Utilizing a novel modifier to realize multi-refinement and optimized heat treatment of A356 alloy

Wu, Dayong; Kang, Jie; Feng, Zhihao; Su, Ru-Keng; Liu, Chunhai; Li, Tian; Wang, Lisheng

doi:10.1016/j.jallcom.2019.03.327

Cited by 27 publications

(14 citation statements)

References 38 publications

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“…The average diameter was found to be 40.3 nm while the aspect ratio hits the least with 68.9% and 82.1% lesser than that void yttrium. Wu et al [21] made Al-5Sr-8Ce alloy as a special innovative enhancer for A356. The influence of it on the microstructure and tensile qualities of A356 was experimentally researched with optimisation of enhancement period by modification efficiency.…”

Section: Literature Review 21 Extant Literature Review Concerning A3mentioning

confidence: 99%

“…A number of current research papers discuss the probable advantages of e-ISSN: 2289-7771 387 reinforcing A356 with organic materials (e.g. [10][11][12][13]), whereas other investigators have exhibited crucial concern about specific property enhancement for the A356 reinforced composites, including corrosion resistance [14], surface enhancement [15], microstructural and associated property enhancement through heat treatment [16][17][18][19][20][21]. The reported studies are nonetheless principal papers regarding metallic reinforced A356 alloy while very scanty papers were noted for organic reinforced A356 alloy, indicating a very restricted number of experimental research available in the literature on A356 alloy organic reinforced composites.…”

Section: Introductionmentioning

confidence: 99%

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Taguchi Optimisation of Cast Geometries for A356/Organic Particulate Aluminium Alloy Composites Using a Two-Phase Casting Process

Nwafor

Oke

Ayanladun

2019

JASPE

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The A356 alloy is widely known to exhibit an extremely superior casting, machining, mechanical, and corrosion resistance properties. Despite these, it constitutes an environmental nuisance at its improper disposal for worn-out engine blocks. Also, organic reinforcements have the potentials to reduce the environmental impacts of composites. Consequently, there exits significant research potential to fuse A356 alloy with organic materials to obtain enhanced composite properties. In the area of aluminium matrix, as melting and solidifications of materials are done the accuracy of measurements is driven by the huge array of process parameters and the geometrical aspect of cast components is important. For these reasons, we attempt to solve the problem of optimising the geometry of casts in a complicated scenario with the use of the robust Taguchi's methods. To optimise the framework, the significant process parameters are identified and their effects studied in a route using Taguchi, Taguchi-Pareto and Taguchi–ABC methods. Parameters such as the volume of the cast, length, weight, density, height, width, breadth, weight loss and the total weight of organic materials infused into the melting process were studied for parametric changes, interactions and optimisation with L27 orthogonal array. The analysis of variance for the A356 alloy cast revealed that the density parameter of cast 1 had the highest and major significant effect on the casting process with a variance of 333573, followed by weight parameter of casts 1 and 2, total weight of organic material parameters and weight loss with the variance values of 0.007, 0.005, 0.001 and 0.004, respectively. The variance of other parameters was insignificant to the A356 alloy cast.

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Section: Literature Review 21 Extant Literature Review Concerning A3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Taguchi Optimisation of Cast Geometries for A356/Organic Particulate Aluminium Alloy Composites Using a Two-Phase Casting Process

Nwafor

Oke

Ayanladun

2019

JASPE

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“…The A356 alloy is widely used in lightweight automotive materials, electronic communications and other applications, owing to its excellent casting properties, corrosion resistance and high toughness [ 1 , 2 , 3 ]. Limited by the molding processes of Al alloy castings, such as low-pressure casting, gravity casting and counterpressure casting [ 4 , 5 ], the melt solidifies at a lower cooling rate, which results in a coarser organization of the alloy.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, Sr is an excellent modifier due to its long-term modification effect, which is applied in many fields. However, Sr has almost no effect on the refinement of the matrix structure (α-Al) [ 1 , 16 ], which precludes further improvements in the toughness of the Al castings.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic-Assisted Modification Treatment on the Microstructure and Properties of A356 Alloy

