a) Why are grain boundaries favorable regio n for nucleation and growth of precipitates??

b)

.. Describe and illustrate the following types of defects in the metal lattices..

1)).. Vacancy 2).. Edge dislocation

c) An ASTM grain size determination is being made from a microgra phs at a magnification of 200X.. What is the ASTM grain size number of a metal if there are 64 grains per square inch on the micrograph?? (11 point))

Question

a) Why are grain boundaries favorable regio n for nucleation and growth of precipitates??

b)

.. Describe and illustrate the following types of defects in the metal lattices..

1)).. Vacancy 2).. Edge dislocation

c) An ASTM grain size determination is being made from a microgra phs at a magnification of 200X.. What is the ASTM grain size number of a metal if there are 64 grains per square inch on the micrograph?? (11 point))

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