scholarly journals PERUBAHAN NILAI KEKERASAN DAN KONDUKTIVITAS LISTRIK ALUMINIUM AKIBAT PROSES EQUAL CHANNEL ANGULAR PRESSING (ECAP)

ROTASI ◽  
2014 ◽  
Vol 16 (4) ◽  
pp. 41
Author(s):  
Rusnaldy Rusnaldy ◽  
Norman Iskandar ◽  
Muhammad Khairul Rais ◽  
Wisnu Tri Erlangga
Keyword(s):  
Electrical Conductivity ◽  
Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Hardness Test ◽  
Hardness Measurement ◽  
Optical Microscope ◽  
Pure Aluminium ◽  
Angular Pressing ◽  
Ecap Process ◽  
Number Of Passes

In current study, Equal Channel Angular Pressing (ECAP) process was applied to pure aluminium rod. The effect of the number of passes on hardness and electrical conductivity ECAP samples was investigated. The dimensions of ECAP die for 12 mmm diameter workpieces are designed with intersect angle of 120o. The experiments were carried out by using samples cut from an ingot and a rod and machined to a size of 12 mm in diameter and 50 mm in length. The workpiece was pressed into the ECAP die up to 7 passes at room temperature.After deformation, all samples were subjected to a hardness test, an electrical conductivity test and for optical microscope study. The hardness measurement of the ECAP samples suggested that enhanced hardness would be obtained by repeating ECAP process.Increasing the electrical conductivity of the ECAP samples indicatesthat there is no dislocation formation due to increasing plastic deformation in ECAP process

Influence of Plastic Deformation during ECAP on Precipitation Temperature of γ″ in IN 718 Alloy

2006 ◽  
Vol 118 ◽  
pp. 431-436
Author(s):  
Il Ho Kim ◽  
S.I. Kwun
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Aging Treatment ◽  
Hardness Test ◽  
Microstructural Observation ◽  
Angular Pressing ◽  
Ecap Process ◽  
Before And After ◽  
Formation Behavior

The formation behavior of γ″(Ni3Nb) precipitates in IN 718 alloy before and after ECAP(equal channel angular pressing) was investigated by microstructural observation and the hardness test. For the alloy examined before ECAP, the γ″ precipitates were formed only after aging treatment at 720, whereas after ECAP, the γ″ precipitates were formed at the aging temperatures of both 600 and 720. 600 is normally too low a temperature for γ″ precipitates to be formed in commercial IN 718 alloy, however, they were able to be formed due to severe plastic deformation by ECAP. It was found that the ECAP process changed the formation behavior of the γ″ precipitates in IN 718 alloy.

Mechanical Properties of Al6061 Processed by Equal Channel Angular Pressing

2012 ◽  
Vol 585 ◽  
pp. 392-396 ◽  
Author(s):  
Ankit Sahai ◽  
Rahul Swarup Sharma ◽  
K. Hans Raj ◽  
Narinder Kumar Gupta
Keyword(s):  
Mechanical Properties ◽  
Equal Channel Angular Pressing ◽  
Manufacturing Industry ◽  
High Strength ◽  
Load Variations ◽  
Outer Corner ◽  
Angular Pressing ◽  
Ecap Process ◽  
Circular Specimen ◽  
Number Of Passes

The severe plastic deformation (SPD) is an effective approach for producing bulk nanostructured materials. The Equal Channel Angular Pressing (ECAP) is the most efficient SPD solution for achieving ultra-fined grained (UFG) material as billet undergoes severe and large deformation. The process parameters of ECAP (Channel Angle, angle of curvature, friction, number of passes, etc) influences major impact on the properties. In present work, the ECAP process is performed by pressing a specimen through a die consisting of two intersecting channels meeting at an angle φ and outer corner meeting at an angle ψ. Experiments with a circular specimen of Al6061 were conducted to investigate the changes in mechanical properties upto 2 passes. 3-D finite element simulations were also performed using metal forming software FORGE to study the evolution of strain in the specimen during the ECAP process. Simulation results were investigated by comparing them with experimental measured data in terms of load variations. The present work clearly shows that ECAP caused accentuated increase in Al6061 hardness and tensile strength during multi-pass processing. This study is beneficial in developing high quality, high strength products in manufacturing industry on account of its ability to change microstructure of materials.

