The Semi-Solid Forming of an Improved AA6061 Wrought Aluminum Alloy Composition

Langlais, Joseph; Andrade, Neivi; Lemieux, Alain; Chen, X. Grant; Bucher, Laurent

doi:10.4028/3-908451-59-0.511

Cited by 4 publications

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“…Des travaux antérieurs ont démontré que des modifications à la composition chimique d'un alliage AA6061 jumelée aux avantages associés aux procédés de rhéomoulage contribuent fortement à la réduction de l'incidence des déchirures à chaud [2]. Ainsi, il pourrait en être de même pour les alliages Al-Cu de la série 206.…”

Section: Objectifs De Rechercheunclassified

Effets du Si, Cu et Fe sur les propriétés statiques et dynamiques d'un alliage 206 (Al-Cu) en semi-solide produit par le procédé SEED /

Lemieux¹

2012

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IILes conclusions de ces travaux démontrent des progrès significatifs en identifiant les principaux facteurs reliés à la faisabilité de pièces de haute performance avec l'alliage 206 à partir du procédé SEED. Cette recherche constitue donc un travail de fond sur les développements de nouveaux alliages Al-Cu pour les procédés de semi-solide et, du même coup, à l'expansion de l'aluminium pour des applications de haute performance. N. B. Le présent mémoire fait partie d'un projet de recherche élaboré par la Chaire industrielle de recherche CRSNG et RIO TINTO ALCAN sur les nouvelles avenues en métallurgie de la transformation de I 'aluminium (CIMTAL). III SUMMARY EFFECTS OF SI, CU AND FE ON STATIC AND DYNAMIC PROPERTIES OF ALLOY 206 (AL-CU) IN SEMI-SOLIDS PRODUCED BY THE SEED PROCESSThe advantages of producing metal parts by rheocasting are generally recognised for common foundry alloys of Al-Si. However, other more performing alloys in terms of mechanical properties could have a great interest in specialized applications in the automotive industry, while remaining competitive in the forming. Indeed, the growing demand for more competitive products requires the development of new alloys better suited to semi-solid processes. Among others, Al-Cu alloys of the 2XX series are known for their superior mechanical strength. However, in the past, 2XX alloys were never candidates for pressure die casting. The main reason is their propensity to hot tearing.Semi-solid processes provide better conditions for molding with the rheological behavior of dough and molding temperatures lower reducing this type of defect.In the initial phase, this research has studied factors that reduce hot tearing susceptibility of castings produced by semi-solid SEED of alloy 206. Subsequently, a comparative study on the tensile properties and fatigue was performed on four variants of the alloy 206. The results of tensile strength and fatigue were compared with the specifications for applications in the automotive industry and also to other competing processes and alloys.During this study, several metallurgical aspects were analyzed. The following main IV points have been validated: i) the main effects of compositional variations of silicon, iron and copper alloy Al-Cu (206) on the mechanical properties, and ii) certain relationships between the mechanism of hot cracking and the solidification rate in semi-solid.Parts produced from the semi-solid paste coming from the SEED process combined with modified 206 alloys have been successfully molded and achieved superior mechanical properties than the requirements of the automotive industry. The fatigue properties of the two best modified 206 alloys were higher than those of A357 alloy castings and are close to those of the wrought alloy AA6061.At present, there is simply no known application for pressure die-cast alloy with 206 (Liquid Die-casting). This is mainly due to the high propensity to hot cracking and limitations facing the part geometry and the subsequent assembly. This study demonstrated that...

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Section: Objectifs De Rechercheunclassified

Effets du Si, Cu et Fe sur les propriétés statiques et dynamiques d'un alliage 206 (Al-Cu) en semi-solide produit par le procédé SEED /

Lemieux¹

2012

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“…The first mold had a "U" shape to better assess the filling behavior as well as the hot tearing sensitivity. Indeed, this geometry was selected because it contained features such as corner radii and section changes that contributed to promote stress concentration and hot tearing [3]. The second series of castings used a rectangular wedge mold that was designed to optimize the number of test bars for mechanical property evaluations.…”

Section: A) Seed Process and Die Castingmentioning

confidence: 99%

“…The hot tearing susceptibility (HTS) index on the castings was determined using liquid dye penetrant. The index was based on the number of hot tears and their lengths [3]. A series of wedge shape castings was produced from which test specimens were cut for tensile and fatigue testing as well as metallographic analyses.…”

Section: A) Seed Process and Die Castingmentioning

confidence: 99%

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Effect of Si, Cu and Fe on mechanical properties of cast semi-solid 206 alloys

Lemieux¹,

Langlais²,

Bouchard³

et al. 2010

Transactions of Nonferrous Metals Society of China

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“…In the SSM-HPDC, the use of alloys with low content of alloying elements is not very typical due to narrow freezing intervals that makes difficulties in slurry preparation process and increases inhomogeneity in the microstructure of the final product [2]. However, compared to the standard HPDC, SSM-HPDC can offer better castability for the alloys susceptible to shrinkage porosity, due to higher fraction of α1-Al phase with average shape factor, 2 p A SF   nearer to 1 (round shape) [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of Microstructural Inhomogeneity on Fracture Behaviour in SSM-HPDC Al-Si-Cu-Fe Component with Low Si Content

Payandeh

Jarfors

Wessén

2014

SSP

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PostprintThis is the accepted version of a paper published in Solid State Phenomena. This paper has been peerreviewed but does not include the final publisher proof-corrections or journal pagination. Abstract. In the current paper, a low-Si aluminium alloy (1.4-2.4% Si) was used to fabricate a complex shape telecom component using Semi-Solid High-Pressure Die Cast (SSM-HPDC), process. Microstructure and fracture characteristics were investigated. The cast material exhibited microstructural inhomogeneity, in particular macrosegregation in the form of liquid surface segregation bands in addition to sub-surface pore bands and gross centre porosity. Tensile specimens were taken from the cast components. Elongation and microstructural inhomogeneity were investigated and correlated. Fracture surfaces of the tensile specimen were examined under scanning electron microscope (SEM). The study showed that both near surface liquid segregation bands and subsurface porosity strongly affected the fracture behaviour. Dominant for loss of ductility was gross centre porosity. The centre porosity was found to be a combination of trapped gas and insufficient, irregular feeding patterns.

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The Semi-Solid Forming of an Improved AA6061 Wrought Aluminum Alloy Composition

Cited by 4 publications

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Effets du Si, Cu et Fe sur les propriétés statiques et dynamiques d'un alliage 206 (Al-Cu) en semi-solide produit par le procédé SEED /

Effets du Si, Cu et Fe sur les propriétés statiques et dynamiques d'un alliage 206 (Al-Cu) en semi-solide produit par le procédé SEED /

Effect of Si, Cu and Fe on mechanical properties of cast semi-solid 206 alloys

Influence of Microstructural Inhomogeneity on Fracture Behaviour in SSM-HPDC Al-Si-Cu-Fe Component with Low Si Content

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