Effect of magnesium on the distribution of tin and lead in Al?Si alloys

Grebenkin, V. S.; Sil'chenko, T. V.; Gorshkov, A. A.; Dzykovich, I. Ya.

doi:10.1007/bf00690773

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…In all cases, the path of Al + Mg 2 B divides the corner into two regions: Al + Mg 2 B + Mg 5 Al 8 (or Mg 2 Al 3 ), where B represents Si or Sn. An examination of the regions of interest of the Al-Si-Mg and Al-Sn-Mg diagrams leads to the conclusion that in the Al-Si-Mg system, compounds of Sn with Mg (Mg 2 Sn) form as a result of excess Mg from the unstable compound Mg 5 Al 8 and the Mg in the stable compound Mg 2 Si through the reactions [36] Al þ Mg 2 Si þ Mg 5 Al 8 þ Sn ! Al þ Mg 2 Si þ Mg 2 Sn ½1…”

Section: Resultsmentioning

confidence: 99%

“…In Al-Si-Cu-Mg alloys, Sn prevented the formation of Mg 2 Si, and Sn and lead prevented the formation of the Al x Mg 5 Cu 4 Si 4 phase. Grebenkin et al [36] determined that Sn is analogous to Si in electron distribution and can thus substitute for it in the Mg compounds Mg 2 Si and Al x Mg 5 Cu 4 Si 4 . No free Sn was found in AlSi-Mg alloys when Sn and Mg levels were similar.…”

Section: Introductionmentioning

confidence: 98%

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Influence of Tin Addition on the Microstructure and Mechanical Properties of Al-Si-Cu-Mg and Al-Si-Mg Casting Alloys

Mohamed

Samuel

et al. 2008

Metall Mater Trans A

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This article presents the results of an experimental study of the effects of tin (Sn) additions (less than 0.15 wt pct) on the microstructure and mechanical properties of B319.2 and A356.2 cast aluminum (Al) alloys. The microstructural evolution was examined by means of optical microscopy and electron probe microanalysis (EPMA) techniques. Porosity measurements were also made using image analysis. Alloy hardness, tensile and impact properties were evaluated at room temperature for both as-cast and heat-treated conditions. Experimental results show that in B319.2 alloy, Sn precipitates in the form of Sn particles (b-Sn) within the Al 2 Cu network, and as minuscule (300 to 500 nm) Mg 2 Sn particles on the eutectic Si particles. However, in A356.2 alloy, Sn precipitates mainly as Mg 2 Sn in the form of Chinese script. Both the ductility and the toughness of as-cast B319.2 and A356.2 alloys are sensitive to variations in Sn content, while the yield strength (YS) remains practically unaffected. The higher ductility and toughness of Sn-containing alloys in the as-cast condition may be attributed mainly to the stress-strain state in the matrix material associated with the fineness of Sn-bearing phases.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Influence of Tin Addition on the Microstructure and Mechanical Properties of Al-Si-Cu-Mg and Al-Si-Mg Casting Alloys

Mohamed

Samuel

et al. 2008

Metall Mater Trans A

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“…Grebenkin et al 85 found that Sn and Pb are the electronic analogs of silicon and replace it in magnesium compounds thereby preventing the formation of the Mg2Si and Al x Mg5Si4Cu4 hardening phases in Al-Cu-Si-Mg alloys.…”

Section: Effects Of Tinmentioning

confidence: 99%

Effect of additives on the mechanical properties and machinability of a new aluminum-copper base alloy /

