Mechanical Properties and Wear Resistance of Semisolid Cast Al2O3 Nano Reinforced Hypo and Hyper-eutectic Al–Si Composites

El-Mahallawi, I.; Shash, Ahmed Y.

doi:10.1007/978-981-10-1602-8_2

Cited by 11 publications

(8 citation statements)

References 17 publications

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“…The results obtained in this work agree with some previous findings [21][22], suggesting incompatibility between mechanical properties, and wear resistance at high stress wear conditions for nanoreinforced steel. Similar results were observed by the authors on hypoeutectic AlSi alloys, but not for hypereutectic AlSi alloys [29].…”

Section: Resultssupporting

confidence: 90%

Investigating Wear Resistance of Low Carbon Steels Reinforced by Sic Submicron Sized Particles

Mattar¹,

El-Fawkhry

El-Mahallawi

2018

The International Conference on Applied Mechanics and Mechanica

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The development of new steel grades with improved mechanical properties by the addition of nanoparticles to microalloyed steels has recently gained attention. Misfit, size, thermal expansion coefficient, density, wettability and stability were reported to have an effect on the properties. The main challenge is the development of these nanostructured constituents by modified conventional and advanced manufacturing techniques. This work discusses the options for applying nanoinoculation techniques to produce new nanodispersed steel grades, with improved mechanical properties. At this stage of work submicron sized particles coated with Cu were selected in order to avoid wettability and agglomeration problems. The inoculant was added in different ratios starting from 0.025% up to 0.10% to the steel melt and the stirring of the melt was secured via the induction current heating for 4 minutes. The produced alloy was tapped in an iron ingot, and then hot forged into bars and plates. Optical microscopic studies were performed on the new material in order to identify the microstructural features. The wear abrasion resistance was detected using a wear test. It is shown that these new steel grades have improved wear friction coefficients; though higher wear rates at the studied load and time conditions. This opens a new path for investigations on the wear resistance of nanodispersed and nanoinoculated steels.---

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Section: Resultssupporting

confidence: 90%

Investigating Wear Resistance of Low Carbon Steels Reinforced by Sic Submicron Sized Particles

Mattar¹,

El-Fawkhry

El-Mahallawi

2018

The International Conference on Applied Mechanics and Mechanica

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“…However, bigger grain size offers low resistance to fatigue reaching the plastic deformation region. 22 Hall–Petch equation 23 shows the association between yield strength and the grain diameter (equation (4))where σy is yield stress, d is grain diameter, σ0 is stress upon the friction and k refers to a constant coefficient. 23 Based on this equation, increasing the grain diameter would end up in decreasing the yield stress.…”

Section: Methodsmentioning

confidence: 99%

“…where σ y is yield stress, d is grain diameter, σ 0 is stress upon the friction and k refers to a constant coefficient. 23 Based on this equation, increasing the grain diameter would end up in decreasing the yield stress. ASTM F138…”

Section: Grain Sizementioning

confidence: 99%

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Mechanical comparison of cold-worked versus cold-worked hot-forged dynamic hip screw system

Azhang

Abdollahi

Nikkhoo

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Purpose: Dynamic hip screw (DHS) plate fabrication has a crucial role in success rate of surgeries for fractures of the proximal femur. Our research focuses on comparing microstructure and mechanical properties of DHS plates fabricated through two distinct processes. We aimed to compare the mechanical cold-worked (CW) DHS plate versus a DHS plate that fabricated through the cold-worked hot-forged (CWH) DHS plate. Methods: The CW and CWH DHS plates had similar topology, however, tested under different loading scenarios. To make the results comparable, the test for the CW DHS plate was simulated and validated utilizing the finite element modeling (FEM) approach. Then, the model (i.e., the CW DHS plate) was analyzed applying the loading scenario of the CWH DHS plate test. Finally, the results of the FEM analysis for CW and the actual test for CWH DHS plates including compression bending stiffness/strength and proof load were compared. Furthermore, the chemical combination of the two plates was analyzed to investigate if they meet the requirements for ASTM F138 standard. Results: Our analysis showed the amount of “Proof Load” and “Compression Bending Strength” of the CWH DHS plate significantly improved by ∼87% in comparison with the CW DHS plate that both fabricated with ASTM F138 material. On comparison between their grain sizes, the CWH DHS plate has a finer grain size (∼55% smaller than CW DHS plate) which leads to larger yield stress. Conclusion: Although the cold-working process according to ASTM F138 leads to enhance the mechanical performance of a DHS plate, adding hot-forging to the process improved the mechanical performance of DHS plate. The outcome of this study could facilitate the development of the optimal fabrication process for surgical implants which in turn will increase the long-term success rate of the relevant surgeries.

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“…In the current scenario, the stir casting method is being adopted in the production of aluminum alloy components for aerospace and automobile applications [ 2 , 3 ]. The in situ stir casting method has been a good option as a production method, as reinforced AMC composites do have good bonding, less wettability, proper distribution of fillers and better mechanical properties [ 4 , 5 , 6 ]. The aluminum matrix composites have been synthesized using various fillers, such as SiC, graphite, ZrB 2 , TiB 2 and Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Assessments of Process Parameters on Cutting Force and Surface Roughness during Drilling of AA7075/TiB2 In Situ Composite

et al. 2021

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Reinforced aluminum composites are the basic class of materials for aviation and transport industries. The machinability of these composites is still an issue due to the presence of hard fillers. The current research is aimed to investigate the drilling topographies of AA7075/TiB2 composites. The samples were prepared with 0, 3, 6, 9 and 12 wt.% of fillers and experiments were conducted by varying the cutting speed, feed, depth of cut and tool nose radius. The machining forces and surface topographies, the structure of the cutting tool and chip patterns were examined. The maximum cutting force was recorded upon increase in cutting speed because of thermal softening, loss of strength discontinuity and reduction of the built-up-edge. The increased plastic deformation with higher cutting speed resulted in the excess metal chip. In addition, the increase in cutting speed improved the surface roughness due to decrease in material movement. The cutting force was decreased upon high loading of TiB2 due to the deterioration of chips caused by fillers. Further introduction of TiB2 particles above 12 wt.% weakened the composite; however, due to the impact of the microcutting action of the fillers, the surface roughness was improved.

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Mechanical Properties and Wear Resistance of Semisolid Cast Al2O3 Nano Reinforced Hypo and Hyper-eutectic Al–Si Composites

Cited by 11 publications

References 17 publications

Investigating Wear Resistance of Low Carbon Steels Reinforced by Sic Submicron Sized Particles

Investigating Wear Resistance of Low Carbon Steels Reinforced by Sic Submicron Sized Particles

Mechanical comparison of cold-worked versus cold-worked hot-forged dynamic hip screw system

Assessments of Process Parameters on Cutting Force and Surface Roughness during Drilling of AA7075/TiB2 In Situ Composite

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