scholarly journals Corrosion Behavior of Commercial Aluminum Alloy Processed by Equal Channel Angular Pressing

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Atef Korchef ◽  
Abdelkrim Kahoul
Keyword(s):  
Aluminum Alloy ◽  
Equal Channel Angular Pressing ◽  
Corrosion Behavior ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
Electrochemical Tests ◽  
Commercial Aluminum Alloy ◽  
Enhanced Dissolution ◽  
Galvanic Cells ◽  
Angular Pressing

A commercial aluminum alloy was subjected to severe plastic deformation through equal channel angular pressing (ECAP). The alloy contains a low volume fraction ofα-AlFeSi located essentially at the grain boundaries. The corrosion behavior of the ECAP’ed alloy was investigated in NaCl solution using potentiodynamic polarization and immersion tests. The effects of scan rate and NaCl concentration on the alloy susceptibility to corrosion were also studied. The results obtained were compared with those of the nonpressed alloy. ECAP leads to an intensive grain refinement accompanied by an increased dislocation density. All electrochemical tests confirm that corrosion resistance of the alloy remarkably diminished with increasing the ECAP number of passes. This is presumably due to the breakdown of theα-AlFeSi after ECAP leading to higher number of galvanic cells and enhanced dissolution of the aluminum matrix.

Study of Sintering of Iron Powder Bars Processed by Equal Channel Angular Pressing

2014 ◽  
Vol 802 ◽  
pp. 404-408 ◽  
Author(s):  
Mônica Paula Ribeiro ◽  
Marcio Ferreira Hupalo ◽  
Selauco Vurobi ◽  
Osvaldo Mitsuyuki Cintho
Keyword(s):  
Iron Powder ◽  
Equal Channel Angular Pressing ◽  
Volume Fraction ◽  
Substantial Reduction ◽  
Microstructural Characterization ◽  
Porosity Evolution ◽  
Angular Pressing ◽  
Internal Angle ◽  
Quantitative Stereology ◽  
1045 Steel

The main aim of this work is to show porosity evolution during application of various processing conditions to a high-purity (99.7 wt.%) iron powder, including compacting, sintering and equal channel angular pressing (ECAP). Iron powder bars with dimensions of 8x8x30 mm and 8x8x10 mm were axially pressed with pressures ranging from 100MPa to 250MPa, followed by sintering at 1100oC during 30 minutes under argon atmosphere. Sintered bars were processed by ECAP at room temperature in a single pass, using a SAE 1045 steel die with an internal angle of 120o. Microstructural characterization was performed by light optical microscopy (LOM) and quantitative stereology. ECAP processing resulted in a substantial reduction in the porosity levels for specimens pressed at 100 MPa and 150 MPa. The sample compacted with 150MPa and processed by ECAP with back-pressure showed the lowest volume fraction of porosity. Higher compacting pressures caused an increase in porosity levels. This result is explained by presence of cracks prior to ECAP and the concurrent action of severe stress-strain states during extrusion.

Effect of small alloying additions on mechanical properties of sintered Al—Sn composites

2021 ◽  
pp. 2-9
Author(s):  
N. M. Rusin ◽  
◽  
A. L. Skorentsev ◽  
Keyword(s):  
Mechanical Properties ◽  
Liquid Phase ◽  
Equal Channel Angular Pressing ◽  
Aluminum Matrix ◽  
Liquid Phase Sintering ◽  
Plastic Properties ◽  
Aluminum Powders ◽  
Alloying Additions ◽  
Angular Pressing ◽  
Alloying Additives

Composites of the Al—Sn system obtained by liquid-phase sintering of a mixture of doped aluminum powders with tin powder have been investigated. It was found that a small amount of alloying additives (Zn, Mg, Si, Cu) contributed to a considerable strengthening of the aluminum matrix when processing it by the method of equal channel angular pressing, but at the same time reduced the plastic properties. Samples alloyed with 2% Cu demonstrate the maximum strength and minimum ductility.

