Application of Equal-Channel Angular Pressing to Aluminum and Copper Single Crystals

2007 ◽  
Vol 539-543 ◽  
pp. 2853-2858 ◽  
Author(s):  
Minoru Furukawa ◽  
Z. Horita ◽  
Terence G. Langdon
Keyword(s):  
Electron Microscopy ◽  
Single Crystals ◽  
Equal Channel Angular Pressing ◽  
Orientation Imaging Microscopy ◽  
Orientation Imaging ◽  
Angular Pressing ◽  
Transmission Electron ◽  
High Purity Aluminum ◽  
Copper Single Crystals ◽  
Crystallographic Orientations

This paper describes experiments in which high purity aluminum (Al) and copper (Cu) single crystals of different crystallographic orientations were processed for one pass by equal-channel angular pressing (ECAP). The deformed structures were examined using optical microscopy (OM), orientation imaging microscopy (OIM) and transmission electron microscopy (TEM). The results for Al single crystals are compared with those for Cu single crystals.

Microstructures of Aluminum and Copper Single Crystals Processed by Equal-Channel Angular Pressing

2010 ◽  
Vol 638-642 ◽  
pp. 1946-1951 ◽  
Author(s):  
Minoru Furukawa ◽  
Z. Horita ◽  
Terence G. Langdon
Keyword(s):  
Single Crystals ◽  
Equal Channel Angular Pressing ◽  
Orientation Imaging Microscopy ◽  
Orientation Imaging ◽  
Angular Pressing ◽  
Transmission Electron ◽  
Shear Theory ◽  
High Purity Aluminum ◽  
Copper Single Crystals ◽  
Shear Factors

High purity aluminum (Al) and copper (Cu) single crystals of different crystallographic orientations were processed for one pass by equal-channel angular pressing (ECAP). The deformed structures were examined using orientation imaging microscopy (OIM) and transmission electron microscopy (TEM). This paper examines the experimental results in terms of the values of the shear factors based on simple shear theory.

An Investigation of Deformation in Copper Single Crystals Using Equal-Channel Angular Pressing

2006 ◽  
Vol 503-504 ◽  
pp. 113-118 ◽  
Author(s):  
Minoru Furukawa ◽  
Yukihide Fukuda ◽  
Keiichiro Oh-ishi ◽  
Z. Horita ◽  
Terence G. Langdon
Keyword(s):  
Single Crystals ◽  
Equal Channel Angular Pressing ◽  
Slip Plane ◽  
Orientation Imaging Microscopy ◽  
Shear Plane ◽  
Initial Orientation ◽  
Shear Direction ◽  
Slip Direction ◽  
Angular Pressing ◽  
Copper Single Crystals

This paper describes experiments in which high purity copper single crystals of two different orientations were processed for one pass by equal-channel angular pressing (ECAP) and the deformed structures were examined using optical microscopy (OM), orientation imaging microscopy (OIM) and transmission electron microscopy (TEM). The first single crystal (0° specimen) was oriented within the entrance channel of the die so that the {111} slip plane and the <110> slip direction were parallel to the theoretical shear plane and shear direction, respectively. The second crystal (20° specimen) was oriented with the {111} slip plane and the <110> slip direction rotated by 20° in a clockwise sense from the theoretical shear plane and shear direction, respectively. For the 0° specimen, after passing through the shear plane there were two crystallographic orientations representing the initial orientation and an orientation rotated by 60° in a counter-clockwise sense from the initial orientation. For the 20° specimen, there was an orientation rotated by 20° in a counter-clockwise sense from the initial orientation after passing through the shear plane.

Deformation Structure and Crystal Orientation of Copper Single Crystals Deformed by Equal Channel Angular Pressing

2003 ◽  
Vol 426-432 ◽  
pp. 2795-2800 ◽  
Author(s):  
Hiroyuki Miyamoto ◽  
Uwe Erb ◽  
Tetsuo Koyama ◽  
Takura Mimaki ◽  
Alexei Vinogradov ◽  
...  
Keyword(s):  
Single Crystals ◽  
Equal Channel Angular Pressing ◽  
Crystal Orientation ◽  
Deformation Structure ◽  
Angular Pressing ◽  
Copper Single Crystals

scholarly journals Randomly oriented twin domains in electrodeposited silver dendrites

2015 ◽  
Vol 80 (1) ◽  
pp. 107-113 ◽  
Author(s):  
Evica Ivanovic ◽  
Nebojsa Nikolic ◽  
Velimir Radmilovic
Keyword(s):  
Electron Microscopy ◽  
Orientation Imaging Microscopy ◽  
Dark Field ◽  
High Angle ◽  
Orientation Imaging ◽  
Transmission Electron ◽  
Annular Dark Field ◽  
Silver Dendrites ◽  
Z Contrast ◽  
Scanning Electron

