High angle boundary formation by grain subdivision in equal channel angular extrusion

2004 ◽  
Vol 51 (6) ◽  
pp. 565-570 ◽  
Author(s):  
P.L. Sun ◽  
P.W. Kao ◽  
C.P. Chang
Keyword(s):  
Equal Channel Angular Extrusion ◽  
High Angle Boundary ◽  
High Angle ◽  
Boundary Formation ◽  
Angular Extrusion

Characterization of Boundary Misorientations in a Superplastic Al-Alloy Hot-Deformed by ECAE

2007 ◽  
Vol 550 ◽  
pp. 295-300 ◽  
Author(s):  
O.V. Mishin ◽  
Andrew Godfrey
Keyword(s):  
Equal Channel Angular Extrusion ◽  
Al Alloy ◽  
High Angle ◽  
Deformation Structures ◽  
Angular Extrusion ◽  
Zr Alloy

Microstructure and boundary populations were investigated in a superplastic Al-5.5%Mg- 2.2%Li-0.12%Zr alloy hot-deformed by equal channel angular extrusion. The microstructure was found to be inhomogeneous and revealed deformation structures being subdivided by both low- and high-angle boundaries.

Microstructure Evolution and Mechanical Properties of Mg Alloy AZ31D Processed by Equal Channel Angular Extrusion

2007 ◽  
Vol 551-552 ◽  
pp. 651-656
Author(s):  
Yan Shu Zhang ◽  
Zhi Peng Zeng ◽  
X.F. Liu ◽  
Quan Lin Jin
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Microstructure Evolution ◽  
Equal Channel Angular Extrusion ◽  
Processing Temperature ◽  
Maximum Elongation ◽  
High Angle ◽  
Angular Extrusion ◽  
Elongation To Failure

The microstructure evolution and mechanical properties of magnesium alloy AZ31D processed by equal channel angular extrusion(ECAE) are studied. The processing temperature and the passes of extrusion are important factors to affect the microstructure and mechanical properties of the magnesium alloy during ECAE. In this paper, ECAE was performed at the temperature from 523 to 673K. The ductility increased through the grain refinement after the ECAE because the recrystallization took place and high angle grain boundary formed. The elongation of magnesium alloys AZ31D was improved after the ECAE. The maximum elongation-to-failure of magnesium alloys AZ31D processed by ECAE for 4 passes at 573K and strain rate of 0.5 10−4 s−1 × was 350%.

The Effect of Strain on the Development of Ultra-Fine Grain Structure in 7055 Aluminium Alloy Processed by Equal Channel Angular Extrusion

2008 ◽  
Vol 584-586 ◽  
pp. 691-696 ◽  
Author(s):  
Ilya Nikulin ◽  
Yoshinobu Motohashi ◽  
Rustam Kaibyshev
Keyword(s):  
Grain Boundaries ◽  
Equal Channel Angular Extrusion ◽  
Grain Structure ◽  
High Angle ◽  
Continuous Dynamic Recrystallization ◽  
Fine Grain ◽  
Average Grain Size ◽  
Angular Extrusion ◽  
Continuous Dynamic ◽  
7055 Aluminum Alloy

Grain refinement taking place in a commercial 7055 aluminum alloy under equal channel angular extrusion at a temperature of 250°C, was examined. The material was deformed up to a total strain, ε, of ~12. At ε≈1, the development of subgrain bands was found. Upon further straining the average misorientation of deformation-induced boundaries increases; low-angle grain boundaries (LAGBs) gradually convert into true high-angle grain boundaries (≥15°) (HAGBs). At ε≈4, a structure consisting of boundaries with low and high angle misorientations was observed. At ε≈12, a structure with an average grain size of ∼0.7 µm was formed. This size is roughly similar to that for subgrains developed at preceding strains. It was shown that the formation of submicrocrystalline grains occurs through continuous dynamic recrystallization both along initial boundaries and within interiors of original grains as well.