Song

Wang

et al. 2022

Materials

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Ultrasonic treatment was applied to an A356 aluminum melt with different modifiers, and the effects of ultrasonic treatment on the structure and properties of the A356 alloy were studied. The results showed that α-Al was effectively refined with different ultrasonic modification treatments. In particular, ultrasonic treatment showed the most obvious refinement with macroscopic grains of unmodified alloy and optimized the refinement of secondary dendrite arm spacings in the Sr/Ce synergistic alloys. The eutectic Si of the unmodified A356 alloy had no obvious change after the ultrasonic treatment, but the branch diameter of the eutectic Si reduced in the Sr and Sr/Ce modification alloys after the ultrasonic treatment. The ultrasonic treatment significantly improved the ultimate tensile strength and elongation of the as-cast A356 alloy with the unmodified material, which was due to refinement of the α-Al grains by the ultrasonic treatment. After the T6 heat treatment, the ultimate tensile strength values of the alloys showed no obvious change due to the ultrasonic treatment, but the plasticity of the alloy was significantly improved. Mg2Si precipitation was the dominant strengthening mechanism during the T6 heat treatment, while the plasticity was determined by the size and distribution of the eutectic Si. Acoustic cavitation caused by the ultrasound-activated impurities and the induced heterogeneous nucleation and supercooled nucleation in the groove melt was the main cause of the α-Al refinement, the eutectic Si modification and the improvement in the mechanical properties.

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“…In recent years, researchers have paid particular attention to the issues of the modification of Al-Si alloys using the complex impact on their structure [7][8][9][10][11][12][13]. The use of modifiers that give an impact on various structural components of the alloys is more effective than modification of a single phase.…”

Section: Introductionmentioning

confidence: 99%

Complex Structure Modification and Improvement of Properties of Aluminium Casting Alloys with Various Silicon Content

Shlyaptseva

Petrov

Ryakhovsky

et al. 2021

Metals

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The possibility of using complex structure modification for aluminium casting alloys’ mechanical properties improvement was studied. The fluxes widely used in the industry are mainly intended for the modification of a single structural component of Al–Si alloys, which does not allow unifying of the modification process in a production environment. Thus, a new modifying flux that has a complex effect on the structure of Al–Si alloys has been developed. It consists of the following components: TiO2, containing a primary α-Al grain size modifier; BaF2 containing a eutectic silicon modifier; KF used to transform titanium and barium into the melt. The effect of the complex titanium dioxide-based modifier on the macro-, microstructure and the mechanical properties of industrial aluminium–silicon casting alloys containing 5%, 6%, 9%, 11% and 17% Si by weight was studied. It was found that the tensile strength (σB) of Al–Si alloys exceeds the similar characteristics for the alloys modified using the standard sodium-containing flux to 32%, and the relative elongation (δ) increases to 54%. The alloys’ mechanical properties improvement was shown to be the result of the flux component’s complex effect on the macro- and microstructure. The effect includes the simultaneous reduction in secondary dendritic arm spacing due to titanium, the refinement and decreasing size of silicon particles in the eutectic with barium and potassium, and the modifying of the primary silicon. The reliability of the studies was confirmed using up-to-date test systems, a significant amount of experimental data and the repeatability of the results for a large number of samples in the identical initial state.

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Utilizing a novel modifier to realize multi-refinement and optimized heat treatment of A356 alloy

Cited by 27 publications

References 38 publications

Taguchi Optimisation of Cast Geometries for A356/Organic Particulate Aluminium Alloy Composites Using a Two-Phase Casting Process

Taguchi Optimisation of Cast Geometries for A356/Organic Particulate Aluminium Alloy Composites Using a Two-Phase Casting Process

Effect of Ultrasonic-Assisted Modification Treatment on the Microstructure and Properties of A356 Alloy

Complex Structure Modification and Improvement of Properties of Aluminium Casting Alloys with Various Silicon Content

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