Corrosion Behavior of Al-7wt% Si-1.5wt% Cu Severely Deformed by Equal-Channel Angular Pressing

2007 ◽  
pp. 2892-2897
Author(s):  
Zuo Gui Zhang ◽  
Eiji Akiyama ◽  
Yoshimi Watanabe ◽  
Yasuyuki Katada ◽  
Kaneaki Tsuzaki
Keyword(s):  
Equal Channel Angular Pressing ◽  
Corrosion Behavior ◽  
Angular Pressing

scholarly journals Increase in the Mechanical Strength of Mg-8Gd-3Y-1Zn Alloy Containing Long-Period Stacking Ordered Phases Using Equal Channel Angular Pressing Processing

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 221 ◽  
Author(s):  
Gerardo Garces ◽  
Pablo Pérez ◽  
Rafael Barea ◽  
Judit Medina ◽  
Andreas Stark ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Yield Stress ◽  
Equal Channel Angular Pressing ◽  
Volume Fraction ◽  
Extrusion Direction ◽  
Grain Structure ◽  
Long Period ◽  
Angular Pressing ◽  
Β Phase ◽  
Ordered Phases

The evolution of the microstructure and mechanical properties during equal channel angular pressing processing has been studied in an extruded Mg-Gd-Y-Zn alloy containing long-period stacking ordered phases. After extrusion, the microstructure is characterized by the presence of long-period stacking ordered fibers elongated along the extrusion direction within the magnesium matrix. The grain structure is a mixture of randomly oriented dynamic recrystallized and coarse highly oriented non-dynamic recrystallized grains. Rare-earth atoms are in solid solution after extrusion at 400 °C and precipitation takes place during the thermal treatment at 200 °C. Precipitation of β’ prismatic plates and lamellar γ’ in the basal plane increases the tensile yield stress from 325 to 409 MPa. During equal channel angular pressing processing at 300 °C, the volume fraction of dynamic recrystallized grains continuously increases with the strain introduced during the equal channel angular pressing process. Precipitation of β phase is equally observed at grain boundaries of the ECAPed alloy. Dynamic recrystallized grain size decreases from 1.8 µm in the extruded material to 0.5 µm in the ECAPed alloy. Thermal treatment at 200 °C of ECAPed materials results in an increase of the yield stress up to 456 MPa, which is maintained up to 200 °C.

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.

Microstructural Characterization of an Al-Mg-Si Aluminum Alloy Processed by Equal Channel Angular Pressing

2013 ◽  
Vol 745-746 ◽  
pp. 303-308
Author(s):  
Zhen Zhang ◽  
Man Ping Liu ◽  
Ying Da Yu ◽  
Pål C. Skaret ◽  
Hans Jørgen Roven
Keyword(s):  
Aluminum Alloy ◽  
Electron Microscope ◽  
High Resolution ◽  
Dislocation Density ◽  
Equal Channel Angular Pressing ◽  
Transmission Electron Microscope ◽  
Microstructural Characterization ◽  
Dark Field ◽  
Angular Pressing ◽  
Transmission Electron

In the present work, a peak-aged 6061 Al-Mg-Si aluminum alloy was subjected to equal channel angular pressing (ECAP) at 110 °C. The microstructure of the sample was characterized by high-resolution transmission electron microscope and weak-beam dark-field method. It was shown that the dislocation density in some local areas is much lower than the average dislocation density expected in the usual alloys processed by severe plastic deformation. High-resolution transmission electron microscope observations indicated that many full dislocations were dissociated into partial dislocations connected by stacking faults. In addition, a Z-shaped defect (i.e., a type of dislocation locks) probably formed by the reactions of the partials in different {111} planes was first observed in the ECAPed alloy. Furthermore, the precipitation behavior and sequence in the present ECAPed sample were identified by high-resolution transmission electron microscopy.

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