Characterization of Mechanically Alloyed Al5083 Alloy and Composite and Consolidation by Equal Channel Angular Pressing

2015 ◽  
Vol 764-765 ◽  
pp. 23-27 ◽  
Author(s):  
G. Kondaiah ◽  
K. Chandra Sekhar ◽  
B. Chaithanyakrushna ◽  
Balasubramanian Ravisankar ◽  
S. Kumaran
Keyword(s):  
Equal Channel Angular Pressing ◽  
Back Pressure ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Composite Powders ◽  
Oxide Powders ◽  
Angular Pressing ◽  
Al 5083 Alloy ◽  
Milled Powders

In the present work a comparative study was carried out on consolidation of Al-5083 alloy and 5wt. % nanoyttrium oxide powders by Equal channel angular pressing (ECAP). The powders were milled for 10, 15 and 20 hrs using planetary ball mill under optimized process parameters. The milled powders were characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Milled powders exhibit nanocrystalline single phase after 10hrs. The crystallite size after 20 hr of milling, alloy and composite powders were found to be 23nm and 57nm respectively. The 20hr milled alloy and composite powder was consolidated by equal channel angular pressing (ECAP) through 90o die channel angle using route-A for two passes with and without back pressure. Density of ECAPed samples were measured using Archimedes principle. The highest density was found as 96% for the alloy after 2 passes without backpressure and sintering and 94% for the composite after 2 passes with back pressure and sintering.

Densification of Mechanically Alloyed Al5083-5wt% Y2O3 Nano Composite by Equal Channel Angular Pressing

2014 ◽  
Vol 592-594 ◽  
pp. 963-967
Author(s):  
Pravir Polly ◽  
K. Chandra Sekhar ◽  
Balasubramanian Ravisankar ◽  
S. Kumaran
Keyword(s):  
Equal Channel Angular Pressing ◽  
Single Phase ◽  
Milled Powder ◽  
High Energy ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Nano Composite ◽  
Angular Pressing ◽  
Energy Ball ◽  
Milled Powders

In the present work, Al-5083-5wt% nanoyttria powders were milled for 10, 20, 30 and 35 hrs in a high energy ball milling under optimised process parameters. The milled powders were characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Milled powders exhibit nanocrystalline single phase after 10hrs of milling. Consolidation of 35 hrs milled powder was done by equal channel angular pressing (ECAP) through 90odie channel angle using route A upto three passes with and without back pressure and sintered under controlled environment. Density of ECAPed samples was measured using Archimedes principle. The density is 96% for the sample consolidated with backpressure after two passes after sintering.

Densification and Consolidation of Al 5083 Alloy Powder by Equal Channel Angular Pressing

2014 ◽  
Vol 592-594 ◽  
pp. 112-116 ◽  
Author(s):  
Kondaiah Gudimetla ◽  
B. Chaithanyakrushna ◽  
K. Chandra Sekhar ◽  
Balasubramanian Ravisankar ◽  
S. Kumaran
Keyword(s):  
Alloy Powder ◽  
Physical And Mechanical Properties ◽  
Back Pressure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Angular Pressing ◽  
Al 5083 Alloy ◽  
Particle Size And Morphology ◽  
Size And Morphology ◽  
Hardness Values

In this present work the elemental powders pertaining to composition of Al5083 alloy was milled using planetary ball mill (Insmart systems) for 20 h. The elemental powders are loaded in HSS vial with 10:1 ball to powder ratio at 250 RPM. Various parameters such as crystalline size, particle size and morphology have studied using X-ray diffraction analysis and scanning electron microscopy. The crystallite size of the powders determined using Williamson Hall analysis of XRD is 23 nm after 20 h of milling. These nanocrystalline Al-5083 alloy powders were consolidated using ECAP with and without application of back pressure. Physical and mechanical properties such as density and hardness values were measured for sintered and unsintered samples.

