Influence of microstructure and strengthening mechanism of AlMg5–Al 2 O 3 nanocomposites prepared via spark plasma sintering

Babu, N. Kishore; Kallip, Kaspar; Leparoux, Marc; AlOgab, Khaled A.; Maeder, Xavier; Dasilva, Yadira Arroyo Rojas

doi:10.1016/j.matdes.2016.01.138

Cited by 55 publications

(17 citation statements)

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“…Clustered as well as dispersed nanosized Al 2 O 3 reinforced particles at grain boundaries and grain interiors of AlMg5–0.5Al 2 O 3 samples were reported in our previous work . High activity of aluminum matrix due to fine grain size and high defect density, the presence of carbon source from the SA and driving force offered by thermal energy during hot pressing, has resulted in the formation of Al 4 C 3 nanophase in AlMg5‐M and AlMg5–0.5Al 2 O 3 samples as shown in TEM micrographs . Al 2 O 3 nanoparticles present in the AlMg5‐M samples could be attributed to the oxidation of highly chemically active Al atoms during milling and consolidation processes .…”

Section: Resultsmentioning

confidence: 55%

Microstructure, Mechanical, and Impression Creep Properties of AlMg5–0.5 vol% Al₂O₃ Nanocomposites

et al. 2016

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Microstructural and impression creep properties of hot pressed bulks made from unmilled AlMg5 powders, milled AlMg5, and AlMg5 powders milled with 0.5 vol% of Al 2 O 3 nanoparticles are investigated. Microstructural, high-temperature impression creep, and high-temperature tensile properties investigation is carried out. Activation energies and stress exponent values are determined from the steady state creep rate obtained at different temperatures and creep stresses. AlMg5-0.5 vol% Al 2 O 3 samples display superior strength values at 298 K compared to unmilled AlMg5 and milled AlMg5 samples. However, AlMg5-0.5 vol% Al 2 O 3 nanocomposite exhibits higher creep rate and tensile elongation with a decrease in strength at 473 K due to activation of grain boundary sliding mechanism.

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Section: Resultsmentioning

confidence: 55%

Microstructure, Mechanical, and Impression Creep Properties of AlMg5–0.5 vol% Al₂O₃ Nanocomposites

et al. 2016

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“…With regards to small cross sections at the contact points between particles, the local pressure can increase more than 1000 times relative to the first applied pressure that is around 50 MPa. The high current densities applied during SPS can result in efficient Joule heating, so the temperature at the contact points can reach 5000°C (Asgharzadeh et al ., ; Babu et al ., ). In this situation (with the presence of high pressure and temperature), the agglomerates break and some densification mechanisms such as plastic deformation or power‐law creep, are active.…”

Section: Resultsmentioning

confidence: 97%

“…However, the microstructures of both the nanocomposites revealed a bimodal aluminium grain structure in which both fine and coarse grains exists. These finding are consistent with the results presented in literature (Babu et al ., ). Accordingly, it can thus be stated that the formation of bimodal sized grains structure affect the mechanical properties such as hardness and strength, as reported in our previous work (Sadeghi et al ., ,b).…”

Section: Resultsmentioning

confidence: 97%

“…It was shown that the presence of the microclusters and agglomerated clusters of the alumina nanoparticle act as stimulated sites for nucleation via PSN. Additionally, it had been indicated that alumina nanoparticles develop high strain regions that allow to decrease the required energy for the nucleation of recrystallised grains via DDRX (Babu et al ., ). It is known that the driving force for the initiation of DRX is the stored strain induced via localised strain around the reinforcements.…”

Section: Resultsmentioning

confidence: 97%

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Electron backscattered diffraction analysis of friction stir processed nanocomposites produced via spark plasma sintering

