Microstructure and Mechanical Properties of Ductile Aluminium Alloy Manufactured by Recycled Materials

Yang, Hailin; Ji, Shouxun; Watson, Douglas; White, Mark; Fan, Z.

doi:10.4028/www.scientific.net/msf.794-796.1077

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…Therefore, increasing the acquisition resolution with smaller voxel size clearly improves the detection of microstructure and porosities in the high pressure die castings. Moreover, for the results obtained at 2.1 μm/vox, the levels of intermetallic phase were much higher than the experimental results obtained in previous publication [11][12][13]. However, it was close to the experimental results after segmentation analysis.…”

Section: Resultssupporting

confidence: 80%

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X-Ray Computed Tomographic Investigation of High Pressure Die Castings

Watson

Fan

2017

Light Metals 2017

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The porosities and intermetallic phases in a high pressure die cast Al-Mg-Si-Mn alloy was investigated using 3D X-ray computed tomography with different scanning resolutions. The experimental results demonstrated the porosity level and phase detection of dependency upon voxel sizes. The porosity levels were 0.4%, 0.5% and 0.8% and the intermetallic phases were 0.3%, 0.4% and 0.6% when the same casting sample was scanned at 15μm/vox, 7.2 μm/vox and 2.1 μm/vox, respectively. However, the structural parameters should be assessed to determine the necessary and/or possible image quality, weighing factors such as scan time, field of view, and voxel sizes.

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Section: Resultssupporting

confidence: 80%

“…However, the other phases observed by other techniques in ref. [11,12,13] could not be seen in the scanned images. In particular, the eutectic Si and the secondary intermetallics were not observed in the scanned images even with the small voxel size.…”

Section: Resultsmentioning

confidence: 91%

X-Ray Computed Tomographic Investigation of High Pressure Die Castings

Watson

Fan

2017

Light Metals 2017

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“…2. As previously described in terms of the characteristics and the formation of the microstructure of the die-cast Al-Mg-Si-Mn alloy [23], the two-stage solidification was responsible for the microstructural formation in high pressure die casting. The α-Al phase formed in the shot sleeve has dendritic or fragmented dendritic morphology, whilst the α-Al phase formed in the die cavity exhibited fine globular morphology.…”

Section: As-cast Microstructure Of the Die-cast Al-mg-si-mn Alloymentioning

confidence: 60%

“…It has been found that the improved ductility can only be achieved with tight control of impurities levels. Iron has been identified as a detrimental element for the mechanical properties and needs to be minimised during application of the recycled alloys [22,23]. However, it is still unclear for the effect of other common elements including Ni.…”

Section: Introductionmentioning

confidence: 99%

Effect of nickel on the microstructure and mechanical property of die-cast Al–Mg–Si–Mn alloy

et al. 2014

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The effect of nickel on the microstructure and mechanical properties of a die-cast Al-Mg-Si-Mn alloy has been investigated. The results show that the presence of Ni in the alloy promotes the formation of Ni-rich intermetallics. These occur consistently during solidification in the die-cast Al-Mg-Si-Mn alloy across different levels of Ni content. The Ni-rich intermetallics exhibit dendritic morphology during the primary solidification and lamellar morphology during the eutectic solidification stage. Ni was found to be always associated with iron, forming AlFeMnSiNi intermetallics and no Al 3 Ni intermetallic was observed when Ni concentrations were up to 2.06wt% in the alloy. Although with different morphologies, the Ni-rich intermetallics were identified as the same AlFeMnSiNi phase bearing a typical composition of Al (Fe,Mn) [2][3][4][5][6][7] SiNi [4][5][6][7][8][9]. With increasing Ni content, the spacing of the -Al-Mg 2 Si eutectic phase was enlarged in the Al-Mg-Si-Mn alloy. The addition of Ni to the alloy resulted in a slight increase in the yield strength, but a significant decrease in the elongation. The ultimate tensile strength (UTS) increased slightly from 300 MPa to 320MPa when a small amount (e.g., 0.16wt. %) of Ni was added to the alloy, but further increase of the Ni content resulted in a decrease of the UTS. Keywords: Aluminium alloy; microstructural evolution; mechanical properties; Ni-rich compounds; high pressure die casting; CALPHAD modelling IntroductionIn the manufacture of fuel efficient transport systems, weight reduction through the use of lightweight materials remains a very successful and simple means of improving fuel economy and reducing harmful emissions. Increases in aluminium alloys usage for automotive applications provide significant opportunities for weight reduction and therefore real scope to achieve environmental goals, when compared to a conventional steel-based vehicle [1,2]. A 100kg reduction in car weight leads to a saving of 10g CO 2 per kilometre [3]. Aluminium's weight to strength ratio and its high recyclability potential has resulted in a number of aluminium intensive vehicles being released by major automotive manufacturers. This light-weighting strategy has resulted in a decrease of CO 2 produced during the vehicle use phase and also in the manufacturing stage by reducing the use primary aluminium through utilising end-of-life vehicles (ELVs) metal scrap recycling [4,5]. Up to 75% of aluminium recycled in Europe has been used for applications in transportation [6]. The re-use of recycled metal scraps is an important factor for the closed-loop material cycles to support circular economies in accordance with ecological principles [ 7 , 8 ]. Consequently, it is important and essential to understand more about the recycling of aluminium alloys. In recycling aluminium alloys, the unchecked accumulation of impurities will result in the solute concentrations of these elements exceeding the limitation of the registered specification, this restricts the applicati...

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“…The application of lightweight materials in car body structure is one of the most recent developments in automotive industry, in which the ductile alloys play a critical role in manufacturing of thin wall components made by high pressure die casting (HPDC). It is more interesting to make the castings with recycled aluminium alloys due to the benefits in economics and environment, in particular the reduction of energy consumption and the conservation of natural resources [1][2][3]. However, the accumulation of impurity elements in the recycled aluminium alloys is one of the major concerns as it is unavoidable in practice.…”

Section: Introductionmentioning

confidence: 99%

Melt superheating on the microstructure and mechanical properties of diecast Al-Mg-Si-Mn alloy

Yang

2015

Met. Mater. Int.

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The application of aluminium alloys in automotive body structure is one of the main developments in recent years. The increase of the mechanical properties of the ductile die-casting is one of the most critical topics for the application. In this work, the effect of melt superheating on the morphology, size and distribution of α-Al phase and Fe-rich intermetallics, and on the mechanical properties of the Al-Mg-Si-Mn diecast alloy was investigated. The results showed that the refined microstructure could be obtained through melt superheating. The volume fraction of dendritic α-Al phase and the Fe-rich intermetallic phase formed in the shot sleeve was significantly reduced, resulting in the refined microstructure. Overall, the melt superheating could improve the mechanical properties of the yield strength, ultimate tensile strength, and elongation of the diecast Al-Mg-Si-Mn alloy. And, the Fe-rich intermetallic phase formed in the shot sleeve with the coarse compact morphology and formed in the die cavity with the fine compact particles were identified as the same α-Al12(Fe,Mn)3Si composition in the present experimental conditions, which was not affected by the melt superheating.

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Microstructure and Mechanical Properties of Ductile Aluminium Alloy Manufactured by Recycled Materials

Cited by 3 publications

References 6 publications

X-Ray Computed Tomographic Investigation of High Pressure Die Castings

X-Ray Computed Tomographic Investigation of High Pressure Die Castings

Effect of nickel on the microstructure and mechanical property of die-cast Al–Mg–Si–Mn alloy

Melt superheating on the microstructure and mechanical properties of diecast Al-Mg-Si-Mn alloy

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