Elgallad¹

2010

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The present dissertation is aimed at investigating the effects of additives on the mechanical properties and machinability of the 220 alloy which is a new Al-2%Cu-1.3%Si-0.4%Mg casting alloy intended for automotive applications. The research involved here was accomplished through two types of study: (i) study of mechanical properties; (ii) and study of machinability. The study of mechanical properties was proposed to examine the effects of Sr, Ti, Zr, Fe, Mn, and Ag as well as of free-cutting elements, specifically Sn and Bi, on the mechanical properties of the 220 alloy in both the as-cast and heat-treated conditions. The mechanical properties in question include tensile, hardness, and impact properties which were all evaluated at room temperature. The study of machinability was devoted to examining the drilling and tapping performance of four 220 based-alloys as well as of A206 alloy which was selected for a comparative study on the machinability of this particular alloy and that of 220 alloy. The four 220 based-alloys were selected from amongst the alloys prepared in the first study and include: (i) 220 alloy; (ii) 220 alloy + Ti + Zr; (iii) 220 alloy + Ti + Zr + Sn; and (iv) 220 alloy + Ti + Zr + Bi. The machining performance was evaluated based on the calculation of the cutting force, cutting moment, and tool life, as well as on the investigation of chip characteristics. Tool life was expressed as the number of holes drilled/tapped up to the point of tool breakage.An assessment of the microstructure reveals that A^Cu, AlsMggSiôC^, and the Chinese script-like a-Ali5(Fe,Mn)3Si2 phases are the main microstructural constituents of the 220 alloy. The absence of free Si in the microstructure implies that the Si-content was consumed in the formation of the Al-Fe-Si and Al-Cu-Mg-Si intermetallic phases. The platelet-like /?-AlsFeSi phase was not in evidence because of the higher Mn:Fe ratio (~1) of the 220 alloy which promotes the formation of the a-Fe phase at the expense of the /?-Fe phase. The addition of Sr refines the morphology of the ct-Fe Chinese script phase to a certain extent, resulting in the even distribution of the particles of this phase within the aluminum matrix. The combined addition of Ti and Zr causes a reduction in the grain size by about 68% compared to the non-grain-refined base 220 alloy. This reduction may be ascribed to the formation of Zr-Ti particles which act as nucleation sites for small equiaxed grains of cc-Al. Tin precipitates in the form of /?-Sn particles which appear as small non-uniformly distributed clusters usually solidified within the AbCu phase network. Bismuth and /?-Sn particles were found undissolved in the Almatrix after heat treatment, thereby making it possible to induce their free-cutting action during machining.Results from the evaluation of the mechanical properties show that, because of the low Si content, the effects of Sr on the mechanical properties with respect to the modification of silicon eutectic do not come into play. The role of Sr in refining th...

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“…In Al-Si-Cu-Mg alloys, Sn prevented the formation of Mg 2 Si, while Sn and Pb prevented the formation of the Al x Mg 5 Cu 4 Si 4 phase. Grebenkin et al [22] also determined that tin is analogous to silicon electronically and replaces silicon in the magnesium compounds Mg 2 Si and Al x Mg 5 Cu 4 Si 4 .…”

Section: Introductionmentioning

confidence: 96%

Effects of Individual and Combined Additions of Pb, Bi, and Sn on the Microstructure and Mechanical Properties of Al-10.8Si-2.25Cu-0.3Mg Alloy

Mohamed

Samuel

et al. 2008

Metall Mater Trans A

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The effects of individual and combined additions of Pb, Bi, and Sn on the microstructure and mechanical properties of the modified grain-refined Al-10.8 pct Si alloy were investigated. Microstructures were monitored using optical microscopy and electron probe microanalysis (EPMA) techniques. Mechanical properties of as-cast and heat-treated alloys were evaluated using hardness measurements and tensile testing. The results show that Pb alone has no significant effect on the microstructure and mechanical properties in the as-cast and heat-treated conditions; Bi counteracts the modifying effect of Sr, leading to coarsening of the eutectic Si particles; however, Sn precipitates as b-Sn within the Al 2 Cu network when added individually. Lead and bismuth combined precipitate as bismuth particles enveloped with Pb 3 Bi phase, thereby improving mechanical properties in the as-cast and aged conditions contrary to the combined addition of Bi and Sn. Tin and indium combined precipitate as In 3 Sn phase, thereby providing better mechanical properties in as-cast and aged conditions than may be obtained through the addition of Sn alone.

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Effect of magnesium on the distribution of tin and lead in Al?Si alloys

Cited by 4 publications

References 2 publications

Influence of Tin Addition on the Microstructure and Mechanical Properties of Al-Si-Cu-Mg and Al-Si-Mg Casting Alloys

Influence of Tin Addition on the Microstructure and Mechanical Properties of Al-Si-Cu-Mg and Al-Si-Mg Casting Alloys

Effect of additives on the mechanical properties and machinability of a new aluminum-copper base alloy /

Effects of Individual and Combined Additions of Pb, Bi, and Sn on the Microstructure and Mechanical Properties of Al-10.8Si-2.25Cu-0.3Mg Alloy

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