A comparison of continuous SPD processes for improving the mechanical properties of aluminum alloy 6111

2009 ◽  
Vol 24 (2) ◽  
pp. 459-469 ◽  
Author(s):  
R. Lapovok ◽  
L.S. Tóth ◽  
M. Winkler ◽  
S.L. Semiatin
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Velocity ◽  
Asymmetric Rolling ◽  
Shear Texture ◽  
Angular Pressing ◽  
Grain Structures ◽  
Billet Material ◽  
Conventional Rolling ◽  
Aluminum Alloy 6111

Microstructure evolution, mechanical properties, formability, and texture development were determined for AA6111 samples processed by asymmetric rolling (ASR) with different roll friction, velocity, or diameters, conventional rolling (CR), and equal-channel-angular pressing (ECAP). Highly elongated or sheared grain structures were developed during ASR/CR and ECAP, respectively. ASR led to improved r-values and formability compared with CR primarily as a result of the development of moderate shear-texture components analogous to those developed during ECAP of billet material. ASR based on different roll diameters gave the best combination of strength, ductility, and formability.

Characterization of Microstructure and Mechanical Properties of 6060 Aluminum Alloy Processed by ECAP

2018 ◽  
Vol 275 ◽  
pp. 81-88
Author(s):  
Monika Karoń ◽  
Marcin Adamiak
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Internal Stresses ◽  
Refined Grains ◽  
Angular Pressing ◽  
Heat Treated ◽  
Evolution Of Microstructure

The purpose of this paper is to present the microstructure and mechanical behavior of 6060 aluminum alloy after intense plastic deformation. Equal Channel Angular Pressing (ECAP) was used as a method of severe plastic deformation. Before ECAP part of the samples were heat treated to remove internal stresses in the commercially available aluminium alloy. The evolution of microstructure and tensile strength were tested after 1, 3, 6 and 9 ECAP passes in annealed and non annealed states. It was found that intensely plastically deformed refined grains were present in the tested samples and exhibited increased mechanical properties. Differences were noted between samples without and after heat treatment

Influence of aging on mechanical properties of equal channel angular pressed aluminum alloy 7075

2015 ◽  
Vol 231 (10) ◽  
pp. 1803-1811 ◽  
Author(s):  
Seyed Mahmoud Ghalehbandi ◽  
Alireza Fallahi Arezoodar ◽  
Hossein Hosseini-Toudeshky
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Equal Channel Angular Pressing ◽  
Room Temperature ◽  
Solution Treatment ◽  
Aging Treatment ◽  
Subsequent Aging ◽  
Good Ductility ◽  
Angular Pressing ◽  
Aluminum Alloy 7075

Effect of aging treatment on mechanical properties of an age-hardenable aluminum alloy after equal channel angular pressing at room temperature has been investigated using hardness, stress–strain behavior and surface fractography. Aluminum alloy 7075 was pressed after solution treatment. Yield stress, ultimate stress and hardness of pressed samples have increased significantly compared with those of coarse grain, but the elongation to failure has decreased. Also the pressed specimens were subjected to aging treatment at room temperature and temperatures of 80 °C, 100 °C, 120 °C and 140 °C to obtain the optimized strength and ductility. The results indicated that post–equal channel angular pressing aging at 80 °C has resulted in the maximum strength, and natural aging has resulted in good ductility and acceptable strength. It confirmed the fact that there is a potential in obtaining high strength and good ductility in age-hardenable alloys employing severe plastic deformation and subsequent aging.

The Influence of ECAP Pass through Bc Route on Mechanical Properties of Aluminum Alloy 6061

2014 ◽  
Vol 1024 ◽  
pp. 219-222
Author(s):  
Soon Vern Yee ◽  
Zuhailawati Hussain ◽  
Anasyida Abu Seman ◽  
Muhammad Syukron ◽  
Indra Putra Almanar
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Aluminum Alloy ◽  
Casting Process ◽  
Applied Strain ◽  
Channel Angle ◽  
Aluminum Alloy 6061 ◽  
Angular Pressing ◽  
Pass Through ◽  
Alloy 6061

Equal Channel Angular Pressing (ECAP) is one of Severe Plastic Deformation (SPD) methods used to produce ultra-fine grains. In this study, aluminum alloy 6061 in a rod shape as a result from casting process was used in the experiment. The rod samples were then subjected to ECAP, up to 3 passes, through Bc route. The die channel angle of the ECAP is 1200. The changes in the microstructure and mechanical properties of the samples deformed by 1-pass, 2-pass, and 3-pass of ECAP were investigated. The results show that as number of ECAP passes increase, the applied strain accumulated in the samples also increases and the grains change from equiaxed to elongated structure. The hardness is proportional to the number of ECAP passes, and the highest value is 107 HV for 3 passes with strain value of 2.0.