Equal Channel Angular Pressing of Metallic Powders for Nanostructured Materials

2006 ◽  
Vol 503-504 ◽  
pp. 221-226 ◽  
Author(s):  
Seung Chae Yoon ◽  
Hyoung Seop Kim
Keyword(s):  
Plastic Deformation ◽  
Nanostructured Materials ◽  
Equal Channel Angular Pressing ◽  
Powder Processing ◽  
Full Density ◽  
Bottom Up ◽  
Metallic Powders ◽  
Angular Pressing ◽  
Ecap Process ◽  
Strain And Strain Rate

In this study, bottom-up type powder processing and top-down type SPD (severe plastic deformation) approaches were combined in order to achieve both full density and grain refinement of metallic powders with least grain growth, which was considered as a bottle neck of the bottom-up method using the conventional powder metallurgy of compaction and sintering. ECAP (Equal channel angular pressing), one of the most promising method in SPD, was used for the powder consolidation. In the ECAP process of not only solid but also powder metals, knowledge of the density as well as internal stress, strain and strain rate distribution is important for understanding the process. We investigated the consolidation, plastic deformation and microstructure evolution behavior of the metallic powders during ECAP using experimental and theoretical methods. Almost independent behavior of powder densification in the entry channel and shear deformation in the main deformation zone was found by the finite element method in conjunction with a pressure dependent material yield model. It was found that high mechanical strength could be achieved effectively as a result of the well bonded powder contact surface during ECAP process of gas atomized Al-Si powders. The SPD processing of powders is a viable method to achieve both fully density and nanostructured materials.

Densification and Conolidation of Powders by Equal Channel Angular Pressing

2007 ◽  
Vol 534-536 ◽  
pp. 253-256 ◽  
Author(s):  
Seung Chae Yoon ◽  
Sun Ig Hong ◽  
Soon Hyung Hong ◽  
Hyoung Seop Kim
Keyword(s):  
Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Powder Processing ◽  
Full Density ◽  
Bottom Up ◽  
Powder Consolidation ◽  
Metallic Powders ◽  
Angular Pressing ◽  
Ecap Process ◽  
Strain And Strain Rate

In this study, bottom-up type powder processing and top-down type SPD (severe plastic deformation) approaches were combined in order to achieve both full density and grain refinement of metallic powders with least grain growth, which is considered as a bottle neck of the bottom-up method that uses the conventional powder metallurgy of compaction and sintering. ECAP (Equal channel angular pressing), one of the most promising method in SPD, was used for the powder consolidation. In the ECAP process of not only solid but also powder metals, it is important to get a good understanding of the density as well as internal stress, strain and strain rate distribution. We investigated the consolidation, plastic deformation and microstructure evolution behavior of the metallic powders during ECAP using an experimental method. It was found that high mechanical strength could be achieved effectively due to the well bonded powder contact surface during ECAP process of gas atomized Al-Si powders. The experimental results show that SPD processing of powders is a viable method to achieve both fully density and nanostructured materials.

Mechanical Properties of Different Coppers Processed by Equal Channel Angular Pressing

2010 ◽  
Vol 667-669 ◽  
pp. 713-718 ◽  
Author(s):  
Oscar Fabián Higuera ◽  
Jairo Alberto Muñoz ◽  
Jose María Cabrera
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Electrical Conductivity ◽  
Equal Channel Angular Pressing ◽  
Room Temperature ◽  
Angular Pressing ◽  
Cu Alloys ◽  
Ecap Process ◽  
First Pass ◽  
Annealing Heat Treatment

Mechanical properties of two Cu alloys (electrolytic and fire refined) severely deformed by equal channel angular pressing (ECAP) process were investigated. They were treated with a annealing heat treatment to 600°C during 30 minutes and then they were extruded in a Φ=90º ECAP die at room temperature following route Bc. Heavy deformation was introduced in the samples after a considerable number of ECAP passes from 1, 2, 3, 4, 5, 6, 7, 8, to 16. The principal changes were introduced in the first pass by ECAP but a gradual increment in the mechanical properties was observed for the consecutive ECAP passes. Also, the electrical conductivity decreased with increasing numbers of ECAP passes.

Effect of Process Parameters on Microstructure and Mechanical Properties on Severe Plastic Deformation Process of Aa7075-T6 Aluminum Alloy

2012 ◽  
Vol 622-623 ◽  
pp. 705-709 ◽  
Author(s):  
U. Mohammed Iqbal ◽  
V.S. Senthil Kumar
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Equal Channel Angular Extrusion ◽  
Extrusion Process ◽  
Angular Pressing ◽  
Twist Extrusion ◽  
Number Of Passes

Severe plastic deformation is one of the emerging and promising techniques applied to bulk materials to produce fine grain structure with attractive properties. This study aims to investigate the effect of extrusion parameters like extrusion temperature, number of passes on the equal channel angular pressing and twist extrusion forming behavior of AA7075-T6 Aluminum alloy by hot extrusion process. AA7075-T6 samples of 70x28x18 mm cross sections extruded by equal channel angular pressing and twist extrusion process was subjected to microstructure analysis, hardness and tensile tests in order to determine their mechanical properties. As a result of the experiments, it was determined that twist extrusion leads to more grain refinement at high temperatures with more number of passes compared to equal channel angular pressing. SEM micrographs show that there is severe orientation of the grains facilitated by the extrusion process which enhances the strength. The dense banding of the grains had effected in marginal hardness enhancement in the matrix of the specimens processed by twist extrusion and equal channel angular extrusion process.

