scholarly journals EBSD Analysis of Deformed and Partially Recrystallized Microstructures in ECAE-Processed Copper

2012 ◽  
Vol 715-716 ◽  
pp. 825-830 ◽  
Author(s):  
O.V. Mishin ◽  
J.R. Bowen ◽  
Andrew Godfrey
Keyword(s):  
Uniform Distribution ◽  
Room Temperature ◽  
Equal Channel Angular Extrusion ◽  
Pure Copper ◽  
Sample Thickness ◽  
Ebsd Analysis ◽  
Recrystallization Behavior ◽  
Angular Extrusion

The deformed microstructure and recrystallization behavior of copper samples processed using equal channel angular extrusion (ECAE) have been investigated. The heavily deformed microstructure was found to be non-uniform through the sample thickness and to vary in a manner consistent with the non-uniform distribution of strain imposed by processing. The through-thickness heterogeneity of the deformed microstructure resulted in a different extent of recrystallization in different layers during annealing. Recrystallized grains were also observed in samples that were not annealed, but stored at room temperature, which indicates that the deformed microstructure of ECAE-processed pure copper is unstable even at room temperature. In each sample, recrystallization was found to initiate in regions containing predominantly large misorientations.

Recrystallization Characteristics of Ti-50.9at%Ni Alloy Processed by Equal Channel Angular Extrusion

2007 ◽  
Vol 26-28 ◽  
pp. 385-388 ◽  
Author(s):  
Zhi Guo Fan ◽  
Chao Ying Xie
Keyword(s):  
High Temperature ◽  
Optical Microscopy ◽  
Equal Channel Angular Extrusion ◽  
Recrystallization Process ◽  
Recrystallization Behavior ◽  
Ni Alloy ◽  
Coarse Grains ◽  
Angular Extrusion

The initial coarse grains of Ti-50.9at%Ni alloy were refined into submicron grains, small than 0.5 um in size, after eight passes Equal Channel Angular Extrusion (ECAE) at 500°C. Optical microscopy and high temperature DSC tests were applied to investigate recrystallization behavior. It is found that the recrystallization start (Rs) and recrystallization peak (Rp) temperatures of Ti-50.9at%Ni specimens processed by eight passes ECAE are lower than that of the samples processed by one pass ECAE. Ti-50.9at%Ni specimens processed by eight passes ECAE with submicron grains are characterized by higher stability and need less energy to finish recrystallization process.

Experimental and FEM Analysis of the AA 6082 Processed by Equal Channel Angular Extrusion

2011 ◽  
Vol 478 ◽  
pp. 46-53 ◽  
Author(s):  
Javier León ◽  
C.J. Luis-Pérez ◽  
Daniel Salcedo ◽  
Ivan Pérez ◽  
Juan Pablo Fuertes ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Equal Channel Angular Extrusion ◽  
High Pressure Torsion ◽  
Fem Analysis ◽  
Fem Simulations ◽  
Roll Bonding ◽  
Angular Extrusion ◽  
Deformation Processes ◽  
Made In

Recent studies have shown that severe plastic deformation processes (SPD) improve the mechanical properties of the processed parts. Some of the most outstanding SPD processes are as follows: High Pressure Torsion (HPT), Repetitive Corrugation and Straightening (RCS), Cyclic Extrusion Compression (CEC), Accumulative Roll Bonding (ARB), Conform and Continuous Combined Drawing and Rolling (CCDR), among others, but the most well-known is Equal Channel Angular Extrusion or Pressure (ECAE/ECAP). The aim of these processes is to introduce high values of deformation inside the parts in order to reduce the grain size and thus to improve the mechanical properties of the starting material. The study of the damage imparted to an AA-6082 alloy is made in the present work. This alloy is received as cast and it is quenched at a temperature of 530 °C during 4 hours in order to be processed by ECAE at room temperature using different geometries of the dies. The imparted damage is also studied by using FEM simulations.

