Fabrication of Fullerene-Reinforced Aluminum Matrix Nanocomposites

Asgharzadeh, H.; Faraghi, Hamid; Kim, Hyoung Seop

doi:10.1007/s40195-017-0629-9

Cited by 21 publications

(15 citation statements)

References 34 publications

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“…This general effect was reported in the very early experiments of Bridgman [34] where it was claimed that finely divided powder emerges as a homogeneous disc after shearing. In fact, there are many reports of the consolidation of metallic particles by HPT [23,35,36,37,38,39,40,41,42] and initial observations of the processed discs suggest a full consolidation. Earlier reports described good consolidation of pure magnesium machining chips [25,43] after only five turns of HPT.…”

Section: Discussionmentioning

confidence: 99%

Magnesium-Based Bioactive Composites Processed at Room Temperature

et al. 2019

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Hydroxyapatite and bioactive glass particles were added to pure magnesium and an AZ91 magnesium alloy and then consolidated into disc-shaped samples at room temperature using high-pressure torsion (HPT). The bioactive particles appeared well-dispersed in the metal matrix after multiple turns of HPT. Full consolidation was attained using pure magnesium, but the center of the AZ91 disc failed to fully consolidate even after 50 turns. The magnesium-hydroxyapatite composite displayed an ultimate tensile strength above 150 MPa, high cell viability, and a decreasing rate of corrosion during immersion in Hank’s solution. The composites produced with bioactive glass particles exhibited the formation of calcium phosphate after 2 h of immersion in Hank’s solution and there was rapid corrosion in these materials.

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Section: Discussionmentioning

confidence: 99%

Magnesium-Based Bioactive Composites Processed at Room Temperature

et al. 2019

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“…Early reports examined the consolidation of pure aluminum and copper, [1,2] a nanocrystalline alloy, [3,4] and amorphous alloys. [4][5][6][7][8] It is also possible to incorporate hard phase particles into the metals, producing metal matrix composites [1,2,[9][10][11][12][13] that usually display improved strength compared to their metal counterparts.…”

Section: Introductionmentioning

confidence: 99%

Inverse Hall–Petch Behaviour in an AZ91 Alloy and in an AZ91–Al₂O₃ Composite Consolidated by High‐Pressure Torsion

et al. 2019

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High-pressure torsion (HPT) is a significant procedure for achieving substantial grain refinement but it may be used also to consolidate metallic particles to form bulk samples or composites where two (or more) different phases are mixed and consolidated. Herein, the consolidation of particles of the magnesium AZ91 alloy and a composite with an AZ91 matrix combined with 1% alumina powder is investigated. The results show that it is possible to fully consolidate this alloy after a large number of turns. As a consequence of the severe plastic deformation, the grain structure is significantly refined, with average grain sizes of %116 and %98 nm in the unreinforced alloy after 20 or 50 HPT turns and %76 nm in the composite after 50 HPT turns, respectively. This grain refinement is associated with a decrease in hardness and an increase in the strain rate sensitivity due to the onset of a grain boundary diffusion-assisted creep mechanism at room temperature. The results are consistent with the theoretical prediction of a breakdown in the Hall-Petch relationship at very small grain sizes.

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“…[19][20][21] It has been shown that the incorporation of inert particles to produce a composite using HPT consolidation leads to smaller grain sizes than those observed in pure metals. [22][23][24] Thus, these results show that the incorporation of HA particles enhances the grain refinement induced by HPT processing of pure Mg. Figure 2a shows the OCP of the Mg-HA composite as a function of immersion time in Hank's solution. A curve obtained for pure Mg processed by HPT is also shown for comparison.…”

Section: Characterization Of the Compositementioning

confidence: 52%

Corrosion Behavior in Hank's Solution of a Magnesium–Hydroxyapatite Composite Processed by High‐Pressure Torsion

et al. 2020

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It is known that magnesium (Mg)-hydroxyapatite (HA) composites can be produced by the room temperature consolidation of particles. Herein, the corrosion behavior of an Mg-HA composite is analyzed, and a direct comparison with pure Mg is made. Samples of Mg-HA and of pure Mg are immersed in Hank's solution for up to 60 h, and the microstructure and corrosion products are characterized by scanning and transmission electron microscopy and X-ray diffraction. Electrochemical tests are used to evaluate the corrosion behavior and a hydrogen evolution test is undertaken to determine the corrosion rate. The results show the corrosion rate of the Mg-HA composite is higher than for pure Mg but decreases significantly after %10 h of immersion in Hank's solution. The increase in corrosion resistance of the composite is attributed to the formation of a protective layer of corrosion products with an external surface layer rich in Ca, P, and O.

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Fabrication of Fullerene-Reinforced Aluminum Matrix Nanocomposites

Cited by 21 publications

References 34 publications

Magnesium-Based Bioactive Composites Processed at Room Temperature

Magnesium-Based Bioactive Composites Processed at Room Temperature

Inverse Hall–Petch Behaviour in an AZ91 Alloy and in an AZ91–Al₂O₃ Composite Consolidated by High‐Pressure Torsion

Corrosion Behavior in Hank's Solution of a Magnesium–Hydroxyapatite Composite Processed by High‐Pressure Torsion

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Fabrication of Fullerene-Reinforced Aluminum Matrix Nanocomposites

Cited by 21 publications

References 34 publications

Magnesium-Based Bioactive Composites Processed at Room Temperature

Magnesium-Based Bioactive Composites Processed at Room Temperature

Inverse Hall–Petch Behaviour in an AZ91 Alloy and in an AZ91–Al2O3 Composite Consolidated by High‐Pressure Torsion

Corrosion Behavior in Hank's Solution of a Magnesium–Hydroxyapatite Composite Processed by High‐Pressure Torsion

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Inverse Hall–Petch Behaviour in an AZ91 Alloy and in an AZ91–Al₂O₃ Composite Consolidated by High‐Pressure Torsion