Structural Non-Homogeneity and Thermal Instability of ECAP Aluminium

2007 ◽  
Vol 567-568 ◽  
pp. 193-196 ◽  
Author(s):  
Ivan Saxl ◽  
L. Ilucová ◽  
Milan Svoboda ◽  
Vàclav Sklenička ◽  
Vladimir I. Betekhtin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Equal Channel Angular Pressing ◽  
Creep Deformation ◽  
Thermal Instability ◽  
Grain Structure ◽  
Pure Aluminium ◽  
Electron Backscattered Diffraction ◽  
Structural Homogeneity ◽  
Angular Pressing ◽  
Number Of Passes

The grain structure of pure aluminium processed by equal channel angular pressing (ECAP) was examined electron backscattered diffraction (EBSD) in the as pressed state and after heating preceding the creep deformation using various stereological methods. Area intensities of grain and subgrain boundaries, length intensities of triple grain and subgrain junctions, structural homogeneity and its thermal stability are strictly dependent on the number of passes.

Effect of Addition of Some Grain Refiners to Zinc-Aluminum 22, ZA22, Alloy on its Grain Size, Mechanical Characteristics in the Cast and after Pressing by the Equal Channel Angular Pressing, ECAP

2015 ◽  
Vol 1105 ◽  
pp. 172-177 ◽  
Author(s):  
Adnan I.O. Zaid ◽  
Jehad A.S. AlKasasbeh ◽  
S.M.A. Al-Qawabah
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Severe Plastic Deformation ◽  
Equal Channel Angular Pressing ◽  
Mechanical Characteristics ◽  
The Other ◽  
Angular Pressing ◽  
Ecap Process ◽  
Maximum Decrease ◽  
Cast Condition

In this paper, the effect of addition of some grain refiners namely: molybdenum, titanium and titanium+boron to zinc-aluminum 22%, ZA22, alloy on its microstructure and mechanical characteristics is investigated in two conditions one in the cast condition and the other after pressing by the equal channel angular pressing, ECAP. Recently the ECAP process has been used to produce severe plastic deformation. It was found that addition of any of these elements to ZA22 alloy resulted in grain refinement of its structure both in the cast and after pressing by the ECAP conditions, being more pronounced after pressing by ECAP. The maximum decrease was %. Furthermore, it resulted in enhancement of its mechanical strength at, indicating softening of the alloy. Regarding the effect on its hardness, it decreased by th addition of either Mo or Ti+B. at any rate of Mo addition.

scholarly journals Effect of Microstructure and Mechanical Properties of Al5083 Alloy Processed by ECAP at Room Temperature and High Temperature

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 683
Author(s):  
Muneer Baig ◽  
Ateekh Ur Rehman ◽  
Jabair A. Mohammed ◽  
Asiful H. Seikh
Keyword(s):  
Equal Channel Angular Pressing ◽  
Room Temperature ◽  
Optical Microscope ◽  
Grain Structure ◽  
Fine Grained ◽  
Angular Pressing ◽  
Al 5083 Alloy ◽  
Fine Grained Structure ◽  
Number Of Passes

In this investigation, the focus is on improving the quality of the Al 5083 alloy by equal-channel angular pressing (ECAP) innovation. Equal-channel angular pressing (ECAP) is one of the best technologies for converting macro grain into ultra-fine-grained structure. Grain structure which is finer increases the strength of the material. In this work, a severe plastic deformation using equal-channel angular pressing (ECAP) up to 3 passes was given on Al5083 alloy using path BC at room temperature. The evolution of the microstructure was studied using an optical microscope. Tensile studies were also done. Both hardness (Vickers) and tensile strength rises as the number of passes increases; however, the ductility or the percentage of elongation increases. It can be said that the final product of this aforementioned alloy after ECAPed processing is considered to be suitable for various applications in which higher strength is required.

Effect of Equal Channel Angular Pressing and Post Heating on Microstructure and Hardness of Cu-Zn 70/30

2013 ◽  
Vol 789 ◽  
pp. 373-378 ◽  
Author(s):  
Suryadi Suryadi ◽  
R.A.M. Napitupulu ◽  
Dedi Priadi ◽  
Amin Suhadi ◽  
Eddy S. Siradj
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Optical Microscopy ◽  
Equal Channel Angular Pressing ◽  
Hardness Test ◽  
Grain Structure ◽  
Micro Hardness ◽  
Microstructure Change ◽  
Angular Pressing

Severe plastic deformation (SPD) using various pass number of Equal Channel Angular Pressing (ECAP) experiment and followed heating at 400°C has been done for rod brass Cu-Zn 70/30 to investigate the operation on microstructure and hardness of the alloy. Optical microscopy and SEM are used to examine the microstructure change. Mechanical testing such as macro and micro hardness test is used in order to examine the change of mechanical properties. The grain structure of the alloy was refined from 34 μm to 2 μm after 4 passes ECAP and increased to 4 μm after post heating. The hardness of the alloy significantly increased from 78 Hv to 235 Hv after 4 passes and decreased to 135 Hv after post heating after ECAP. The microstructure and mechanical properties of the alloy was homogenous after 4 passes ECAP because the strain was found more homogenous.

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