Microstructure control and extrudability of Al–Mg–Si alloys microalloyed with manganese

Zając, Stanisław; Hutchinson, Bevis; Johansson, Anders; Gullman, Lars-Otto

doi:10.1179/mst.1994.10.4.323

Cited by 110 publications

(53 citation statements)

References 3 publications

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“…It predicts the formation of a-Al, Al 13 Fe 4 , a-AlFeSi, b-AlFeSi, Mg 2 Si, and Si from the liquid. The absence of Al 13 Fe 4 in the XRD analysis in both the studied samples suggest that the solidification conditions in the NRC process either suppressed this solidification reaction kinetically such that no Al 13 Fe 4 was formed (or sufficient small quantity formed to be bellow the detection limit in XRD) or allowed for subsequent transformation to another phase through other invariant reactions. [25] The absence of Mg 2 Si and Si in the XRD pattern of this alloy billet is likely due to their contents being in low fractions below the detection limit of XRD.…”

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confidence: 99%

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Influence of Grain-Refiner Addition on the Morphology of Fe-Bearing Intermetallics in a Semi-Solid Processed Al-Mg-Si Alloy

Smith

O’Reilly

Kumar

et al. 2013

Metall Mater Trans A

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The three-dimensional morphologies of the Fe-bearing intermetallics in a semisolid-processed Al-Mg-Si alloy were examined after extracting the intermetallics. a c -AlFeSi and b-AlFeSi are the major Fe-bearing intermetallics. Addition of Al-Ti-B grain refiner typically promotes b-AlFeSi formation. b-AlFeSi was observed with a flat, plate-like morphology with angular edges in the alloy with and without grain refiner, whereas a c -AlFeSi was observed as ''flower''-like morphology in the alloy with grain refiner.

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confidence: 99%

“…[13] However, the improvement in properties is counterbalanced by a steep increase in manufacturing costs. Therefore, new cost-effective casting processes need to be developed to tolerate high-impurity contents.…”

mentioning

confidence: 99%

Influence of Grain-Refiner Addition on the Morphology of Fe-Bearing Intermetallics in a Semi-Solid Processed Al-Mg-Si Alloy

Smith

O’Reilly

Kumar

et al. 2013

Metall Mater Trans A

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“…At 60% cumulative reduction and in the range of heat treatment considered, rolled samples allowed for the evolution of strengthening precipitates, permit increase [5,7,8]. The reason for this improve elongation can be attributed to the transformation of platelike β-AlFeSi phase to round α-AlFeSi phase which increases the ductility of the material [3,4]. This was ensured in the study of Zajai et al (1993) [3] by the addition of small amount of manganese.…”

Section: Resultsmentioning

confidence: 94%

“…It has been found that small amount of manganese in AA6063 aluminum alloy significantly helps in homogenizing and transforming the plate-like β-AlFeSi phase to more rounded α-AlFeSi phase, which increases the ductility of the material [3,4]. Aluminum 6063 alloy was processed by upset forging and cold rolling at ambient temperatures and the tensile, ductile and hardness (HRN) properties of the samples were studied [5].…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Treatment on Strength and Ductility of Rolled and Forged Aluminum 6063 Alloy

Adeosun¹,

Balogun²,

Sekunowo³

et al. 2010

JMMCE

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“…[8] In addition, different as-cast Al alloys require varying heat treatment procedures depending on the alloying elements and microstructures. [9] A thick shell zone can affect the surface quality of the extruded products. [10] An as-cast billet should have minimum surface segregation and shell zone in addition to fine secondary phases, fine grains, and cells which are uniformly distributed.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatment on the Surface Structure of 6082 Al Alloys

Bayat

Carlberg

2017

Metall Mater Trans A

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The b-Al 5 FeSi intermetallic phase and coarse Mg 2 Si particles have negative effects on extrudability and workability of 6xxx Al alloys billets. To achieve extruded products with a high surface quality, the as-cast billets are heat-treated before extrusion. During heat treatment, the undesired intermetallic particles, i.e., b-AlFeSi platelets are transformed to rounded a-Al(FeMn)Si intermetallic phases. Although the heat treatment of the bulk areas of the 6xxx Al alloys has been the focus of many previous studies, the process of phase transformation at the very surface has not been paid the same attention. In this study, microstructures of a homogenized billet of a 6082 alloy at the area very close to the surface were investigated. By comparing the X-ray diffraction patterns (XRD) of heat-treated samples as a function of different holding times, the gradual phase transformations could be followed, and using GDOES and map analysis by EDX, the alloying elemental redistribution was analyzed. Partial remelting and porosity growth was detected, and transformation rates were faster than in bulk material and from what is known from industrial processes.

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Microstructure control and extrudability of Al–Mg–Si alloys microalloyed with manganese

Cited by 110 publications

References 3 publications

Influence of Grain-Refiner Addition on the Morphology of Fe-Bearing Intermetallics in a Semi-Solid Processed Al-Mg-Si Alloy

Influence of Grain-Refiner Addition on the Morphology of Fe-Bearing Intermetallics in a Semi-Solid Processed Al-Mg-Si Alloy

Effects of Heat Treatment on Strength and Ductility of Rolled and Forged Aluminum 6063 Alloy

Influence of Heat Treatment on the Surface Structure of 6082 Al Alloys

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