Microstructure and Texture Evolution during Equal Channel Angular Extrusion of Pure Copper: Effect of Strain Rat

2011 ◽  
Vol 239-242 ◽  
pp. 472-476
Author(s):  
Guo Ping Zhang
Keyword(s):  
Equal Channel Angular Extrusion ◽  
Texture Evolution ◽  
Pure Copper ◽  
High Angle Boundary ◽  
Deformation Structure ◽  
High Angle ◽  
Fine Grain ◽  
Transmission Electron ◽  
Electron Back Scattered Diffraction ◽  
Copper Effect

Effect of strain velocity on the refinement of severe plastic deformation structure of ECA pressed pure copper was studied using transmission electron microscope(TEM) and electron back-scattered diffraction (EBSD) analysis. Formation mechanism of unltra-fine grain with high angle boundary was discussed. It was found that exceedingly fast stain rate can significantly increase the fraction of high angle boundary, up to 76%, and make grain refine further, up to 0.23μm.

Analysis of texture evolution in equal channel angular extrusion of copper using a new flow field

2004 ◽  
Vol 52 (7) ◽  
pp. 1885-1898 ◽  
Author(s):  
László S. Tóth ◽  
Roxane Arruffat Massion ◽  
Lionel Germain ◽  
Seung C. Baik ◽  
Satyam Suwas
Keyword(s):  
Flow Field ◽  
Equal Channel Angular Extrusion ◽  
Texture Evolution ◽  
Angular Extrusion

Tube Equal Channel Angular Extrusion (tECAE) of Mg-3Al-1Zn alloy

2021 ◽  
pp. 141236
Author(s):  
Abhinav Srivastava ◽  
Matthew W. Vaughan ◽  
Bilal Mansoor ◽  
Wahaz Nasim ◽  
Robert Barber ◽  
...  
Keyword(s):  
Equal Channel Angular Extrusion ◽  
Angular Extrusion

Shear induced simultaneous consolidation and alignment of silicon nanowires into ingots using equal channel angular extrusion (ECAE)

2015 ◽  
Vol 2 (1) ◽  
pp. 015013 ◽  
Author(s):  
Venkata Vasiraju ◽  
Lance Brockway ◽  
Shreyas Balachandran ◽  
Arun Srinivasa ◽  
Sreeram Vaddiraju
Keyword(s):  
Silicon Nanowires ◽  
Equal Channel Angular Extrusion ◽  
Angular Extrusion

Mechanical Properties of Equal-Channel Angular Extrusion-Processed Al-20Zn Alloy

2012 ◽  
Vol 445 ◽  
pp. 195-200
Author(s):  
Murat Aydin ◽  
Yakup Heyal
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
Equal Channel Angular Extrusion ◽  
Considerable Change ◽  
Fatigue Properties ◽  
Dendritic Microstructure ◽  
Two Phase ◽  
Angular Extrusion ◽  
Alloy Increase ◽  
The Impact

The mechanical properties mainly tensile properties, impact toughness and high-cycle fatigue properties, of two-phase Al-20Zn alloy subjected to severe plastic deformation (SPD) via equal-channel angular extrusion (ECAE) using route A up to 2 passes were studied. The ECAE almost completely eliminated as-cast dendritic microstructure including casting defects such as micro porosities. A refined microstructure consisting of elongated micro constituents, α and α+η eutectic phases, formed after ECAE via route A. As a result of this microstructural change, mechanical properties mainly the impact toughness and fatigue performance of the as-cast Al-20Zn alloy increased significantly through the ECAE. The rates of increase in fatigue endurance limit are approximately 74 % after one pass and 89 % after two passes while the increase in impact toughness is 122 %. Also the yield and tensile strengths of the alloy increase with ECAE. However, no considerable change occurred in hardness and percentage elongation of the alloy. It was also observed that the ECAE changed the nature of the fatigue fracture characteristics of the as-cast Al-20Zn alloy.

Sign in / Sign up

Export Citation Format

Share Document