Heat treatment as a route to tailor the yield-damping properties in A356 alloys

Carneiro, V.H.; Puga, Hélder; Meireles, José

doi:10.1016/j.msea.2018.05.042

Cited by 27 publications

(16 citation statements)

References 58 publications

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“…The isothermal state was kept for another 5 min to allow for a full dissolving of the master alloys, after which ultrasound degassed the melt [23] to release entrapped hydrogen. This also prevents the sedimentation of the refining particles [24,25]. Posteriorly, the melt was allowed to cool down (700 • C) and poured into pre-heated (250 ± 2 • C) cylindrical (Ø30 ± 0.5 × 70 mm) steel molds.…”

Section: Sample Casting and Testingmentioning

confidence: 99%

Ultrasonic Assisted Turning of Al alloys: Influence of Material Processing to Improve Surface Roughness

2019

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Ultrasonic machining has been used over a decade to enhance the surface finishing and overall processing characteristics of conventional technologies. The benefits that are usually associated to this approach generate an increasing interest in both academic and industrial fields, especially in the turning operation due to its simple application. In this study, ultrasonic assisted turning is used to study the effect of intermittent tool contact on the surface quality of cast and wrought aluminium alloys. The resulting surface roughness and topography plots were evaluated through a three-dimensional (3D) optical profilometer. Additionally, stereo microscopy and detailed by scanning electron microscopy analyzed chip shape and morphology. The experimental results show that the appropriate use of an ultrasonic intermittent tool can improve the superficial quality up to 82% and reduce the maximum peak height by 59 % for a 0.045 mm/rev feed rate. When the feed rate is increased to 0.18 mm/rev, the surface roughness may be enhanced by 60% and the maximum peak height reduced by 76%. Furthermore, due to the introduction of a distinct cutting mechanism, the traditional chip shape is modified when the ultrasonic tool excitation is applied. A model is suggested to explain the chip growth and the fracture behaviour.

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Section: Sample Casting and Testingmentioning

confidence: 99%

Ultrasonic Assisted Turning of Al alloys: Influence of Material Processing to Improve Surface Roughness

2019

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“…The outcome revealed that the Al-3B-5Sr alloy chiefly contains phases of α-Al and coarse SrB6, whereas the Al-3B-5Sr-7Si alloy comprised asymmetrical blocky Al4Sr phase, AlB2 and Si apart from the above-declared phases. Ma and Carneiro et al [18] explored the effect of thermal enhancement in the microstructure of A356 in ceramic block relating the morphology changes with the mechanisms within the alloy that favours the yield strength and brings down dumping. Elahi and Shabestari [17] investigated the microstructure and impact response of A356 aluminium alloy at post melt enhanced and T6 thermal enhancement state.…”

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%

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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“…The excellent castability and ductility, combined with a reduced tendency to defect formation, have been crucial factors in increasing the application of AlSi7Mg based alloys in the production of structural castings cast by sand molding [24,25]. The mechanical properties of such castings can be improved by solubilizing and aging treatments, providing uniform distribution of Mg and Si precipitates in the aluminum matrix [26,27].…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

The Role of Acoustic Pressure during Solidification of AlSi7Mg Alloy in Sand Mold Casting

Puga¹,

Barbosa²,

Carneiro³

2019

Metals

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New alloy processes have been developed and casting techniques are continuously evolving. Such constant development implies a consequent development and optimization of melt processing and treatment. The present work proposes a method for studying the influence of acoustic pressure in the overall refinement of sand cast aluminum alloys, using and correlating experimental and numerical approaches. It is shown that the refinement/modification of the α-Al matrix is a consequence of the acoustic activation caused in the liquid metal directly below the face of the acoustic radiator. Near the feeder, there is a clear homogeneity in the morphology of the α-Al with respect to grain size and grain circularity. However, the damping of acoustic pressure as the melt is moved away from the feeder increases and the influence of ultrasound is reduced, even though the higher cooling rate seems to compensate for this effect.

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Heat treatment as a route to tailor the yield-damping properties in A356 alloys

Cited by 27 publications

References 58 publications

Ultrasonic Assisted Turning of Al alloys: Influence of Material Processing to Improve Surface Roughness

Ultrasonic Assisted Turning of Al alloys: Influence of Material Processing to Improve Surface Roughness

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

The Role of Acoustic Pressure during Solidification of AlSi7Mg Alloy in Sand Mold Casting

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