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What determines the density of the material?
The atoms, type of crystal structure, how much empty space, and porosity
All solids desire what?
An atomic packing arrangement that minimizes the total energy of the system
What are examples of close packed patterns?
ABA and ABC
What is the grain?
A single crystal of a material oriented in some arbitrary direction
What are grain boundaries?
Disordered boundary areas between mis-oriented single crystal grains
What constitutes microstructure?
Size and relative orientation of grains
The presence of of long range order is what makes a material…
crystalline
Which rotational symmetries can fill all space?
1,2,3,4,6
