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.

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

Unique Features of Ultrafine-Grained Microstructures in Materials Having Low Stacking Fault Energy

2010 ◽  
Vol 659 ◽  
pp. 171-176 ◽  
Author(s):  
Jenő Gubicza ◽  
Nguyen Q. Chinh ◽  
János L. Lábár ◽  
Zoltán Hegedűs ◽  
Terence G. Langdon
Keyword(s):  
Equal Channel Angular Pressing ◽  
Room Temperature ◽  
Strong Dependence ◽  
Stacking Fault ◽  
Stacking Fault Energy ◽  
Controlled Processes ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Number Of Passes

The evolution of the microstructure during processing by equal-channel angular pressing (ECAP) in silver having extremely low stacking fault energy was studied up to 16 passes. It was shown that at high strains the contribution of twinning to deformation increased at the expense of dislocation-controlled processes. It was also found that during storage at room temperature (i.e. at the temperature of ECAP) there was a self-annealing of the severely deformed microstructure after 1 month and its degree was revealed to have a strong dependence on the number of passes.

Development of Ultra-Fine Grained Structure in an Al-5.4%Mg-0.5%Mn Alloy Processed by ECAP

2010 ◽  
Vol 667-669 ◽  
pp. 487-492
Author(s):  
Alla Kipelova ◽  
Ilya Nikulin ◽  
Sergey Malopheyev ◽  
Rustam Kaibyshev
Keyword(s):  
Plastic Deformation ◽  
Structure Formation ◽  
Equal Channel Angular Pressing ◽  
Microstructural Evolution ◽  
Coarse Grained ◽  
High Angle ◽  
Fine Grained ◽  
Angular Pressing ◽  
Fine Grained Structure ◽  
Zr Alloy

Microstructural changes during equal channel angular pressing (ECAP) at the temperatures of 250 and 300°C to the strains ~4, ~8 and ~12 were studied in a coarse-grained Al-5.4%Mg-0.5%Mn-0.1%Zr alloy. At a strain of ~4, the microstructural evolution is mainly characterized by the development of well-defined subgrains within interiors of initial grains and the formation of fine grains along original boundaries. Further straining leads to increase in the average misorientation angle, the fraction of high-angle grain boundaries and the fraction of new grains. However, only at 300°C, the plastic deformation to a strain of ~12 leads to the formation of almost uniform submicrocrystalline (SMC) grained structure with an average crystallites size of ~ 0.5 m. At 250°C, the microstructure remains non-uniform and consists of subgrains and new recrystallized grains. The mechanism of new SMC structure formation after ECAP is discussed.

Numerical Simulation and Experimental Research on the Deformation of Equal Channel Angular Pressing of Al-5Ti-1B Aluminum Alloy

2013 ◽  
Vol 815 ◽  
pp. 251-255
Author(s):  
Wen Yu Zhang ◽  
Xian Lan Liu ◽  
Xiao Ming Jin
Keyword(s):  
Equal Channel Angular Pressing ◽  
Room Temperature ◽  
Effective Strain ◽  
Optical Microscope ◽  
Test Machine ◽  
Uniform Deformation ◽  
Outer Corner ◽  
Angular Pressing ◽  
Element Simulation ◽  
Simulation Results

The effective strain size and distribution of Al-5Ti-1B alloy deformed by equal channel angular pressing (ECAP) were investigated through the finite element simulation by the die with outer corner ψ=0°, 20°, 30° and the friction coefficient f=0, 0.2, 0.3. The simulation results show that the effective strains decrease with the increase of the outer corner ψ from 0° to 30° with a constant f; the more uniform deformation were obtained under the conditions of large friction than that of small friction. Al-5Ti-1B alloy was produced by once path ECAP at room temperature under the die with the corner angle φ=90° and ψ=20°. The optical microscope and compressing test machine were performed. The results indicate that the grain size was obviously refined. The yield strength increased by 37.5% from 142.0MPa to 195.3MPa, and hardness increased by 24% from 45.2HV to 55.9 HV.

