Removal of Iron From Aluminum: A Review

Zhang, Lifeng; Gao, Jianwei; Damoah, Lucas Nana Wiredu; Robertson, David G.

doi:10.1080/08827508.2010.542211

Cited by 190 publications

(101 citation statements)

References 91 publications

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“…Comparably, the α-AlFeSi phase has compact morphologies such as Chinese script, starlike or polygon, which are less harmful to the mechanical property of alloy. [1][2][3][4][5][6][7][8][9][10][11][12] Thus, much effort has been made to reduce the fraction of β-AlFeSi or to transfer β-AlFeSi to α-AlFeSi.…”

Section: Introductionmentioning

confidence: 99%

Study of Refinement and Morphology Change of AlFeSi Phase in A380 Alloy due to Addition of Ca, Sr/ Ca, Mn and Mn, Sr

Wang

Xu²,

Han

2016

Mater. Trans.

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While aluminum-silicon (Al-Si) alloys are one of the most versatile aluminum alloys, iron is considered one of the most harmful elements in Al-Si diecasting application. Its presence leads to the precipitation of many AlFeSi intermetallic phases and unacceptable mechanical properties, such as reduction in ductility. Thus controlling the fraction and morphology of the AlFeSi phase, especially the β-AlFeSi phase is an important way to improve the ductility of Al-Si die casting alloys. In this article, Ca/Mn, Ca/Sr and Sr/Mn elements were added into A380 alloys to study the effect of combined element addition on the morphology change of the AlFeSi phase. Sr and Ca addition can impair the modication effect and introduce sludge. Mn and Ca, Mn and Sr can result in a microstructure consisting of fcc α-Al, modi ed eutectic Si, α-AlFeSi Chinese script phases and a re ned platelet β-phase. However, use of high cooling rates can better re ne the morphology of the AlFeSi phase and lead to a better alloy product.

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Section: Introductionmentioning

confidence: 99%

Study of Refinement and Morphology Change of AlFeSi Phase in A380 Alloy due to Addition of Ca, Sr/ Ca, Mn and Mn, Sr

Wang

Xu²,

Han

2016

Mater. Trans.

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“…In Al-Si alloys, Fe-rich intermetallics are virtually always present to some degree: Fe, which has very limited solid solubility [19,20] in aluminium alloys, is one of the main alloy impurities (it is sometimes also used as a deliberate alloying element in hypereutectic Al-Si alloys [24]). The most common and important known Fe-intermetallic is the b-Al 5 FeSi phase.…”

Section: Discussionmentioning

confidence: 99%

Silicon particle pinhole defects in aluminium–silicon alloys

2016

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It was recently shown that silicon particles in heat-treated Al-Si casting alloys can contain flaws such as surface pinholes and grooves, which cause varying degrees of reduction in the in situ particle fracture strength and hence influence the mechanical properties of this class of alloys. In this work, we show that the formation of one class of such strength-limiting flaws in solidified and coarsened Si particles, namely surface pinholes, is caused by alloy impurities such as Fe and Ti in both binary eutectic Al-Si alloys and also in casting alloy A356. This is evidenced by using Focused Ion Beam serial sectioning tomography coupled with Energy-Dispersive X-Ray Spectroscopy, and confirmed by the observation that a high-purity Al-Si alloy presents a significantly lower proportion of pinholes along the surface of the silicon phase than does an alloy of commercial purity. A similar correlation between alloy purity and the formation of another, more severe strength-limiting particle defect, namely grooved interfaces, was on the other hand not found.

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“…A similar observation can be made from the thermal analysis results of the C3BS alloy. It is estimated that the formation temperature of this reaction is approximately 611 ∘ C which is close to the formation temperature of -AL; this would facilitate the precipitation of the Be-Fe phase in the interdendritic region, within the -AL, or both, especially in high Becontaining alloys of the order of 0.2 wt.% [14,[20][21][22][23]. Also, this temperature is higher than the formation temperature of the preeutectic -Al 5 FeSi phase marked as peak (2) in Table 3 for the Be-free A1 alloy and for the Sr-modified Be-containing C3BS alloy, as shown in Figures 2 and 4.…”

Section: Effects Of Beryllium Contentmentioning

confidence: 99%

Microstructural Characterization of Beryllium Treated Al-Si Alloys

Ibrahim

Alkahtani

Abuhasel

et al. 2015

Advances in Materials Science and Engineering

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The present study was carried out on B356 and B357 alloys using the thermal analysis technique. Metallographic samples prepared from these castings were examined using optical microscopy and FESEM. Results revealed that beryllium causes partial modification of the eutectic Si, similar to that reported for magnesium additions. Addition of 0.8 wt.% Mg reduces the eutectic temperature by ∼10 ∘ C. During solidification of alloys containing high levels of Fe and Mg, but no Sr, formation of a Be-Fe phase was detected at 611 ∘ C, close to that of -Al. The Be-Fe phase precipitates in script-like form at or close to the -Al 5 SiFe platelets. A new reaction, composed of fine particles of Si and -Fe phase, was observed to occur near the end of solidification in high Mg-, high Fe-, and Be-containing alloys. The amount of this reaction decreased with the addition of Sr. Occasionally, Be-containing phase particles were observed as part of the reaction. Addition of Be has a noticeable effect on decreasing the -Al 5 FeSi platelet length; this effect may be enhanced by addition of Sr. Beryllium addition also results in precipitation of the -Al 5 FeSi phase in nodular form, which lowers its harmful effects on the alloy mechanical properties.

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Removal of Iron From Aluminum: A Review

Cited by 190 publications

References 91 publications

Study of Refinement and Morphology Change of AlFeSi Phase in A380 Alloy due to Addition of Ca, Sr/ Ca, Mn and Mn, Sr

Study of Refinement and Morphology Change of AlFeSi Phase in A380 Alloy due to Addition of Ca, Sr/ Ca, Mn and Mn, Sr

Silicon particle pinhole defects in aluminium–silicon alloys

Microstructural Characterization of Beryllium Treated Al-Si Alloys

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