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Oct
26
answered Does Nucleation Occur during Phase Equilibrium?
Oct
23
awarded  Revival
Oct
22
answered The physics behind Google Glass' “prism”
Oct
4
answered Acceleration of an object dropped inside an accelerating elevator
Oct
2
awarded  Supporter
Oct
2
answered Comparison between isobaric, isothermal and adiabatic expansion
Oct
2
answered Keplerian Telescope Exit Pupil Location - Whats the Basis for It's Formula?
Oct
2
answered Why does a Ball bounce back if Forces are Equal and Opposite?
Sep
23
awarded  Editor
Sep
23
revised Beryllium Vacuum Sphere Boat/Aircraft
added 239 characters in body
Sep
23
answered Beryllium Vacuum Sphere Boat/Aircraft
Oct
3
comment Eutectic systems behavior near 100%-0% composition and low temperature
As you cool down into the two phase region the A-rich crystal can no longer hold the B in solution. The B will start to diffuse out of the A rich crystals and form new B rich crystals. This will normally happen at the grain boundaries and so you end up with lots of tiny B-rich crystals around the larger A-rich crystals. This does indeed all happen in the solid phase. Even in a solid, atoms can diffuse around the lattice. But if you cool faster than the atoms can diffuse you can force a material into a single phase. But then the standard phase diagram in the original question would not apply.
Jan
14
awarded  Teacher
Jan
14
answered Eutectic systems behavior near 100%-0% composition and low temperature