1. What are grains and grain boundaries in a material? I suggest you focus on metals. Explain how material properties are affected by the size of these grains.
Grain boundaries in metals are the alignment of atoms in the material when it is produced. These boundaries effect the brittleness and firmness of the material.
2. How does one engineer or process materials to reduce the grain size? In particular, I would like for you to explore and then explain how single crystal silicon is produced for the solar industry.
By heating the materials to a very high temperature and cooling them quickly one can lower the grain size. Crystal silicon is melted and held below 1417C and a single crystal seed starts to grow then cooled.
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