Dislocation Density Effects on Annealing Twin Nucleation and Recrystallization Mechanism Activation

2021 ◽  
Author(s):  
Asher Calvin Leff
Keyword(s):  
Dislocation Density ◽  
Annealing Twin ◽  
Density Effects ◽  
Recrystallization Mechanism ◽  
Twin Nucleation

Modeling grain size and dislocation density effects on harmonics of the magnetic induction

2001 ◽  
Vol 89 (11) ◽  
pp. 7254-7256 ◽  
Author(s):  
M. J. Sablik ◽  
D. Stegemann ◽  
A. Krys
Keyword(s):  
Grain Size ◽  
Dislocation Density ◽  
Magnetic Induction ◽  
Density Effects

scholarly journals Observation of annealing twin nucleation at triple lines in nickel during grain growth

2015 ◽  
Vol 99 ◽  
pp. 63-68 ◽  
Author(s):  
B. Lin ◽  
Y. Jin ◽  
C.M. Hefferan ◽  
S.F. Li ◽  
J. Lind ◽  
...  
Keyword(s):  
Grain Growth ◽  
Annealing Twin ◽  
Twin Nucleation

Observations of dislocation interactions with recrystallized grain boundaries

1988 ◽  
Vol 46 ◽  
pp. 628-629
Author(s):  
C. W. Price
Keyword(s):  
Dislocation Density ◽  
Grain Boundary ◽  
Strain Rate ◽  
Grain Boundaries ◽  
Dislocation Structure ◽  
Hot Deformation ◽  
Static Recrystallization ◽  
High Dislocation Density ◽  
High Angle ◽  
Dislocation Interactions

Little evidence exists on the interaction of individual dislocations with recrystallized grain boundaries, primarily because of the severely overlapping contrast of the high dislocation density usually present during recrystallization. Interesting evidence of such interaction, Fig. 1, was discovered during examination of some old work on the hot deformation of Al-4.64 Cu. The specimen was deformed in a programmable thermomechanical instrument at 527 C and a strain rate of 25 cm/cm/s to a strain of 0.7. Static recrystallization occurred during a post anneal of 23 s also at 527 C. The figure shows evidence of dissociation of a subboundary at an intersection with a recrystallized high-angle grain boundary. At least one set of dislocations appears to be out of contrast in Fig. 1, and a grainboundary precipitate also is visible. Unfortunately, only subgrain sizes were of interest at the time the micrograph was recorded, and no attempt was made to analyze the dislocation structure.

Investigation of shock-wave deformation history from recovered structure

1986 ◽  
Vol 44 ◽  
pp. 434-435
Author(s):  
M.A. Mogilevsky ◽  
L.S. Bushnev
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Dislocation Density ◽  
Shock Waves ◽  
Shock Front ◽  
Single Crystals ◽  
Residual Deformation ◽  
Deformation Structure ◽  
Deformation History ◽  
Deformation Velocity

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.

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