Silver dendrites were prepared by electrochemical deposition. The structures of Ag dendrites, the type of twins and their distribution were investigated by scanning electron microscopy (SEM), Z-contrast high angle annular dark field transmission electron microscopy (HAADF), and crystallografically sensitive orientation imaging microscopy (OIM). The results revealed that silver dendrites are characterized by the presence of randomly distributed 180? rotational twin domains. The broad surface of dendrites was of the {111} type. Growth directions of the main dendrite stem and all branches were of <112> type.

scholarly journals Mechanical Properties and Microstructure Evolution of Mg-6 wt % Zn Alloy during Equal-Channel Angular Pressing

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 841 ◽  
Author(s):  
Jingli Yan ◽  
Zijun Qin ◽  
Kai Yan
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
Testing Machine ◽  
Grain Structure ◽  
X Ray Diffraction ◽  
Angular Pressing ◽  
Transmission Electron ◽  
Zn Alloy

Equal-channel angular pressing (ECAP) was performed on a Mg (6 wt %) Zn alloy at temperatures from 160 to 240 °C and the microstructures and mechanical properties were studied using optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and an electronic universal testing machine. The results showed that ECAP was effective for grain refinement and a bi-modal grain structure formed at low temperatures, which was stable during ECAP from 160 to 200 °C. MgZn2 phase and Mg4Zn7 phase were generated during the ECAP process. The mechanical properties remarkably increased after two repetitions of ECAP. However, the strengths could not be further improved by increasing the plastic deformation, but decreased when ECAP was performed between 200 and 240 °C. The mechanical properties of the ECAP Mg-6Zn alloy was determined by a combination of grain refinement strengthening, precipitation hardening, and texture softening.

scholarly journals Microstructure characterization of a duplex stainless steel weld by electron backscattering diffraction and orientation imaging microscopy techniques

2015 ◽  
Vol 20 (1) ◽  
pp. 212-226 ◽  
Author(s):  
Isabela Viegas Aguiar ◽  
Diana Pérez Escobar ◽  
Dagoberto Brandão Santos ◽  
Paulo J. Modenesi
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Electron Backscatter Diffraction ◽  
Orientation Imaging Microscopy ◽  
Orientation Distribution ◽  
Orientation Imaging ◽  
Transmission Electron ◽  
Ebsd Technique ◽  
Microscopy Techniques

This paper describes the electron backscatter diffraction (EBSD) technique used to characterize the microstructure (especially the morphology and constitution) of the base metal (BM), the heat-affected zone (HAZ) and the fusion zone (FZ) on a lean duplex stainless steel (LDX). This technique provides advantages due to its simplicity of use and greater depth of information, thereby increasing the amount of information obtained by traditional characterization techniques such as optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The use of EBSD together with orientation imaging microscopy (OIM) as a tool to understand phase transformation paths and ferrite-austenite variant selection was discussed. Vickers microhardness measurements were performed and no significance difference between the different zones was found. Orientation distribution function (ODF) results show that there are no significant changes on the crystallographic texture of the samples after welding. The advantages of using SEM together with EBSD for microstructure analyzing and texture development were also discussed.

Investigation on Three-Dimensional Microstructures and Tensile Properties of Pure Iron during Equal-Channel Angular Pressing

2010 ◽  
Vol 667-669 ◽  
pp. 791-796
Author(s):  
Gang Yang ◽  
Mu Xin Yang ◽  
Zheng Dong Liu ◽  
Chang Wang ◽  
Chong Xiang Huang
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Band Structure ◽  
Equal Channel Angular Pressing ◽  
Pure Iron ◽  
Three Dimensional ◽  
Microstructural Refinement ◽  
Angular Pressing ◽  
Transmission Electron

Commercial pure iron billets having diameter of 60 mm and length of 180 mm were subjected to equal channel angular pressing (ECAP) at 350 °C for 1-4 passes via route BC. Microstructural evolutions on three planes (X, Y, Z planes) were characterized by optical microscopy and transmission electron microscopy (TEM). It was found that after four passes an ultrafine microstructure could be formed on the X plane, but a band structure remained on the Z plane. Accordingly, the mechanical properties exhibited apparent dependence on the orientations. The strength in the X and Y directions was higher than that in the Z direction. The microstructural refinement and mechanical properties were discussed in terms of experimental results.

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