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Diffusion Mechanisms & Phase Diagrams: Movement of atoms and molecules…

- - - - Case Hardening of Gears
        
        Depth of Case
        
        Time
        
        Temperature
        
        Constituents
        
        Surface layer of regulated depth (can analyse carbon penetration level)
  - - - Lattice to vacancy
    - - Jump between intersitial sites
    - - 1) Temperature
        
        Makes it higher
        
        Example
      - 2) Host Material
        
        Crystal Structure
        
        More open structure diffuses more
      - 3) Diffusing Species
        
        Small Atoms diffuse faster than larger ones
      - Less grain boundaries then diffuses faster
- - - - Homogenous body of matter with uniform physical and chemical
      - 3 phases
        
        liquid
        
        gas
        
        Phase Transformations
        
        change in
        
        Temperature
        
        Pressure
        
        Composition
        
        Phase Diagrams
        
        Binary Isomorphous
        
        Cu-Ni
        
        5 more items...
        
        Eutoctoid
        
        Eutectic
        
        Intermediate/INtermetallic
        
        & Microstructure
        
        Determines Mechanical Properties
        
        1 more item...
        
        solid
        
        Differentiated by Greek alphabet
    - - unlimited
      - limited
      - no
      - Solubility in Alloys
        
        solid alloys have varying solubility
        
        What affects solubility limits in alloys?
        
        Atomic Size
        
        Crystal Strucutre
        
        More than one
        
        Allotropy
        
        Valence of components
        
        Electronegativity