Texture Evolution in Equal‐Channel Angular Extrusion

Beyerlein, Irene J.; Tth, Lszl S.

doi:10.1002/9783527626892.ch18

Cited by 10 publications

(18 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ECAP textures after one pass that can be well described are essentially the same for all three material conditions in terms of the {111} a //SP a-fiber and the h110i a //SD b-fiber with nearly the same intensity (see Fig. 11) [26]. It is known [26] that these two fibers are connected at the A h and "…”

Section: Microstructural Evolution In the Quenched Alloymentioning

confidence: 93%

“…2a, 7a and 9a matches these ideal positions (see Fig. 11) with some deviations, which is termed ''tilts'' [26]. The main feature of the ECAP texture is the formation of marked c-fibers, which are defined as a line of / = 54.74 o , u 1 = 0-360 o , u 2 = 45 o in Euler space (see Fig.…”

Section: Microstructural Evolution In the Quenched Alloymentioning

confidence: 97%

“…The {111} a pole figures reconstructed from the ODFs are presented in Fig. 11, where the main ideal orientations associated with simple shear in a single ECAP pass [26] are also shown to describe the textural characteristics. In Fig.…”

Section: Microstructural Evolution In the Quenched Alloymentioning

confidence: 99%

“…The main feature of the ECAP texture is the formation of marked c-fibers, which are defined as a line of / = 54.74 o , u 1 = 0-360 o , u 2 = 45 o in Euler space (see Fig. 10) and consist of B/ " B textural components with a simple shear texture for FCC materials [26][27][28]. The c-fiber represents the {112} h111i orientation, which is fact copper components associated with the simple shear deformation of FCC materials [26,29,30].…”

Section: Microstructural Evolution In the Quenched Alloymentioning

confidence: 99%

See 3 more Smart Citations

The effect of second-phase particles on grain refinement during equal-channel angular pressing in an Al–Cu–Mg–Ag alloy

2014

View full text Add to dashboard Cite

In this work, the effect of second-phase particle distributions on grain refinement during equal-channel angular pressing (ECAP) was studied at 250°C by comparing the microstructural evolution in an Al-Cu-Mg-Ag alloy processed in three different states. The first state (QA) was obtained by water quenching, and the second state was obtained by overaging at 250°C. Both these states contain fine dispersions of X-phase shearable plates with coherent and/or semi-coherent interfaces. The QA plate thickness prior to ECAP was higher by a factor of four than in the OA. The third alloy (HA) contained relatively coarse non-deformable particles of thermodynamically equilibrium phases with incoherent interfaces. It was shown that distribution of the secondary phase particles strongly affects the continuous dynamic recrystallization through the initial formation of geometrically necessary boundaries (GNBs), pinning dislocations and deformationinduced boundaries. The formation of a fully recrystallized structure occurs at the highest rate in the HA material with rounded grains because of 3D networks of low-angle boundaries (LABs) evolve at e * 1 due to the concurrent formation of GNBs belonging to two families. In the QA and OA materials, the shearing of the X-phase plates with the coherent interfaces leads to the strong localization of dislocation slip and the dominant formation of one family of GNBs. Nonshearable nanoscale dispersoids hinder the formation of 3D arrays for GNBs. As a result, only a partially recrystallized structure evolves, even at strains of up to e * 12.

show abstract

Section: Microstructural Evolution In the Quenched Alloymentioning

confidence: 93%

Section: Microstructural Evolution In the Quenched Alloymentioning

confidence: 97%

Section: Microstructural Evolution In the Quenched Alloymentioning

confidence: 99%

Section: Microstructural Evolution In the Quenched Alloymentioning

confidence: 99%

See 2 more Smart Citations

The effect of second-phase particles on grain refinement during equal-channel angular pressing in an Al–Cu–Mg–Ag alloy

2014

View full text Add to dashboard Cite

show abstract

“…The Some investigations show that the grain refinement in repetitive shears is mainly established during the first pass (Ref 34,35). Therefore, to achieve the maximum plastic deformation in the first pass, the equivalent elongation strain e tends to be the maximum value.…”

Section: Geometric Equivalence Of Mcte Processmentioning

confidence: 98%

Micro-structural Evolution in Metals Subjected to Simple Shear by a Particular Severe Plastic Deformation Method

et al. 2015

J. of Materi Eng and Perform

View full text Add to dashboard Cite

Simple shear (SS) has been considered an optimal deformation method of severe plastic deformation (SPD). To achieve SS, a particular SPD method known as mutative channel torsion extrusion (MCTE) was designed based on the geometric equivalence of SS, and the cavity parameters of a die were calculated according to strain equivalence. To investigate the characteristics of micro-structural evolution subjected to MCTE, simulated and experimental investigations were conducted. The simulated results indicate that equivalent strain distribution on the cross section is relatively uniform, and the metallographic observations confirm the simulated phenomenon. Transmission electron microscopy investigations show that the process of grain refinement undergoes the formation of shear bands, dislocation cells, dislocation forests, largeangle grain boundaries, and recrystallization nuclei. Two types of mechanisms are proposed in view of the different effects of SS on grain refinement. Eventually, MCTE is ensured as an effective method for grain refinement.

show abstract