Semi-solid near-net shape rheocasting of heat treatable wrought aluminum alloys

Curle, Ulyate Andries

doi:10.1016/s1003-6326(09)60364-2

Cited by 43 publications

(40 citation statements)

References 22 publications

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“…Also, the Mg requirement to achieve this strength is significantly higher for 6082 than for the casting alloys ( Table 1). The ductility of the 6082 is relatively low when compared to its wrought counterpart [5] and the casting alloys ( Table 2). …”

Section: Resultsmentioning

confidence: 99%

Comparison of the Heat Treatment Response of SSM-HPDC 6082 and 6004 Wrought Alloys with A356 and F357 Casting Alloys

Möller¹,

Govender²,

Stumpf

2011

MSF

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Semi-solid metal high pressure die casting was used to produce plates from traditional wrought AlMg-Si alloys 6082 and 6004, as well as from traditional casting Al-Si-Mg alloys A356 and F357. The high Si-content of the casting alloys offer several advantages, including a faster artificial aging response, higher strength for comparable Mg contents and less sensitivity to prior natural aging on peak strength. However, over-aging occurs earlier in the casting alloys than in the wrought alloys. IntroductionThe Al-Si-Mg alloys that constitute the 6000 series wrought alloys and 300 series casting alloys are heat treatable and depend on age-hardening to develop enhanced strength properties [1]. The main difference between the 300 series and 6000 series is the Si content, with the casting alloys containing a significantly higher quantity [1]. Silicon promotes castability mainly because of the high fluidity imparted by the presence of large volumes of the Al-Si eutectic [1]. The lack of research on the precipitation sequence in Al-Si-Mg casting alloys compared with the Al-Mg-Si wrought alloys has recently been highlighted [2]. In Al-Si-Mg alloys in general, the decomposition of the supersaturated solid solution (SSS) is believed to occur as follows [3]: SSS → (Mg + Si) clusters / GP(I) spherical → β″ / GP (II) needles → β rods ′ → β plates , where GP = Guinier-Preston zones, β = equilibrium Mg 2 Si, β′ and β″ = metastable precursors of β. Semi-solid metal (SSM) processing is a unique manufacturing method to produce near-net shape products for various industrial applications. The aim is to obtain a semi-solid structure which is free of dendrites and with the solid constituent present in a near spherical form. Casting alloys A356/7 are probably the most popular alloys used for SSM forming [4], but one of the main advantages of SSM processing is that it is also possible to produce near net-shape components from alloys that are conventionally wrought such as the 6000 series [5]. The purpose of this paper is to compare the aging response of 6000 series wrought alloys with A356/7 casting alloys produced with the same processing technique with the advantage of having comparable globular primary α-Al microstructures.

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Section: Resultsmentioning

confidence: 99%

Comparison of the Heat Treatment Response of SSM-HPDC 6082 and 6004 Wrought Alloys with A356 and F357 Casting Alloys

Möller¹,

Govender²,

Stumpf

2011

MSF

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“…It has been already engaged of all unconventional technologies to the research such as casting with crystallization pressure (direct and indirect) [2,3] or semi-solid metals casting [4][5][6]. Investigated are the alloys of 2xxx, 6xxx and 7xxx series because they offer the highest mechanical properties [7,8]. One of the difficulties in casting of these alloys is a wide solidification range that cause higher tendency to the formation of defects during solidification, for example shrinkage porosity and hot tears [9,10].…”

Section: Introductionmentioning

confidence: 99%

EN AW-2024 Wrought Aluminum Alloy Processed by Casting with Crystallization under Pressure

Vanko

Stancek

Moravčík

2017

Strojnícky Casopis – Journal of Mechanical Engineering

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By using the wrought aluminum alloys can be created castings with higher mechanical properties than the castings made of standard foundry aluminum alloys, but it is necessary to handle the process of making sound castings without any defects such as hot tears and shrinkage porosity. In experiments, we have been studied of wrought aluminum alloy EN AW-2024 which has been processed by the casting with crystallization under pressure with forced flow. Castings were heat treated by standard T6 heat treatment.KEYWORDS: wrought aluminum alloy, EN AW-2024, casting with crystallization under pressure, mechanical properties IntroductionAlthough aluminum alloys do not belong to the latest breakthrough materials [1], they are currently at the top in terms of their use in worldwide practice. Castings made of foundry aluminum alloys has probably reached its top in terms of mechanical properties and probably neither on-coming casting technology does not produce castings with higher mechanical properties. Therefore, in order to take advantage of casting technology in comparison with forming technology, for example higher shape complexity of the products, came a time of examination of wrought aluminum alloys usability in the production of castings. It has been already engaged of all unconventional technologies to the research such as casting with crystallization pressure (direct and indirect) [2,3] or semi-solid metals casting [4][5][6]. Investigated are the alloys of 2xxx, 6xxx and 7xxx series because they offer the highest mechanical properties [7,8]. One of the difficulties in casting of these alloys is a wide solidification range that cause higher tendency to the formation of defects during solidification, for example shrinkage porosity and hot tears [9,10]. The aim of this research is to investigate the effects of casting parameters (pouring temperature and die temperature) in the casting with crystallization under pressure with forced flow [11] on the mechanical properties and microstructure of castings made of wrought aluminum alloy EN AW-2024 in the as-cast state and after heat treatment. Material and methodsExperimental material was prepared using four different ways of casting with crystallization under pressure with forced flow (Tab. 1). Castings were cup-shaped ( Fig. 1) with a height of approximately 130 mm, a wall thickness of 15 mm and bottom thickness of about 20 mm (depending on the height of casting).

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“…The main issue with thixoforming process is the cost associated with an intermediate pre-fabricated billet, which makes the overall process economically impractical. Rheocasting is a reliable semisolid processing that the semisolid slurry is produced directly from liquid phase [4][5]. In the rheocasting process, the liquid metal is stirred while it is simultaneously cooled down to obtain the desired processing temperature corresponding to a predetermined solid faction.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Rheological Properties of Semi-Solid 7075 Slurries Using SEED Rheocasting Process

Bolouri

Zhao

Côté

et al. 2016

SSP

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The SEED rheocasting process was used to produce semisolid slurries of high strength 7075 aluminum wrought alloys. The effects of the SEED processing parameters on the microstructure of semisolid slurries were studied. The impact of grain refinement on the grain morphology and size was investigated. The rheological properties of semisolid 7075 alloys were characterized at different solid fractions using a parallel plate compression viscometer. Results indicated that the grain refinement could greatly improve the globularity of α-Al grains and rheoformability. The relationships between viscosity and shear rate at different solid fractions in the transient state for both unrefined and refined semisolid slurries were evaluated and discussed.

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Semi-solid near-net shape rheocasting of heat treatable wrought aluminum alloys

Cited by 43 publications

References 22 publications

Comparison of the Heat Treatment Response of SSM-HPDC 6082 and 6004 Wrought Alloys with A356 and F357 Casting Alloys

Comparison of the Heat Treatment Response of SSM-HPDC 6082 and 6004 Wrought Alloys with A356 and F357 Casting Alloys

EN AW-2024 Wrought Aluminum Alloy Processed by Casting with Crystallization under Pressure

Microstructure and Rheological Properties of Semi-Solid 7075 Slurries Using SEED Rheocasting Process

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