Engineering Materials
Recrystallization temperature can be lowered by

Grain refinement
Purification of metal
All of these
Working at lower temperature

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Engineering Materials
Stress relaxation is the phenomenon

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

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Engineering Materials
The unit cells

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

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