The evolution of the mobile dislocation density during successive stress relaxation transients

2008 ◽  
Vol 483-484 ◽  
pp. 203-206 ◽  
Author(s):  
R. Bonadé ◽  
P. Spätig
Keyword(s):  
Stress Relaxation ◽  
Dislocation Density ◽  
Mobile Dislocation ◽  
Mobile Dislocation Density

The creation rate of mobile dislocation density in a creep experiment

1986 ◽  
Vol 20 (8) ◽  
pp. 1075-1078 ◽  
Author(s):  
J.A. Montemayor-Aldrete ◽  
J. Soullard ◽  
R. Gómez-Ramírez ◽  
A. Calles
Keyword(s):  
Dislocation Density ◽  
Mobile Dislocation ◽  
Mobile Dislocation Density ◽  
Creep Experiment ◽  
The Creation ◽  
Creation Rate

The Influence of Mobile Dislocation Density on the Fracture Toughness of B2-Based Ni-Fe-Al Alloys

1994 ◽  
Vol 350 ◽  
Author(s):  
A. Misra ◽  
R. D. Noebe ◽  
R. Gibala
Keyword(s):  
Fracture Toughness ◽  
Dislocation Density ◽  
Tensile Ductility ◽  
Growth Direction ◽  
Mobile Dislocation ◽  
Second Phase ◽  
Mobile Dislocation Density ◽  
Dislocation Generation ◽  
Multiphase Materials ◽  
Β Phase

AbstractThe deformation and fracture behaviors of two directionally solidified multi-phase Ni-Fe-Al ordered alloys were investigated. One alloy consisted of continuous β+γ lamellae with fine γ precipitates within the γ phase. The NiAl-based β phase of this alloy exhibited <100> slip even when deformed parallel to the [001] growth direction. This material exhibited an initiation fracture toughness of ∼ 30 MPa √m and tensile ductility of 10%. The second alloy consisted of aligned but discontinuous γ lamellae within a continuous β phase. Again, the γ phase contained γ precipitates, but unlike the previous alloy, the β phase also contained a fine dispersion of bcc precipitates due to spinodal decomposition. The β phase of this alloy deformed by <111> slip. This four-phase alloy exhibited a fracture toughness of ∼ 21 MPa √m and tensile ductility of 2%. Observations of the plastic zone in both alloys indicated significant plasticity in the β phase due to easy slip transfer from the ductile second phase. The enhanced fracture resistance of these multiphase materials compared to single phase β alloys is attributed in large part to intrinsic toughening of the β phase by an increased mobile dislocation density due to efficient dislocation generation from the β/γ interfaces.

A consideration of mobile dislocation density

1978 ◽  
Vol 12 (9) ◽  
pp. 753-757 ◽  
Author(s):  
S. Raghuraman ◽  
R.J. Arsenault
Keyword(s):  
Dislocation Density ◽  
Mobile Dislocation ◽  
Mobile Dislocation Density
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