A Critical Review on Heat Treatment of Aluminium Alloys

Kumar, N. M. Siddesh; Dhruthi,; Pramod, G.K.; Samrat, P.; Sadashiva, M.

doi:10.1016/j.matpr.2021.12.586

Cited by 48 publications

(11 citation statements)

References 30 publications

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“…An Al matrix can be precipitation-strengthened via micro-alloying with Sc, where the strength is improved by heat treatment aging [ 12 ]. Many studies have identified some substitutional elements, i.e., Zr and Ti, for Sc in the Al–Sc-based alloys to decrease the use of the expensive Sc, increase the ambient strength and increase the service temperature while maintaining a high strength [ 31 , 32 , 33 ]. Therefore, in general, the micro-addition of Zr is a highly attractive strategy in lowering the cost.…”

Section: Resultsmentioning

confidence: 99%

Homogeneous Age-hardening of Large-sized Al-Sc Foams via Micro-alloying with Zr and Ti

Chu,

Wang,

Yang

et al. 2024

Materials

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Al-based foams have drawn increasing attention from industry due to their integration of structure and functional properties. However, large-sized Al-based foams still cannot be homogeneously strengthened by long-time aging due to their low thermal conductivity. In this study, we proposed an age-hardening approach that was applied in large-sized Al-0.16Sc-0.17Zr (wt.%) foams via micro-alloying with Zr and Ti compared with Al-0.21Sc foams; it not only achieved homogeneous strength by long-term aging but also reduced the cost of the alloy by substituting Zr and Ti for the more expensive Sc content. The results show that the Al3(Sc, Zr, Ti) phase with a core–shell structure as a crucial precipitation strengthening phase by micro-alloying with Zr and Ti was less prone to coarsening after a prolonged aging heat treatment. Therefore, the yielding strength of Al-Sc foam micro-alloying with Zr and Ti remained almost unchanged after a maximum aging time of 1440 h due to less coarsening precipitate, which is consistent with the results of mechanical experiments. These findings provide a new way for the heat treatment strengthening of large-sized Al-based foams, thus promoting their industrial applications.

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Section: Resultsmentioning

confidence: 99%

Homogeneous Age-hardening of Large-sized Al-Sc Foams via Micro-alloying with Zr and Ti

Chu,

Wang,

Yang

et al. 2024

Materials

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“…However, in the present study, the base material was represented by quite large pieces, several mm in size. Furthermore, even when strain hardened, highly refined aluminum was characterized by extremely high ductility and formability along with low strength, in contrast with the Al–Zn and Al–Cu series of alloys, e.g., ‘AA 7075’ and ‘AA 2024’ grades, characterized with high hardness (due to precipitation hardening) and significant size reduction during ball milling [ 106 , 107 , 108 , 109 ].…”

Section: Resultsmentioning

confidence: 99%

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Buryakovskaya,

Maslakov,

Borshchev

et al. 2024

Molecules

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A swarf of aluminum alloy with high corrosion resistance and ductility was successfully converted into fine hydro reactive powders via ball milling with silver powder and either lithium chloride or gallium. The latter substances significantly intensified particle size reduction, while silver formed ‘cathodic’ sites (Ag, Ag2Al), promoting Al corrosion in aqueous saline solutions with hydrogen generation. The diffraction patterns, microphotographs, and elemental analysis results demonstrated partial aluminum oxidation in the samples and their contamination with tungsten carbide from milling balls. Those factors were responsible for obtaining lower hydrogen yields than expected. For AlCl3 solution at 60 °C, Al–LiCl–Ag, Al–LiCl, Al–Ga–Ag, and Al–Ga composites delivered (84.6 ± 0.2), (86.8 ± 1.4), (80.2 ± 0.5), and (76.7 ± 0.7)% of the expected hydrogen, respectively. Modification with Ag promoted Al oxidation, thus providing higher hydrogen evolution rates. The samples with Ag were tested in a CaCl2 solution as well, for which the reaction proceeded much more slowly. At a higher temperature (80 °C) after 3 h of experiment, the corresponding hydrogen yields for Al–LiCl–Ag and Al–Ga–Ag powders were (46.7 ± 2.1) and (31.8 ± 1.9)%. The tested Ag-modified composite powders were considered promising for hydrogen generation and had the potential for further improvement to deliver higher hydrogen yields.

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“…Lower thickness ZnO thin films exhibit higher transmittance, whereas ZnO thin films with numerous grain boundaries or small grain sizes exhibit higher optical scattering and lower transmittance. As shown in Figure 7, the ZnO thin film created from the 0.1 M Zn 2+ solution has the highest transparency and as a result, the decrease in transmittance [81]. VI.…”

Section: E Surface Morphology Of the Coatingmentioning

confidence: 98%

Modern Smart Street Light Monitoring Systems

Kalal,

et al. 2023

IJRASET

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This study highlights the importance of Modern Street light control systems over traditional ones, with LED lamps emerging as the most suitable choice due to their advantagessuch as reduced heat production, lower electricity consumption, and extended lifespan. The main goal is to enhance system efficiency by minimizing unnecessary electricity loss during daylight and when lighting is not required. Automating street lights using LDR and PIR sensorsin conjunction with Arduino Uno offers a costeffective and secure solution, eliminating the drawbacks of manual switching and simplifying cost reduction and maintenance. Additionally,applying a ZnO coating to the street light casings provides effective protection against dust and moisture, resulting in efficient lighting. The process involves sol-gel deposition of ZnO nanoparticles on silica glass substrates, followed by preannealing and repeated dip coating. Annealing at temperatures between 450°C and 600°C further improves the results. The uniformand defect-free coatings are confirmed by SEM images, while transmission spectra reveal over80% penetration of visible light (400 nm to 900 nm). Lower precursor concentrations lead to better penetration of light below 300 nm wavelength.

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A Critical Review on Heat Treatment of Aluminium Alloys

Cited by 48 publications

References 30 publications

Homogeneous Age-hardening of Large-sized Al-Sc Foams via Micro-alloying with Zr and Ti

Homogeneous Age-hardening of Large-sized Al-Sc Foams via Micro-alloying with Zr and Ti

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Modern Smart Street Light Monitoring Systems

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