scholarly journals First-principles investigation of strain effects on the stacking fault energies, dislocation core structure, and Peierls stress of magnesium and its alloys

2017 ◽  
Vol 95 (22) ◽  
Author(s):  
S. H. Zhang ◽  
I. J. Beyerlein ◽  
D. Legut ◽  
Z. H. Fu ◽  
Z. Zhang ◽  
...  
Keyword(s):  
First Principles ◽  
Dislocation Core ◽  
Stacking Fault ◽  
Core Structure ◽  
Peierls Stress ◽  
Strain Effects ◽  
Dislocation Core Structure ◽  
Stacking Fault Energies

Dislocation core structure and motion in pure titanium and titanium alloys: A first-principles study

2022 ◽  
Vol 203 ◽  
pp. 111081
Author(s):  
Tomohito Tsuru ◽  
Mitsuhiro Itakura ◽  
Masatake Yamaguchi ◽  
Chihiro Watanabe ◽  
Hiromi Miura
Keyword(s):  
Titanium Alloys ◽  
First Principles ◽  
Pure Titanium ◽  
Dislocation Core ◽  
Core Structure ◽  
First Principles Study ◽  
Structure And Motion ◽  
Dislocation Core Structure

Dislocation Core Structure and Peierls Stress of B2-Based AlSc in {110} Plane

2016 ◽  
Vol 45 (10) ◽  
pp. 5024-5032
Author(s):  
S. R. Li ◽  
X. Z. Wu ◽  
T. Zhang ◽  
Y. X. Tian ◽  
Z. X. Yan ◽  
...  
Keyword(s):  
Dislocation Core ◽  
Core Structure ◽  
Peierls Stress ◽  
Dislocation Core Structure

The effect of shear stress on the screw dislocation core structure in body-centred cubic lattices

1973 ◽  
Vol 332 (1588) ◽  
pp. 85-111 ◽  
Keyword(s):  
Shear Stress ◽  
Screw Dislocation ◽  
Plastic Flow ◽  
Stacking Faults ◽  
Dislocation Core ◽  
Stacking Fault ◽  
Core Structure ◽  
Cubic Lattices ◽  
The Core ◽  
Dislocation Core Structure

The behaviour of the ½ a <111> screw dislocation core in the presence of an external shear stress on {110} planes has been studied for a variety of effective interionic potentials, each representing a stable b. c. c. lattice. The distortion and motion of the core are described using the concept of fractional dislocations, which are imperfect dislocations bounding a ribbon of generalized (unstable) stacking fault. Three essentially distinct types of movement are found, and the relation of these to plastic flow and twinning in real b. c. c. metals is discussed. It is found that the movement of the dislocation core can be rationalized in terms of the relative stresses needed to create generalized stacking faults on {110} and {112} planes.

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