Effects of Sn Addition on Microstructure, Extrudability, Mechanical Properties and Machinability of a 6082 Alloy

Røyset, Jostein; Sæter, Jan Anders; Ustad, Terje; Reiso, Oddvin

doi:10.4028/www.scientific.net/msf.396-402.1205

Cited by 11 publications

(18 citation statements)

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“…That Fe-Sn diagram has an eutectic point at ∼230 • C and a melting peak at 200 • C was observed in the DSC experiment of the alloy M2S. Apparently, there was no formation of Mg 2 Sn, which has been observed by other authors in Al-Mg-Si-Sn alloys [5]. Although Mg 2 Si was not observed, some Mg 2 Si must have formed in the M1S alloy, since no other Mg bearing phase was detected and the DSC run of the solution heat treated alloy indicated that some precipitation other than Si should be taking place in the alloy.…”

Section: Differences Between Alloys 356 and A356 And The Effect Of Snsupporting

confidence: 48%

“…In another piece of work from the same group [18], it was reported that adding Sn to a Al-11Si-0.35Mg alloy slowed down the Mg 2 Si precipitation, but increased the amount of precipitates because Sn precipitation at dislocations acted as nucleation sites. Røset et al [5] have studied Sn additions of 0.28 and 1 wt.% Sn on a 6082 alloy and observed a decrease in hot deformation resistance and in the critical temperature for tearing; it was also noted that Sn had a strong effect on the age hardening response and 0.28 wt.% Sn improved the strength, while 1 wt.% Sn reduced it.…”

Section: Introductionmentioning

confidence: 95%

“…Alternatively, it can be used as a trace element (∼0.05%) to enhance precipitation hardening in Al-Cu or Al-Cu-Mg alloys, due to its strong interaction with vacancies [3]. Other applications have been suggested, for example, Sercombe and Schaffer studied the influence of various trace elements on the Al-Cu alloy sintering rate and concluded that among Pb, In, Bi, Sb, Ni, Zn, Sn and Si, the most effective sintering aid was Sn [4]; Røset et al [5] added 0.28 and 1 wt.% Sn to a 6082 alloy with the intent of increasing its machinability without interfering in its extrudability; and Vieira et al [6] found that in an A356 alloy for thixocasting, the addition of Sn increases the liquid wettability without interfering in the morphology and coarsening rate of the solid phase. In addition, it considerably reduced the viscosity and thixotropy of an Al-7Si-0.3 Mg alloy, leading to better flow behaviour of the semi-solid state.…”

Section: Introductionmentioning

confidence: 97%

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The influence of impurity level and tin addition on the ageing heat treatment of the 356 class alloy

Kliauga

Vieira

Ferrante

2008

Materials Science and Engineering: A

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Section: Differences Between Alloys 356 and A356 And The Effect Of Snsupporting

confidence: 48%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

The influence of impurity level and tin addition on the ageing heat treatment of the 356 class alloy

Kliauga

Vieira

Ferrante

2008

Materials Science and Engineering: A

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“…Also, the addition of Bi to Mg- Royset et al 128 reported that an addition of 0.28% Sn is insufficient to improve the chip 64 formation in the "turning of extruded 6082 alloy; increasing the Sn content to 1%, however, produces excellent chip formation. Furthermore, the chip formation is observed to improve considerably when the hardness of the alloy is increased.…”

Section: According To Smolejmentioning

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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“…Apparently, no Mg2Sn formation has been observed in Al-Mg-Si-Sn alloys by other authors. 264 To date the equilibrium diagram of Al-Si-Sn ternary system has never been reported. The phase transformation of the crystallization processes for the alloys may be analyzed, however, by means of the three known binary systems.…”

Section: Resultsmentioning

confidence: 99%

Effet des additifs sur la microstructure et les propriétés mécaniques des alliages d'aluminium-silicium /

Mohamed¹

2008

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Dedicated to my parents, Reham and my little Mahmoud RESUMELes alliages aluminium-silicium, particulièrement à la composition eutectique, sont souvent employés dans l'industrie de l'automobile en raison de leur de faible densité relative à des matériaux traditionnels. Les propriétés mécaniques de tels alliages sont déterminées principalement par les constituants microstructuraux de leur structure après la coulée, les morphologies et les quantités de leurs phases intermétalliques. Dans l'état non modifié, les alliages Al-Si montrent un silicium eutectique ayant une forme aciculaire ou lamellaire, de ce fait, ces alliages ont tendance à montrer de faibles résistance et ductilité. Ainsi, les alliages avec une structure principalement eutectique doivent subir la modification afin d'assurer des propriétés mécaniques adéquates. La qualité de du produit coulé peut être améliorée par affînement des grains, ceci permet de réduire la taille des grains primaires de la phase a-aluminium qui solidifie autrement dans une structure de grain grossière. La production des alliages Al-Si avec une stracture et des propriétés mécaniques améliorées implique l'application de deux processus principaux : (i) addition de tels éléments d'alliage comme Mg, Cu, Mn, et autres éléments semblables, pendant l'état liquide; et (ii) traitement thermique. Les éléments de microalliage ou éléments de trace utilisés dans les alliages commerciaux d'aluminium sont de 0.5 à 1.0 % en poids de Pb, Bi, Sn et In, qui ont peu ou pas de solubilité en aluminium, c.-à-d. ils ont des coefficients de distribution extrêmement bas.L'influence du fer (0.5-1 % en poids), du manganèse (0.5-1 % en poids), du cuivre (2.25-3.25 % en poids), et du magnésium (0.3-0.5 % en poids), aussi bien que celle des éléments Pb, Bi, Sn, et In, sur la microstructure et les propriétés mécaniques de l'alliage préeutectique Al-10.8%Si modifié et raffiné a été étudiée dans deux conditions, à savoir, tel En matière de l'addition des éléments d'alliage, les résultats prouvent que l'effet de modification du Sr diminue à mesure que la quantité de cuivre et de magnésium supplémentaires est augmentée, en raison des interactions entre ces éléments, ce qui cause une ségrégation grave des phases d'A^Cu dans les secteurs loin du silicium eutectique modifié et change la séquence de précipitation de la phase «-Ali5(Fe,Mn)3SÍ2 d'une réaction post-dendritique à pré-dendritique où l'intermétallique est observé pour se produire dans les dendrites d'à-AL Dépendant de la teneur en Fe et en Mn dans l'alliage, une grande variation dans la phase a est observée sous forme de particules formées polyhédrales connues sous le nom de « sludge ». La phase d'A^Cu est vue pour se dissoudre presque totalement pendant le traitement thermique de mise en solution, alors que les phases AlsCuaMggSió et les phases intermétalliques du fer 0f-Ali5(Fe,Mn)3SÍ2 s'avèrent pour persister pour tous les alliages étudiés, particulièrement ceux qui contiennent les niveaux élevés du Mg et du Fe. La phase intermétallique de fer de B-Als(F...

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Effects of Sn Addition on Microstructure, Extrudability, Mechanical Properties and Machinability of a 6082 Alloy

Cited by 11 publications

References 0 publications

The influence of impurity level and tin addition on the ageing heat treatment of the 356 class alloy

The influence of impurity level and tin addition on the ageing heat treatment of the 356 class alloy

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

Effet des additifs sur la microstructure et les propriétés mécaniques des alliages d'aluminium-silicium /

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