

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Engineering Materials
Stress relaxation is the phenomenon

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

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