scholarly journals On the strengthening and slip activity of Mg-3Al-1Zn alloy with pre-induced {101¯2} twins

2021 ◽  
Author(s):  
Jie Kuang ◽  
Yuqing Zhang ◽  
Xinpeng Du ◽  
Jinyu Zhang ◽  
Gang Liu ◽  
...  
Keyword(s):  
Slip Activity

Dislocation Substructures Produced During Tensile, Creep, and Fatigue Deformation of Ti3Al at 700°C

1977 ◽  
Vol 35 ◽  
pp. 272-273
Author(s):  
S. M. L. Sastry
Keyword(s):  
Intermetallic Compound ◽  
Strain Rate ◽  
Tensile Creep ◽  
Slip Systems ◽  
Slip Vector ◽  
Superlattice Structure ◽  
Slip Activity ◽  
Dislocation Arrangement ◽  
Ordered Intermetallic ◽  
Tangled Dislocation

Ti3Al is an ordered intermetallic compound having the DO19-type superlattice structure. The compound exhibits very limited ductility in tension below 700°C because of a pronounced planarity of slip and the absence of a sufficient number of independent slip systems. Significant differences in slip behavior in the compound as a result of differences in strain rate and mode of deformation are reported here.Figure 1 is a comparison of dislocation substructures in polycrystalline Ti3Al specimens deformed in tension, creep, and fatigue. Slip activity on both the basal and prism planes is observed for each mode of deformation. The dominant slip vector in unidirectional deformation is the a-type (b) = <1120>) (Fig. la). The dislocations are straight, occur for the most part in a screw orientation, and are arranged in planar bands. In contrast, the dislocation distribution in specimens crept at 700°C (Fig. lb) is characterized by a much reduced planarity of slip, a tangled dislocation arrangement instead of planar bands, and an increased incidence of nonbasal slip vectors.

scholarly journals Anomalous Basal Slip Activity in Zirconium under High-strain Deformation

2013 ◽  
Vol 1 (3) ◽  
pp. 133-140 ◽  
Author(s):  
Marko Knezevic ◽  
Irene J. Beyerlein ◽  
Thomas Nizolek ◽  
Nathan A. Mara ◽  
Tresa M. Pollock
Keyword(s):  
Basal Slip ◽  
High Strain ◽  
Slip Activity

Investigation on Slip Activity and Plastic Heterogeneity of Aged Mg–10Y Sheets During Compression

2021 ◽  
Author(s):  
R. Ni ◽  
Z. W. Jiang ◽  
D. D. Yin ◽  
W. Yang ◽  
H. Zhou ◽  
...  
Keyword(s):  
Slip Activity

scholarly journals Competing Deformation Mechanisms in Periclase: Implications for Lower Mantle Anisotropy

Minerals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 650 ◽  
Author(s):  
Feng Lin ◽  
Samantha Couper ◽  
Mike Jugle ◽  
Lowell Miyagi
Keyword(s):  
Lower Mantle ◽  
Seismic Anisotropy ◽  
Shear Velocity ◽  
Deformation Mechanisms ◽  
Effect Of Temperature ◽  
Lattice Strains ◽  
Slip Activity ◽  
Consistent Method ◽  
Mantle Anisotropy ◽  
Low Shear

Seismic anisotropy is observed above the core-mantle boundary in regions of slab subduction and near the margins of Large Low Shear Velocity Provinces (LLSVPs). Ferropericlase is believed to be the second most abundant phase in the lower mantle. As it is rheologically weak, it may be a dominant source for anisotropy in the lowermost mantle. Understanding deformation mechanisms in ferropericlase over a range of pressure and temperature conditions is crucial to interpret seismic anisotropy. The effect of temperature on deformation mechanisms of ferropericlase has been established, but the effects of pressure are still controversial. With the aim to clarify and quantify the effect of pressure on deformation mechanisms, we perform room temperature compression experiments on polycrystalline periclase to 50 GPa. Lattice strains and texture development are modeled using the Elasto-ViscoPlastic Self Consistent method (EVPSC). Based on modeling results, we find that { 110 } ⟨ 1 1 ¯ 0 ⟩ slip is increasingly activated with higher pressure and is fully activated at ~50 GPa. Pressure and temperature have a competing effect on activities of dominant slip systems. An increasing { 100 } ⟨ 011 ⟩ : { 110 } ⟨ 1 1 ¯ 0 ⟩ ratio of slip activity is expected as material moves from cold subduction regions towards hot upwelling region adjacent to LLSVPs. This could explain observed seismic anisotropy in the circum-Pacific region that appears to weaken near margins of LLVSPs.

