Improving method for deterministic treatment of double cross-slip in FCC metals under low homologous temperatures

2021 ◽  
Vol 189 ◽  
pp. 110251
Author(s):  
Miroslav Kolář ◽  
Petr Pauš ◽  
Jan Kratochvíl ◽  
Michal Beneš
Keyword(s):  
Cross Slip ◽  
Fcc Metals ◽  
Double Cross

Orientation Dependent Strength and Cross-Slip Structure of Ordinary Dislocations in Single Crystal γ-Ti-56A1

1998 ◽  
Vol 552 ◽  
Author(s):  
Q. Feng ◽  
S. H.
Keyword(s):  
Single Crystal ◽  
High Temperatures ◽  
Slip Plane ◽  
Forward Direction ◽  
Orientation Dependence ◽  
Cross Slip ◽  
Dislocation Loops ◽  
Single Slip ◽  
Anomalous Hardening ◽  
Double Cross

ABSTRACTThe temperature as well as orientation dependence in anomalous hardening occurs in single crystal Ti-56AI between 673K and 1073K under single slip of ordinary dislocations. The ordinary dislocations (1/2<110]) are gliding not only on (111) plane but also on (110) plane in the temperature range where the anomalous hardening occurs in single crystal Ti-56A1. The TEM study shows that the (110) cross-slip of ordinary dislocations is a double cross-slip in nature in which first, the dislocations cross-slip from the primary (111) slip plane to (110) plane followed by cross-slipping again onto another primary slip plane. This double cross-slip leaves a pair of edge segments 'superjogs' in (110) planes. It appears that these superjogs are immobile in the forward direction and act as pinning points. Furthermore, these pinning points would act as a Frank-Read source for the double cross-slipped dislocations, which generate dislocation loops as well as dislocation dipoles. The pinning structure, multiplane dislocation loops, and dipoles of double cross-slip origin all contribute to anomalous hardening at high temperatures in this material.

Double cross-slip in silicon

1975 ◽  
Vol 31 (4) ◽  
pp. 961-967 ◽  
Author(s):  
Amand George ◽  
Georges Champier
Keyword(s):  
Cross Slip ◽  
Double Cross

scholarly journals Dislocation Cross-Slip in Nanocrystalline fcc Metals

2008 ◽  
Vol 100 (23) ◽  
Author(s):  
E. Bitzek ◽  
C. Brandl ◽  
P. M. Derlet ◽  
H. Van Swygenhoven
Keyword(s):  
Cross Slip ◽  
Fcc Metals

Dislocation-mediated Mechanisms of Mass Transport around Nanoindentations in Fcc Metals

2002 ◽  
Vol 738 ◽  
Author(s):  
Oscar Rodríguez de la Fuente ◽  
Esther Carrasco ◽  
Miguel A. González ◽  
Juan M. Rojo
Keyword(s):  
Mass Transport ◽  
Surface Diffusion ◽  
Dislocation Motion ◽  
Cross Slip ◽  
Dislocation Theory ◽  
Present Evidence ◽  
Fcc Metals

ABSTRACTWe present evidence for the operation on reconstructed Au(001) of a novel mechanism, involving dislocation motion, which is much more efficient than surface diffusion to redistribute mass around nanoindentations. Cross-slip of individual dislocations generated around the indentation point, with a screw component perpendicular to the surface, is shown to be responsible for the generation of multiple-storied, crystallographically-oriented terraces around the nanoindentation points. We also show that standard dislocation theory can be used to quantitatively describe the characteristics of the dislocations involved in the different processes around the nanoindentation.

The Role of Stacking Fault Energy on the Indentation Size Effect of FCC Pure Metals and Alloys

2012 ◽  
Vol 1424 ◽  
Author(s):  
D.E. Stegall ◽  
M.A. Mamun ◽  
A.A. Elmustafa
Keyword(s):  
Size Effect ◽  
Indentation Size Effect ◽  
Stacking Fault ◽  
Cross Slip ◽  
Indentation Size ◽  
Fcc Metals ◽  
Partial Dislocations ◽  
Dislocation Movement ◽  
Pure Metals ◽  
Interfacial Characteristic

ABSTRACTWe investigated the effect of stacking fault free energy (SFE), on the magnitude of the indentation size effect (ISE) of several pure FCC metals using nanoindentation. The metals chosen were 99.999% Aluminum, 99.95% Nickel, 99.95% Silver, and 70/30 Copper Zinc (α-brass). Aluminum has a high SFE of about 200 mJ/ m2, whereas α -brass has a low SFE of less than 10 mJ/ m2. Nickel and Silver have intermediate SFE of about 128 mJ/ m2 and 22 mJ/m2 respectively. The SFE is an important interfacial characteristic and plays a significant role in the deformation of FCC metals due to its influence on dislocation movement and morphology. The SFE is a measure of the distance between partial dislocations and has a direct impact on the ability of dislocations to cross slip during plastic deformation. The lower the SFE the larger the separation between partial dislocations and thus cross slip and dynamic recovery are inhibited. The SFE impacts pure metals differently from alloys. It was discovered that the characteristic ISE behavior for the pure metals was different when compared to the α-brass which is an alloy. Several additional alloys were chosen for comparison including 7075 Aluminum and 70/30 Nickel Copper.

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