eg_phase diagrams by Purna_Yalamanchili

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									Plotting of Equilibrium Diagrams

  Cooling curve for a pure metal
Cooling curves for pure metals and alloys




      A   B
1.Isomorphous system
4.Layer type systems
     Transformation In Alloy Systems
S.NO Name of          Transformation           Examples
     transformation   Characteristic
1.   Allotropy        Solid A Solid B         In pure metals
                                               such as Fe, Sn,
                                               Co, Cr.
2.   Eutectoid        Solid A Solid B+Solid   Fe-C, Cu-Sn,
                      C                        Cu-Al
                      Liquid Solid A+ Solid   Fe-C, Al-Si, Bi-
3.   Eutectic                                  Cd
                      B
                      Solid A+ Solid B        Ni-Zn, Cu-Sn,
4.   Peritectoid                               Ni-Mo.
                      Solid C

5.   Peritectic                                Fe-C, Cu-Zn,
                      Liquid+ Solid A Solid
                      B                        Pt-Ag
6.   Monotectic       Liquid A Liquid B +     Al-Pb, Cu-Pb,
                      Solid                    Cu-Cr
7.   Order-Disorder   Disordered Structure
                      Ordered Structure       Cu-Zn, Au-Cu
    Transformations in alloy systems
     1.Monotectic Transformation

                                           L
                 L1


         Cu+L1                     L1+L2
T                                              L2
e
m
p
                       Cu+L2



                        Cu+Pb


    Cu                                              Pb
                       Wt % of B
                                                                           T4

                               L                         L+ε
                                             I       J
                                                               K
T                                  G     L+δ
e T3
         L+β     E
                     L+β
                               F
                                                                   ε
                                       β+δ
m                                       γ+δ
             β             D       H                      δ+ε
p
                                                 δ
  T2                 β+γ
       α+β                         γ
  T1
             C
                 α+γ
   A                                                                   B

               Composition % B
Al-Cu

								
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