Question

Consider the following face-centred-cubic dislocation reaction:

text-II 101-101,

1. Prove that the reaction can occur.
2. What kind of dislocations are the (a/6)<121>?
3. What kind of crystal imperfection results from this dislocation reaction?
4. What determines the distance of separation of the (a/6)[2-1-1] and the (a/6)[121]?

Answer 1

Given, The face - centered -cubic dislocation reaction [107] -[a i i] + [112] # The chance of the reaction is the dislocation as [107] with → dislocate into two shockly partial dislocations a Cail] and as[la] is subject to if the sum of elastic energy of the grad dislocations is lower than the elastic energy of the original cube Nows, the energy of the dislocation can be written as E= 2062 There fore, ()* Helmssap 1 +692 +2)+4+2+46)2 +(2) Scanned with CamScanner

As Y >%, the reaction will occur *- % elals are partial dislocations *-> Stacking fault results from this dislocation reaction, yeo Scanned with CamScanner