Microstructure and Mechanical Properties Resulting from Cold Rolling of Equal Channel Angular Extruded Commercial Purity Copper

2006 ◽  
Vol 503-504 ◽  
pp. 733-738
Author(s):  
A. Krishnaiah ◽  
Chakkingal Uday ◽  
P. Venugopal
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Cold Rolling ◽  
Equal Channel Angular Extrusion ◽  
Pure Copper ◽  
Ultrafine Grain ◽  
Ultrafine Grain Size ◽  
Ultrafine Grained ◽  
Angular Extrusion ◽  
Initial Processing

Equal channel angular extrusion (ECAE) is a processing method for introducing an ultrafine grain size into a material. In the present study, a two-step severe plastic deformation process was used to produce ultrafine grained copper with significantly enhanced strength. Equal channel angular extrusion was first used to refine the grain size of copper samples. The copper samples were further processed by cold rolling (CR) to a strain of 0.67 (about 50% reduction). This two-step process produced ultrafine grained copper with strengths higher than those of pure copper processed through ECAE only. This paper reports the microstructures and mechanical properties of the copper specimens processed by a combination of room temperature ECAE and CR. The effectiveness of initial processing by ECAE prior to cold rolling is discussed.

Evaluation of Behavior of Aluminium-CNT Composite on the Equal-Channel Angular Extrusion

2017 ◽  
Vol 899 ◽  
pp. 305-310
Author(s):  
Ariel Teixeira ◽  
Márcio Roberto da Rocha ◽  
Angela Beatriz Coelho Arnt
Keyword(s):  
Metal Matrix ◽  
Room Temperature ◽  
Equal Channel Angular Extrusion ◽  
Aluminum Matrix ◽  
Back Pressure ◽  
Matrix Composites ◽  
New Materials ◽  
Single Walled Carbon Nanotube ◽  
Materials Engineering ◽  
Angular Extrusion

Metal matrix composites (MMCs) are relatively new materials on science and materials engineering. In this work was used single-walled carbon nanotube (SWNT) as reinforcement in an aluminum matrix. For this purpose, 0.75% (by weight) of SWNT was dispersed with isopropanol using ultrasonication and mixed with particles of aluminum powder. The samples with and without SWNT were dried and compacted at room temperature with a pressure of 400 MPa for obtain a billet with 4,8x4,8x25,0 mm3. These compacted billet were subjected to Equal-Channel Angular Extrusion - ECAE (Φ=90 °) at room temperature. The influence of the presence of SWNT, of the number of extrusion passes (0, 1, and 3 passes), of the extrusion route (A or BC) and of the use of back pressure (0-65 MPa) in densification and hardness of the composite was evaluated. Optical microscopy was used to characterize the morphology of the aluminum grains, the dispersion of SWCNT and present pores in the samples. The results indicated that the density and hardness of the samples are increased with the increase in the number of extrusion passes and the use of back pressure. The microstructures showed alignment of the aluminum grains and of the CNT clusters in a direction close to the shear imposed by the ECAE process and increase of the dispersion because of the necking and defragmentation of the CNT clusters.

Evolution of Microstructure and Crystallographic Texture in AA2014 Aluminium Alloy during Equal Channel Angular Extrusion

2011 ◽  
Vol 702-703 ◽  
pp. 97-100 ◽  
Author(s):  
Sivaswamy Giribaskar ◽  
K.S. Suresh ◽  
Gouthama ◽  
Satyam Suwas
Keyword(s):  
Aluminium Alloy ◽  
Crystallographic Texture ◽  
Room Temperature ◽  
Equal Channel Angular Extrusion ◽  
Al Alloy ◽  
Microstructural Changes ◽  
Angular Extrusion ◽  
Initial Texture ◽  
Evolution Of Microstructure ◽  
2014 Al Alloy

Present work addresses the evolution of texture and microstructure of equal channel angular extrusion (ECAE) processed AA 2014 Al alloy upto four passes at room temperature by adopting route BC. TEM is used to assess the microstructural changes during each ECAE pass. Texture measurements on samples of each pass were carried out by XRD technique. The evolution of texture components after each ECAE pass are analyzed and the changes are discussed with respect to the initial texture.

scholarly journals An Analysis on the Deformation of Pure Copper during Multi-pass Equal Channel Angular Extrusion

2014 ◽  
Vol 5 ◽  
pp. 719-725 ◽  
Author(s):  
Sarthak Bhargava ◽  
Vaibhav Nigam ◽  
Kapil Arora ◽  
Ankit Sahai ◽  
Rahul S. Sharma ◽  
...  
Keyword(s):  
Equal Channel Angular Extrusion ◽  
Pure Copper ◽  
Angular Extrusion
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