Materials science investigates how the properties of materials are determined by structure, composition, and processing of those materials.

This requires knowledge from the fields of physics, chemistry, and engineering.

See also:
Chemistry
Physics
materials science and engineering

I might as well make this a metanode, so here are some more links:

Electromagnetic properties:
Fermi Level
semiconductor
p-n junction
bandgap
optical bandgap

Mechanical properties
shear stress
elastic deformation
plastic deformation
phonon
precipitation hardening
strain hardening

Types of materials
metallurgy
Perlite
nanotube
carbon nanotube
polymer
Liquid Crystal Polymer
Dendrimer
glass
Ceramics
composite material
intelligent material

Structure
Liquid Crystal (also liquid crystal)
crystal
crystallography
crystal classes
crystal systems
crystallographic groups
lattice
bcc
Body-Centered Cubic

Analysis
focused ion beam microscopy

I want to keep this up-to-date, so please /msg me if you know of any other materials science nodes, or if you write one yourself.