Hi sir. 1.On what basis we can say that recrystallization will form finer recrystallised grains if degree of prior deformation is more. 2. In the definition it was mentioned as replacement of deformed crystal of high dislocation density. But we are speaking about nucleation in the further points, does that mean recrystallization as nucleation of dislocation free grains. 3. What is the actual mechanism of Recrystallization sir?
@introductiontomaterialsscience4 жыл бұрын
More the prior deformation more is the driving force for recrystallisation. Yes, recrystallisation happens with nucleation of stress-free grains in strained crystal.
@eylulZZ4 жыл бұрын
Sir, I didn't understand the effect of solute atoms on recrystallization temperature - why do grain boundaries move during recrystallization?
@introductiontomaterialsscience4 жыл бұрын
Recrystallization process involves the nucleation of strain-free (or dislocation free) grains and their subsequent growth in the unrecrystallized matrix. This process involves the movement of the grain boundary between the recrystallized and the unrecrystallized grains.
@thinkpositive29945 жыл бұрын
super explaination ..thank you...sir..
@mdfaiyazahmad93313 жыл бұрын
Sir, you said Driving force: strain energy associated with dislocations. Does that mean Gibbs free energy associated with lower dislocation density will be greater than gibbs free energy associated with higher dislocation density?
@introductiontomaterialsscience3 жыл бұрын
No, it is the other way round.
@13-ahmedmohamedhassan735 жыл бұрын
in recrystallization do annealing twins form and if they are formed ,in what structure
@Sumitkumar-el8xc5 жыл бұрын
Best possible explanation sir ...thanks
@makwanamilan73543 жыл бұрын
Sir why temp is exponential depends on recristalization.
@tarahman79 ай бұрын
Thanks a lot sir
@AhmedHAhmed-bk3om4 жыл бұрын
What causes recrystallization? In energy
@chandraprakash9344 жыл бұрын
I also have the same question. Can recrystallisation occur on its own ?
@shinshin6595 Жыл бұрын
energy stored in higher density dislocations, or strain energy associated with dislocation
@satveerpal75323 жыл бұрын
Hi sir I didn't understand the effect of recrystallization on tensile strength. How does tensile strength decreases with recrystallization?
@introductiontomaterialsscience3 жыл бұрын
The decrease in strength is due to reduction of strain hardening due to decrease in dislocation density.
@makwanamilan73543 жыл бұрын
Because due to grain growth the course grain form and it is easy to deform . So tensile strength decrease
@SaiRam-vp8yn3 жыл бұрын
Sir how cold working at lower temperature will have higher strain energy than at more temperatures.. Pls explain...
@rajeshprasadlectures3 жыл бұрын
At higher temperatures, there are mechanisms by which dislocations and other defects can be annihilated. Thus strain energy associated with these defects is reduced.
@SaiRam-vp8yn3 жыл бұрын
@@rajeshprasadlectures thank you sir for the explanation
@kidusbahiru43694 жыл бұрын
Is recrystallization a martenistic or a nucleation growth driven phase transformation ?
@introductiontomaterialsscience4 жыл бұрын
During recrystallization no change of phase takes place. Strain free crystals form from the strained crystals of the same phase. so strictly speaking it is not an even a phase transformation. So it is microstructural transformation without any phase change. The mechanism of transformation is like nucleation and growth. Thus the rate of transformation depends on temperature. It is not martensitic where the rate is independent of transformation.