Effect of Equal Channel Angular Pressing on Densification Behavior of Al 5083 Alloy Powder

2015 ◽  
Vol 830-831 ◽  
pp. 63-66 ◽  
Author(s):  
Kondaiah Gudimetla ◽  
Ganesh Varma Jampana ◽  
S. Ramesh Kumar ◽  
Balasubramanian Ravisankar ◽  
S. Kumaran
Keyword(s):  
Equal Channel Angular Pressing ◽  
Physical And Mechanical Properties ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Angular Pressing ◽  
Al 5083 Alloy ◽  
Energy Ball ◽  
Particle Size And Morphology ◽  
Size And Morphology

In this present study Al-5083 alloy powders were prepared from elemental powders using high energy ball milling under optimized milling parameters. Various properties such as crystalline size, particle size and morphology have been studied using X-Ray diffraction analysis and Scanning Electron Microscopy. It was found that Al-5083 alloy was formed and nanocrystalline size particles were achieved. These nanocrystalline Al-5083 alloy powders were consolidated using equal channel angular pressing with and without application of back pressure. Physical and mechanical properties such as density and hardness are studied.

Effect of Milling Time on Consolidation of Al5083 Nanocomposite by Equal Channel Angular Pressing

2019 ◽  
Vol 969 ◽  
pp. 662-668
Author(s):  
K. Chandra Sekhar ◽  
Y. Umamaeshwar Rao ◽  
Balasubramanian Ravisankar ◽  
S. Kumaran
Keyword(s):  
Milling Time ◽  
Lattice Strain ◽  
Milled Powder ◽  
Nanocrystalline Structure ◽  
Back Pressure ◽  
Maximum Hardness ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Powders ◽  
Angular Pressing

The effect of milling time on consolidation of Al5083-5wt. % nanoyttrium oxide powders which are milled from 0-35 hours using planetary ball mill. nanocrystalline structure was observed after 10hours of milling. X-ray diffraction results reveals the formation of 57nm and 31nm for 20hr and 35hr of milling with increase in lattice strain. Circular and Elliptical morphology of milled powders were confirmed through SEM with decrease in particle size. The 90o die channel angle ECAP die was used to consolidate 20hr and 35hr milled powder aided with and without back pressure. The optical micrographs reveal the formation of fine grains. The35hr milled powder shows the maximum densification of 96% and 20hr milled powder shows maximum hardness of 82HRB was observed in 20hr milled powder. Both are consolidated for two passes in route-A and sintered at 430°C for one hour.

scholarly journals Structural and hydrogen storage characterization of nanocrystalline magnesium synthesized by ECAP and catalyzed by different nanotube additives

2021 ◽  
Vol 60 (1) ◽  
pp. 884-893
Author(s):  
Ádám Révész ◽  
Dániel G. Fodor ◽  
György Krállics ◽  
Tony Spassov ◽  
Marcell Gajdics
Keyword(s):  
Average Crystallite Size ◽  
Hydrogen Desorption ◽  
Titanate Nanotubes ◽  
X Ray Diffraction ◽  
Microstructural Characteristics ◽  
Microstructural Parameters ◽  
Storage Performance ◽  
Average Dislocation Density ◽  
Angular Pressing

Abstract Ball-milled nanocrystalline Mg powders catalyzed by TiO2 powder, titanate nanotubes and carbon nanotubes were subjected to intense plastic deformation by equal-channel angular pressing. Microstructural characteristics of these nanocomposites have been investigated by X-ray diffraction. Microstructural parameters, such as the average crystallite size, the average dislocation density and the average dislocation distance have been determined by the modified Williamson–Hall analysis. Complementary hydrogen desorption and absorption experiments were carried out in a Sieverts’ type apparatus. It was found that the Mg-based composite catalyzed by titanate nanotubes exhibits the best overall H-storage performance, reaching 7.1 wt% capacity. The hydrogenation kinetic curves can be fitted by the contracting volume function for all the investigated materials. From the fitted parameters, it is confirmed that the titanate nanotube additive results in far the best kinetic behavior, including the highest hydride front velocity.

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