Interfacial valence electron localization and the corrosion resistance of Al-SiC nanocomposite

Mosleh-Shirazi, Sareh; Hua, Guomin; Akhlaghi, Farshad; Yan, Xianguo; Li, Dongyang

doi:10.1038/srep18154

Cited by 49 publications

(22 citation statements)

References 34 publications

(35 reference statements)

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“…This has been demonstrated by a recent study on TiC-Ni composite coatings with two sizes of TiC particles on micron and nanometer scales 27 . Effects of second phase’s size and morphology on the interfacial coherency and thus properties of a two-phase material are also reflected by EWF 27 28 . As observed in the study on TiC-Ni composite coatings, lower interfacial coherency (caused by large TiC particles embedded in Ni matrix) resulted in lowered EWF or electron localization at the interface.…”

Section: Resultsmentioning

confidence: 99%

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Electron work function–a promising guiding parameter for material design

Liu

Yan

et al. 2016

Sci Rep

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Using nickel added X70 steel as a sample material, we demonstrate that electron work function (EWF), which largely reflects the electron behavior of materials, could be used as a guide parameter for material modification or design. Adding Ni having a higher electron work function to X70 steel brings more “free” electrons to the steel, leading to increased overall work function, accompanied with enhanced e−–nuclei interactions or higher atomic bond strength. Young’s modulus and hardness increase correspondingly. However, the free electron density and work function decrease as the Ni content is continuously increased, accompanied with the formation of a second phase, FeNi3, which is softer with a lower work function. The decrease in the overall work function corresponds to deterioration of the mechanical strength of the steel. It is expected that EWF, a simple but fundamental parameter, may lead to new methodologies or supplementary approaches for metallic materials design or tailoring on a feasible electronic base.

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Section: Resultsmentioning

confidence: 99%

“…Such lowered EWF at interfaces deteriorates the resistance of materials to mechanical and electrochemical attacks 29 30 . However, the situation is reversed when the particle size is on nano-scale with elevated interfacial coherency 27 28 .…”

Section: Resultsmentioning

confidence: 99%

Electron work function–a promising guiding parameter for material design

Liu

Yan

et al. 2016

Sci Rep

Self Cite

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“…Moreover, the lowest EWF of a TiC surface is of (111) with Ti termination, with a value of 4.59 eV, which is still larger than 4.14 eV, the highest EWF of an Al surface. Although the TiC surfaces have higher EWF than the Al surfaces, the electrochemical potential depends on the overall work function [34]. In general, adding an element having a higher work function to a host metal with a lower work function may elevate overall work function [35], due to the increase in the valence or free electron density [36].…”

Section: Resultsmentioning

confidence: 99%

Microstructure, Corrosion and Mechanical Properties of TiC Particles/Al-5Mg Composite Fillers for Tungsten Arc Welding of 5083 Aluminum Alloy

Huang

Wang

et al. 2019

Materials

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A semi-solid stir casting mixed multi-pass rolling process was successfully employed to manufacture TiCp/Al-5Mg composite filler wires with different contents of TiC particles. The 5083-H116 aluminum alloys were joined by tungsten inert gas (TIG) using TiCp/Al-5Mg composite weld wires. The microstructure, mechanical properties, fractography and corrosion behavior of the welds were evaluated. The results revealed that TiC particles were distributed in the welds uniformly and effectively refined the primary α-Al grains. The hardness and tensile strength of the welds were improved by increasing the TiC particle content, which could be attributed to the homogeneous distribution of TiC particles and the microstructure in the weld joints. Potentiodynamic polarization testing revealed that the corrosion resistance of the welds also increased with the addition of TiC particle contents. In addition, the stress corrosion cracking (SCC) susceptibility of the welds decreased as micro-TiC particles were introduced into the welds. The electronic structure of the Al/TiC interface was investigated by first principle calculation. The calculation showed that valence electrons tended to be localized in the region of the TiC-Al interface, corresponding to an addition of the overall work function, which hinders the participation of electrons in the composite in corrosion reactions.

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“…Mostly, the silicon carbide (SiC) and alumina (Al 2 O 3 ) are used as reinforcement in AMCs. SiC particles alter the microstructural attributes of AMCs and elevate their strength [8].…”

Section: Introductionmentioning

confidence: 99%

Optimization of WEDM for precise machining of novel developed Al6061-7.5% SiC squeeze-casted composite

Ishfaq

Anwar

Ali

et al. 2020

Int J Adv Manuf Technol

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The emerging demands of industry for developing the novel materials with superior mechanical properties have successfully resulted in the development of distinct materials such as Al-matrix composites. Among these composites, newly developed Al6061-7.5% SiC holds promising mechanical characteristics. But, the SiC reinforcement in the Al-matrix makes the machining of this composite challenging, thus posing a serious concern regarding its effective utilization. In this research, high-speed wire electric discharge machining (WEDM) was employed for the precise machining of a squeeze casted Al6061-7.5% SiC composite. The cutting performance of the WEDM was assessed in terms of roughness (SR), cutting rate (Cs) and kerf width (KW). Experimentation was performed according to the response surface methodology. The experimental findings were thoroughly investigated using statistical, optical and scanning electron microscopic (SEM) analyses. It has been revealed that the voltage is most influential/contributing parameter (having a percentage contribution of 25%) for controlling the SR during WEDM of Al6061-7.5% SiC composite, whereas for the CS and KW, pulse and current are the major contributing control variables with percentage contributions of 90% and 84%, respectively. At low magnitude of both current and voltages, the surface quality is improved up to 33.3%. The SEM and optical microscopic evidences reveal shallow craters, small size melt re-deposits and micro globules on the machined surface at lower settings of both the said variables. Contrarily, for achieving higher cutting speed, high values of current and voltage along with low pulse are deemed essential. In case of KW, low magnitude of current and voltage along with smaller pulse yields 20% reduction in the kerf width. The analyses revealed the conflicting nature of the studied output responses (SR, Cs and KW). Therefore, multi-objective genetic algorithm (MOGA) was used to find a parametric combination. The best combination of WEDM input parameters found is current = 3 A, voltage = 84.999 V and pulse = 10 mu. This combination gives a minimum SR of 5.775 μm with a KW of 0.3111 mm at a CS of 5.885 mm/min. The suitability of the MOGA-proposed parametric combination was witnessed through confirmation trials. Furthermore, the parametric effects have also been mathematically quantified with respect to the defined machinability parameters.

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Interfacial valence electron localization and the corrosion resistance of Al-SiC nanocomposite

Cited by 49 publications

References 34 publications

Electron work function–a promising guiding parameter for material design

Electron work function–a promising guiding parameter for material design

Microstructure, Corrosion and Mechanical Properties of TiC Particles/Al-5Mg Composite Fillers for Tungsten Arc Welding of 5083 Aluminum Alloy

Optimization of WEDM for precise machining of novel developed Al6061-7.5% SiC squeeze-casted composite

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