Effects of Sr-modification, iron-based intermetallics and aging treatment on the impact toughness of 356 Al–Si–Mg alloy

Elsebaie, Ossama; Samuel, A. M.; Samuel, F. H.

doi:10.1007/s10853-010-5181-1

Cited by 58 publications

(23 citation statements)

References 16 publications

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“…That would increase the nucleation rate n and grain growth rate v g of primary a-A1 in the same material respectively, as shown in Eqs. (7) and (8). However, the increment in nucleation rate n was greater than that in v g .…”

Section: Resultsmentioning

confidence: 80%

“…Modification of Si phases in Al-Si alloys is carried out extensively in industry to improve mechanical properties. Traditionally, P, Na, Sr, and B are added as modifiers to Al-Si alloys, [7][8][9] and the eutectic microstructure is converted from a coarse flake to a fine fibrous morphology and large cuboid-shaped primary silicon particles were refined simultaneously. Nogita et al 10 investigated the eutectic silicon modification efficiency of fourteen kinds of rare earth elements in Al-10Si alloy.…”

Section: Introductionmentioning

confidence: 99%

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Modification of near-eutectic Al–Si alloys with rare earth element samarium

Hongxu

Yan

2014

J. Mater. Res.

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The modification of near-eutectic Al-Si alloy with samarium additions (0-0.9 wt.% content) has been studied. The thermal analysis results indicated that the addition of Sm in Al-12Si alloy caused a depression of eutectic temperature (ΔT E ). And it was found that Sm was capable of breaking down the primary a-A1 phases, giving rise to an increment in the number of dendrites. Simultaneous primary Si refinement and eutectic modification were achieved by Sm addition. When 0.6 wt.% Sm was added to the alloy, the silicon in Al-12Si alloy was best refined and showed a fully modified, fine fibrous eutectic structure; the primary a-Al phase appears as a slightly dual dendritic-cellular nature and a pine-tree structure. Moreover, the mechanical properties were investigated by the tensile test. A good combination of ultimate tensile strength (217 MPa) and elongation (1.3%) was obtained when the addition of Sm was up to 0.6 wt.%.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Modification of near-eutectic Al–Si alloys with rare earth element samarium

Hongxu

Yan

2014

J. Mater. Res.

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“…Eutectic Si in untreated cast Al-Si alloys is often very coarse, leading to poor mechanical properties, particularly ductility [9,10]. To overcome this drawback, modification melt treatment is usually applied to cast Al-Si alloys through the addition of certain elements such as strontium, antimony and sodium in order to modify the Si morphology.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sr content on the microstructure and mechanical properties of cast Al–12Si–4Cu–2Ni–0.8Mg alloys

Sui

Wang

et al. 2015

Journal of Alloys and Compounds

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“…Therefore, various modification elements were used to change the acicular eutectic Si into a fibrous structure [7][8][9][10][11] . Na and Sr are usually applied and show good modification effect [7] .…”

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confidence: 99%

Tensile ductility improvement of AlSi9Cu1 alloy by chemical composition optimization

et al. 2017

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Diesel engines are used more and more widely in North America and Europe for passenger cars and light trucks because of their high fuel efficiency and reduced greenhouse gas emissions. These diesel engine components require a higher tensile property due to higher compression ratio and maximum breakout pressure of diesel engine compared with gasoline engines. Despite many advantages in the development of aluminum alloys, the alloys currently used for gasoline engine parts, typically A356 and 319 alloys, cannot meet the demand for high heat resistance [1][2][3][4][5] . In our previous work [6] , we studied the influence of the secondary dendrite arm spacing (SDAS) as well as the combination of the SDAS and the heat treatment parameters on the mechanical properties of a cylinder head of A356 alloy. We found that the A356 alloy cylinder head with smaller SDAS reached its peak value Abstract: Diesel engines, characterized by higher breakout pressure and compression ratio in comparison with gasoline engines, require particularly elevated tensile properties for their engine parts. In order to maintain both high strength and high ductility in the cylinder head, i.e., to obtain higher percent elongation without further reducing the tensile strength, AlSi9Cu1 alloy was used to prepare the cylinder head in an aluminum diesel engine. At the same time, the effect of different modification elements, Na or Sr, and Fe content on the reduction of secondary dendrite arm spacing (SDAS) was discussed, and the design of T7 heat treatment parameters were analyzed in order to improve the tensile ductility. The result shows: (1) The SDAS is as small as 18±3 µm for the Sr modified alloy. (2) The percent elongation of the alloy with Sr modification increases by 66.7% and 42.9%, respectively, compared with the unmodified alloy and the alloy with Na modification. (3) Lower Fe content alloy (0.10%) gives good results in percent elongation compared to the alloy with higher Fe content (0.27%); in particular, after Sr modification and T7 heat treatment, the elongation of over 5% is obtained. of hardness (HB), ultimate tensile strength (UTS) and yield strength (YS) at a lower aging temperature, but the over-aged structure was also yielded earlier. One of the most important factors that limit the use of A356 alloy for diesel cylinder head is its lower tensile properties at elevated temperatures: the properties of A356 (without Cu) alloy deteriorate seriously when temperature reaches 250 °C [1][2][3][4][5] . The diesel cylinder head being developed requires an optimum combination of strength and elongation: UTS ≥ 290 MPa, YS ≥ 240 MPa, percent elongation ≥4.5% and HB from 95 to 125, and for gravity casting, a value of SDAS not higher than 25 micron in the combustion chamber. To meet these requirements, we selected a candidate alloy containing copper -AlSi9Cu1 to produce the diesel cylinder head. The chemical compositions of the commercial AlSi9Cu1 are very similar to alloy 354 of the AFS (the American Foundrymen's Society). It is an alloy used by...

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Effects of Sr-modification, iron-based intermetallics and aging treatment on the impact toughness of 356 Al–Si–Mg alloy

Cited by 58 publications

References 16 publications

Modification of near-eutectic Al–Si alloys with rare earth element samarium

Modification of near-eutectic Al–Si alloys with rare earth element samarium

Effects of Sr content on the microstructure and mechanical properties of cast Al–12Si–4Cu–2Ni–0.8Mg alloys

Tensile ductility improvement of AlSi9Cu1 alloy by chemical composition optimization

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