Sadeghi

Cavaliere

Shamanian

et al. 2018

Journal of Microscopy

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In the present study, Spark Plasma Sintered (SPSed) aluminium matrix composites were severely deformed through Friction stir processing (FSP). Pure aluminium powders and bimodal sized Al O particles (80 nm and 25 μm) were firstly mixed by ball milling and then consolidated by spark plasma sintering. The effect of the heat input as well the bimodal particle size of the alumina on the materials' microstructure and texture development was evaluated by electron back scattered diffraction (EBSD) analysis. The EBSD analysis clearly showed that the SPSed nanocomposites possessed bimodal aluminium matrix grain structure as well as a crystallography characterised by random texture. In addition, microstructural examination revealed that the partial recrystallisation occurred during SPS for all the nanocomposites. Also, it is revealed that the Zener pinning effect of Al O nanoparticles retarded recrystallised grain growth following recrystallisation during FSP and then leading to grain refinement of the aluminium. The results revealed that the heat generated during FSP has a remarkable effect on the grain distribution as well as on the crystallographic orientation. Also, a mixture of {112} <110> shear elements and an ideal strong B/B¯ component were observed. The microstructural changes, occurred during FSP in the stir zone region for Al-Al O nanocomposites, were attributed to both the discontinuous along with the continuous recrystallisation (DDRX/CDRX). It should be pointed out that with increasing the heat input, recrystallised grains portion increased.

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“…One approach for the higher effectiveness of planetary milling could be adjusting the shape of the milling vessel. Therefore, ball milling in cubic shaped vessel was investigated . For instance, the same powder composition AlMg5–1 vol% nano‐Al 2 O 3 was milled under the same conditions in a Retsch mill PM400 and in the Cube‐mill a joint development from the companies TSB (Germany) and Reishauer AG (Switzerland).…”

Section: Processing − Solid State and Near Net Shapementioning

confidence: 99%

Solid State Processing of Aluminum Matrix Composites Reinforced with Nanoparticulate Materials

et al. 2018

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A simple powder metallurgy route is investigated at Empa for producing aluminum matrix nanocomposites. High energy ball milling has proven to be an efficient method for dispersing the nanoparticles into the matrix even up to high amount. The compaction of these blends at moderate temperature leads to dense nanocomposite materials with high strength whatever the nature of the reinforcement. Hot pressing, spark plasma sintering, and hot isostatic pressing induce the same tensile properties at rupture but higher yield strength can be observed for the simple hot pressing process. High strength can be only combined with high ductility for nanoparticle content below 1 vol%. These outstanding properties are achieved thanks to a homogenous nanoparticle dispersion as well as a bimodal grain size distribution with fine (<300 nm) and coarser grains (a few microns). The materials do not require subsequent heat or work hardening treatment and exhibit better or similar properties as the conventional high strength aluminum alloys. Finally, it is demonstrated that friction stir welding is a valuable process for joining these nanocomposites.

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Influence of microstructure and strengthening mechanism of AlMg5–Al 2 O 3 nanocomposites prepared via spark plasma sintering

Cited by 55 publications

References 36 publications

Microstructure, Mechanical, and Impression Creep Properties of AlMg5–0.5 vol% Al₂O₃ Nanocomposites

Microstructure, Mechanical, and Impression Creep Properties of AlMg5–0.5 vol% Al₂O₃ Nanocomposites

Electron backscattered diffraction analysis of friction stir processed nanocomposites produced via spark plasma sintering

Solid State Processing of Aluminum Matrix Composites Reinforced with Nanoparticulate Materials

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Influence of microstructure and strengthening mechanism of AlMg5–Al 2 O 3 nanocomposites prepared via spark plasma sintering

Cited by 55 publications

References 36 publications

Microstructure, Mechanical, and Impression Creep Properties of AlMg5–0.5 vol% Al2O3 Nanocomposites

Microstructure, Mechanical, and Impression Creep Properties of AlMg5–0.5 vol% Al2O3 Nanocomposites

Electron backscattered diffraction analysis of friction stir processed nanocomposites produced via spark plasma sintering

Solid State Processing of Aluminum Matrix Composites Reinforced with Nanoparticulate Materials

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Microstructure, Mechanical, and Impression Creep Properties of AlMg5–0.5 vol% Al₂O₃ Nanocomposites

Microstructure, Mechanical, and Impression Creep Properties of AlMg5–0.5 vol% Al₂O₃ Nanocomposites