Development of Microstructure and Texture in Al5052 Alloy Processed at Room and Cryogenic Temperatures in an ECAP Die

2011 ◽  
Vol 702-703 ◽  
pp. 89-92
Author(s):  
Jung B. Singh ◽  
Apu Sarkar ◽  
Garima Sharma ◽  
V. Basavaraj ◽  
J.K. Chakravartty
Keyword(s):  
Yield Strength ◽  
Equal Channel Angular Pressing ◽  
Cryogenic Temperature ◽  
Room Temperature ◽  
Reduction Rate ◽  
Fold Increase ◽  
Cryogenic Temperatures ◽  
Angular Pressing ◽  
Two Temperatures ◽  
Number Of Passes

Development of microstructure and texture in alloy Al5052 deformed at room and cryogenic temperatures in an equal channel angular pressing (ECAP) die has been investigated. Billets were deformed using the Bc route up to 14 passes. Billets pressed at room temperature showed almost a 4 fold increase in the yield strength, which increased to about 320 MPa from about 90 MPa, while it increased to about 230 MPa in billets deformed at cryogenic temperature. At two deformation temperatures, grains were refined at more or less similar size reduction rate as a function of number of passes. However, for a given amount of strain, billets pressed at the two temperatures showed subtle differences in their microstructures and texture.

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.

scholarly journals SPOT WELDING COPPER–1%Cr ELECTRODE TIPS PRODUCED VIA EQUAL CHANNEL ANGULAR PRESSING

2010 ◽  
Vol 9 (2) ◽  
pp. 1-10
Author(s):  
Luay Bakir Hussain ◽  
Ali Abadi Aljubori ◽  
Mohamad M Gebril ◽  
NUrulakmal Mohammed Sharif
Keyword(s):  
Equal Channel Angular Pressing ◽  
Spot Welding ◽  
Room Temperature ◽  
Pure Copper ◽  
Outer Part ◽  
Work Piece ◽  
Chromium Alloy ◽  
Angular Pressing ◽  
Welding Electrode ◽  
Number Of Passes

A sharp 120o Equal channel angular pressing (ECAP) following rout Bc was applied at room temperature to refine the grains sizes of pure copper and copper-1%Chromium alloy for spot welding electrode tips application. Initially deformation behavior was investigated with the position using colorful plasticine as work piece followed by copper alloy. It was found the deformation at the central part of the work piece is heavily sheared than the outer part. Optical and Scanning electron microscopy were used to study the progress of grain refining under the influence of rotation and number of passes during pressing. The influnece of elongated fibrous nano graines on electrical conductivity and hardness were discussed. Shear test of spot welded 303 stainless steel indicated that nano structural Cu-1%Cr electrode tips used showed a superior results compared to commercial electrodes

Low Cycle Fatigue Behaviour of Al-Mg-Si Alloy AA6061 Processed by Equal Channel Angular Pressing

2012 ◽  
Vol 463-464 ◽  
pp. 97-101
Author(s):  
C.V. Venkatesh ◽  
S. Ganesh Sundara Raman ◽  
Chakkingal Uday
Keyword(s):  
Equal Channel Angular Pressing ◽  
Room Temperature ◽  
Low Cycle Fatigue ◽  
Cyclic Hardening ◽  
Fatigue Behaviour ◽  
Cyclic Softening ◽  
Cycle Fatigue ◽  
Angular Pressing ◽  
Processed Material ◽  
Number Of Passes

The low cycle fatigue (LCF) behaviour of aluminium-magnesium-silicon alloy AA6061 processed by equal channel angular pressing (ECAP) was studied. Solutionized specimens of the alloy were subjected to one, two and three passes of ECAP at room temperature using route Bc. Compared to the values of the solutionized material an overall increase in yield strength and ultimate tensile strength with decrease in % elongation is observed for the ECAP processed material. While the solutionized material exhibits cyclic hardening at all strain levels, the ECAP processed material shows different behaviour depending on the number of passes - stable response/cyclic softening/ softening followed by hardening. The ECAP processed material after three passes exhibit superior LCF lives at low strains presumably due to higher strength and large refinement of grains.

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