Modeling Compression and Tension Reloads in Copper Prestrained by Rolling

2007 ◽  
Vol 539-543 ◽  
pp. 3383-3388 ◽  
Author(s):  
Irene J. Beyerlein ◽  
Carlos N. Tomé
Keyword(s):  
Flow Stress ◽  
Constitutive Model ◽  
Single Crystal ◽  
Strain Path ◽  
Transverse Direction ◽  
Flow Curves ◽  
Hardening Law ◽  
Slip Activity ◽  
Directional Anisotropy ◽  
Planar Dislocation

A constitutive model is applied to predict the flow stress of an fcc material up to 30% straining after rolling to reductions of 19%, 39%, and 50%. The model makes use of a single crystal hardening law which appreciates the directional anisotropy produced by planar dislocation boundaries, Bauschinger effects, and dissolution of substructure by new slip activity invoked by changes in strain path. Anisotropy between axial testing in the rolling (RD) versus the transverse direction (TD) and a tensioncompression stress- differential in RD are predicted. These and other characteristics of the flow curves are linked to changes in slip activity when deformation transitions from rolling to axial testing.

A Comparison of Flow Stress and Microstructure Development of Al Alloys in Plane Strain Compression and Multiple Forging

2006 ◽  
Vol 519-521 ◽  
pp. 979-984
Author(s):  
S. Ringeval ◽  
Julian H. Driver
Keyword(s):  
Plane Strain ◽  
Al Alloys ◽  
Plane Strain Compression ◽  
Microstructure Development ◽  
Initial Sample ◽  
Slip Activity ◽  
Sample Shape ◽  
Deformation Modes ◽  
Bulk Alloys ◽  
Activity Behaviour

Multiple forging (MF) can be used to attain large plastic strains in bulk alloys by successive forging along three orthogonal directions to retain the initial sample shape. An original multiple forging technique enabling 3-D cross forging at constant temperature up to 500°C has been applied to two Al alloys (Al-1%Mn and Al-3%Mg-Sc,Zr). Their rheology, texture and microstructure evolution are compared with those obtained in plane strain compression (PSC). The results are interpreted in terms of slip activity behaviour during both deformation modes. They can also be correlated with the contributions of free dislocations and sub-boundaries.

Study of Microstructure and Texture Evolution Using In-Situ EBSD Investigations and SE Imaging in SEM

2006 ◽  
Vol 519-521 ◽  
pp. 809-814 ◽  
Author(s):  
Hans Bjerkaas ◽  
Snorre Kjørstad Fjeldbo ◽  
Hans Jørgen Roven ◽  
Jarle Hjelen ◽  
Rémi Chiron ◽  
...  
Keyword(s):  
Texture Evolution ◽  
Initial Orientation ◽  
Lattice Rotation ◽  
Complex Nature ◽  
Texture Gradient ◽  
Slip Activity ◽  
Crystallographic Slip ◽  
Simple Tension ◽  
Grain Orientations

The crystallographic slip activity in several grains deformed by simple tension is determined by use of in-situ deformation in combination with Electron Back Scattering Diffraction (EBSD)-investigations and Secondary Electron (SE) imaging. This technique is also used to determine grain lattice rotation paths of grains with different initial orientation, providing information on basic deformation mechanisms of grains present in texture gradients. Both slip activity and grain lattice rotation paths depend on the initial orientation and are influenced by the neighbouring grain orientations. This indicates that predictions of the forming behaviour of extruded profiles with a strong through thickness texture gradient relate to a very complex nature.

Grain to grain slip activity in plastically deformed Zr determined by X-ray micro-diffraction line profile analysis

2007 ◽  
Vol 55 (3) ◽  
pp. 1117-1127 ◽  
Author(s):  
T. Ungár ◽  
O. Castelnau ◽  
G. Ribárik ◽  
M. Drakopoulos ◽  
J.L. Béchade ◽  
...  
Keyword(s):  
Line Profile ◽  
Profile Analysis ◽  
Diffraction Line ◽  
Line Profile Analysis ◽  
X Ray ◽  
Diffraction Line Profile ◽  
Slip Activity
Sign in / Sign up

Export Citation Format

Share Document