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.

scholarly journals Microstructure and Texture Evolution with Relation to Mechanical Properties of Compared Symmetrically and Asymmetrically Cold Rolled Aluminum Alloy

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 156 ◽  
Author(s):  
Jakob Kraner ◽  
Peter Fajfar ◽  
Heinz Palkowski ◽  
Goran Kugler ◽  
Matjaž Godec ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Strain Ratio ◽  
Tensile Tests ◽  
Asymmetric Rolling ◽  
Plastic Strain Ratio ◽  
Rolled Aluminum ◽  
The Impact

The impact of asymmetric cold rolling was quantitatively assessed for an industrial aluminum alloy AA 5454. The asymmetric rolling resulted in lower rolling forces and higher strains compared to conventional symmetric rolling. In order to demonstrate the positive effect on the mechanical properties with asymmetric rolling, tensile tests, plastic-strain-ratio tests and hardness measurements were conducted. The improvements to the microstructure and the texture were observed with a light and scanning electron microscope; the latter making use of electron-backscatter diffraction. The result of the asymmetric rolling was a much lower planar anisotropy and a more homogeneous metal sheet with finer grains after annealing to the soft condition. The increased isotropy of the deformed and annealed aluminum sheet is a product of the texture heterogeneity and reduced volume fractions of separate texture components.

scholarly journals Tailoring One-Pass Asymmetric Rolling of Extra Low Carbon Steel for Shear Texture and Recrystallization

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1935 ◽  
Author(s):  
Satyaveer Singh Dhinwal ◽  
Laszlo S. Toth ◽  
Rimma Lapovok ◽  
Peter Damian Hodgson
Keyword(s):  
Tensile Strength ◽  
Carbon Steel ◽  
Strain Rate ◽  
Low Carbon Steel ◽  
Thickness Reduction ◽  
Low Carbon ◽  
Asymmetric Rolling ◽  
Shear Texture ◽  
Grain Fragmentation ◽  
Conventional Rolling

Systematic single pass rolling experiments were carried out at room temperature on extra low carbon steel by varying the roll diameter ratio between 1:1 to 1:2 and thickness reduction per pass in the range of 20–75%. The aim of this study was to define the conditions under which the rolling texture can transit into a shear texture. The consequences for grain fragmentation, tensile strength, recrystallization texture, and grain growth kinetics were also studied. It was found that in a certain range of thickness reduction per pass and asymmetric ratio, an effective rotation towards the shear texture takes place in conventional rolling. The value of the shear coefficient factor (shear strain rate/rolling strain rate) in asymmetric rolling depends on the selection of thickness reduction per pass. The measured value of shear coefficient was found to be independent of the number of passes used in asymmetric rolling. The consequence of arising shear textures is an acceleration of grain fragmentation. After rapid heat treatment, both tensile strength and recrystallization kinetics of asymmetric rolled sheets showed merits over the conventional rolling. Only the evolved Goss orientation from asymmetric conditions of deformation shows higher stability than any other preferred shear texture components after complete recrystallization.

scholarly journals Analysis of Microstructure and Mechanical Properties Changes in AA1050 Aluminum Subjected to ECAP and KoBo Processes / Analiza Zmian Mikrostruktury I Własności Mechanicznych Aluminium AA1050 Po Procesie ECAP I KoBo

2015 ◽  
Vol 60 (4) ◽  
pp. 3063-3068 ◽  
Author(s):  
R. Bogucki ◽  
K. Sulikowska ◽  
M. Bieda ◽  
P. Ostachowski ◽  
K. Sztwiertnia
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Grain Boundaries ◽  
Equal Channel Angular Pressing ◽  
High Angle ◽  
Electron Backscattered Diffraction ◽  
Deformation Degree ◽  
Angular Pressing ◽  
Ecap Process ◽  
Processed Sample

Analysis of the results of the microstructure and the mechanical properties change in AA1050 aluminum alloy of technical purity processed using ECAP (Equal Channel Angular Pressing) and KoBo deformation methods are presented in the paper.. ECAP process was performed according to Bc scheme in the range from 1 up to 10 passes. Changes of microstructure were analyzed using scanning electrone microscope equipped with electron backscattered diffraction (EBSD) system. Microstructure and fraction of high-angle grain boundaries in KoBo processed samples were similar to those observed in ECAP processed samples after four passes. The most significant microstructure refinement was observed in ECAP processed sample submitted to 10 passes. In ECAP method the systematic increase of mechanical properties was observed along with increase of deformation degree.

Creep and Mechanical Properties of a Commercial Aluminum Alloy Processed by ECAP

2006 ◽  
Vol 503-504 ◽  
pp. 77-82 ◽  
Author(s):  
Cheng Xu ◽  
Terence G. Langdon
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Strain Rate ◽  
Testing Temperature ◽  
Cast Aluminum Alloy ◽  
Cast Aluminum ◽  
Creep Tests ◽  
Double Shear ◽  
Angular Pressing ◽  
Ultrafine Grained

A commercial spray-cast aluminum alloy, having a composition of Al-11.5% Zn-2.5% Mg-0.9% Cu-0.2% Zr, was processed by equal-channel angular pressing (ECAP) to give an ultrafine-grained microstructure with a grain size of ~0.3 μm and a fracturing of the rod-shaped MgZn2 precipitates. The mechanical properties of the alloy were investigated using microhardness testing at ambient temperature and tensile testing at a temperature of 673 K. In addition, creep tests were conducted using a double-shear testing facility at temperatures from 473 to 673 K. The results show the microhardness decreases with increasing numbers of passes in ECAP and high strain rate superplasticity is achieved after processing by ECAP at 473 K for 6 or 8 passes. A maximum elongation of >1000% was recorded at a strain rate of 10-2 s-1 when testing at 673 K. The creep tests show the creep rates are faster in the as-pressed material than in the as-received material when testing at the same applied stress and testing temperature.

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