Engineering Materials
Stress relaxation is the phenomenon

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

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Engineering Materials
The unit cells

All of these
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

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