Equal channel angular pressing with rotating shear plane to produce hybrid materials with helical architecture of constituents

2017 ◽  
Vol 32 (24) ◽  
pp. 4483-4490
Author(s):  
Rimma Lapovok ◽  
Andrey Molotnikov ◽  
Alexander Medvedev ◽  
Yuri Estrin
Keyword(s):  
Equal Channel Angular Pressing ◽  
Hybrid Materials ◽  
Shear Plane ◽  
Angular Pressing ◽  
Image Position

Abstract

Enhancing grain refinement efficiency and fading resistance of Al–B master alloys processed by equal channel angular pressing

2018 ◽  
Vol 33 (12) ◽  
pp. 1782-1788
Author(s):  
Kun Xia Wei ◽  
Yan Wei Zhang ◽  
Wei Wei ◽  
Xian Liu ◽  
Qing Bo Du ◽  
...  
Keyword(s):  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
Angular Pressing ◽  
Refinement Efficiency ◽  
Master Alloys ◽  
Image Position

Abstract

Influence of annealing on ductility of ultrafine-grained titanium processed by equal-channel angular pressing–Conform and drawing

2013 ◽  
Vol 3 (4) ◽  
pp. 249-253 ◽  
Author(s):  
Alexander V. Polyakov ◽  
Irina P. Semenova ◽  
Ruslan Z. Valiev ◽  
Yi Huang ◽  
Terence G. Langdon
Keyword(s):  
Equal Channel Angular Pressing ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Image Position

Abstract

Study on structure homogeneity of plate sample with large dimension during equal channel angular pressing (ECAP)

2016 ◽  
Vol 31 (21) ◽  
pp. 3420-3427 ◽  
Author(s):  
Jinfang Dong ◽  
Qing Dong ◽  
Yongbing Dai ◽  
Hui Xing ◽  
Yanfeng Han ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Large Dimension ◽  
Angular Pressing ◽  
Image Position

Abstract

scholarly journals Augmentation of Fatigue and Tensile Strength of AA-6061 Processed through Equal Channel Angular Pressing

2019 ◽  
Vol 38 (2) ◽  
pp. 435-442
Author(s):  
Nazeer Ahmed Anjum ◽  
Shahid Mehmood ◽  
Waqas Anwar ◽  
Zahid Sulman ◽  
Saeed Badshah
Keyword(s):  
Equal Channel Angular Pressing ◽  
Stress Ratio ◽  
Shear Plane ◽  
Tensile Tests ◽  
Fatigue Tests ◽  
Perfectly Plastic ◽  
Outer Corner ◽  
Angular Pressing ◽  
Hardness Tests ◽  
Point Bend

ECAP (Equal Channel Angular Pressing) is a technique used to enhance the strength of material by grain refinement. In this research, an aerospace grade aluminum alloy-6061 is investigated. The specimens were pressed through ECAP die channels, intersecting each other at an angle of 90oC where a shear plane of 45oC was developed, that results grains refinement. Fatigue strengths and CGR (Crack Growth Rate) for the stress ratio R 0.7 and 0.1 are found and compared with the as-received material.It was observed that the CGR is slower at stress ratio R=0.1, as compared to stress ration R=0.7. An electric furnace was embedded with ECAP die to regulate the material flow through this die. The temperature of the die was maintained at 450oC during ECAP pressing and the specimens were also preheated at this temperature using another furnace. The ECAP die consists of two channels intersecting at 90o provided with safe inner and outer corner radius to avoid scaling.The microstructural observations revealed that the deformation was perfectly plastic. The ECAPed and as-received materials were also characterized by tensile tests, micro-hardness tests, and 3-point bend fatigue tests.

Formation of High-Angle Grain Boundaries in Iron upon Cold Deformation by Equal-Channel Angular Pressing

2004 ◽  
Vol 467-470 ◽  
pp. 1277-1282 ◽  
Author(s):  
Sergey V. Dobatkin ◽  
V.I. Kopylov ◽  
Reinhard Pippan ◽  
O.V. Vasil'eva
Keyword(s):  
Grain Boundaries ◽  
Structure Formation ◽  
Equal Channel Angular Pressing ◽  
Cold Deformation ◽  
Shear Plane ◽  
Ebsd Analysis ◽  
High Angle ◽  
Angular Pressing

At present, the possibility of the formation of high-angle grain boundaries upon severe cold deformation, in particular, equal-channel angular (ECA) pressing is reliably proved. The structure formation upon multi-cycle ECA pressing substantially depends on the route determining the shear plane in the sample upon repeated passes. The route is defined by the rotation of the sample around its axis upon the multi-cycle ECA pressing. There are four main routes: route A, in which the sample is deformed by many passes without any rotations; route Ba, in which the sample is rotated by ± 90°; route Bc, in which the sample is sequentially rotated in the same direction by 90°and route C, in which the sample is rotated by 180° about its axis before each subsequent pass. By the methods of SEM, TEM and EBSD analysis it was shown that the fraction of high-angle boundaries in a-Fe upon cold ECA pressing with an angle of 90° between the channels and N=4 depends on the deformation route and increases according to the route sequence: Ba-C-Bc.

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.

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