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Phase Diagrams (Binary phase diagram (Questions that could be asked (What…

- - - - Solid and liquid
    - - L and alpha, or beta
    - - Number
  - - - In between L and L + solid
    - - In between solid and L + solid
    - - In between solid and solid alpha + solid beta
  - - - alpha -> beta + gamma
    - - alpha -> beta + L
    - - L -> alpha + beta
- - - - Fine
        
        Low temp, nice and dainty at low temps
      - Coarse
        
        High temp, burn that shit, now it's rough and ugly
    - - Heat up Pearlite or Bainite
- - - - Slow, supercooling
      - Happens at T lower than Tm
      - r* is the minimum radius of the nuclei to start nucleating
      - deltaG = free energy, whenever it is (-) that means nucleation occurs because it is going to a lower energy state
    - - Requires impurities (dislocations, grain boundaries)
      - faster than homogeneous, little supercooling
      - r* is calculated the same way as homogeneous
      - deltaG = deltaG from homogeneous nucleation multiplied by s(theta)
        
        s(theta) goes from 0 to 1
        
        0 = heterogeneous is a lot faster than homogeneous
        
        1 = heterogeneous is just as slow as homogeneous
  - - - G with a dot on top
      - Growth!!!!!