Microstructure and Properties of a Novel Al-Mg-Si Alloy AA 6086

Zupanič, Franc; Steinacher, Matej; Žist, Sandi; Bončina, Tonica

doi:10.3390/met11020368

Cited by 27 publications

(16 citation statements)

References 21 publications

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“…The dispersoids were small and uniformly distributed next to the interdendritic spaces. This distribution was similar to the basic AA 6086 alloy [10], where α-AlMnSi and t-Al 3 Zr prevailed. The long needles dominated at the dendrite centres, and closer inspection showed that spherical precipitates were uniformly distributed in the region between the plates.…”

Section: T6 Temper Of the Investigated Alloyssupporting

confidence: 73%

“…The alloy AA 6086 has previously been investigated in detail [10,33]. In this contribution, different effects of Sc addition will be presented.…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, its ductility still surpasses 10%. The alloy AA 6086 also contain Zr, which causes additional strengthening and resistance to grain growth by Al 3 Zr dispersoids, in addition to Mn-rich dispersoids [10]. The alloy is successfully used in the automotive industry, especially as forged steering rods.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Scandium on the Microstructure of the Aluminium Alloy AA 6086

et al. 2022

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The investigation studied the effects of 0.2 wt.% and 1 wt.% scandium (Sc) additions on the microstructure of the aluminium alloy AA 6086 in different conditions. The alloys were produced by casting into a metallic mould, followed by various heat treatments. The alloys were examined using light microscopy, scanning and transmission electron microscopy, microchemical analysis, differential scanning calorimetry and X-ray diffraction. The phase compositions and solidification sequences were modelled using the CALPHAD approach, which reasonably agreed with the experimental results. The addition of Sc to AA 6086 strongly reduced the grain size of the Al-rich solid solution and induced the appearance of Sc-rich phases AlSc2Si2 and L12-Al3X. Other phases identified in the Sc-free alloy were also found in the Sc-modified alloys. Homogenisation caused the dissolution of most phases and the formation of different types of dispersoids. In the alloy with 0.2% Sc, the distribution of dispersoids was not uniform. The plate-like AlMnCrSi dispersoids formed mainly at the dendrite centres, together with spherical L12 precipitates, while smaller α-AlMnSi and tetragonal t-Al3Zr dispersoids were created elsewhere. The addition of 0.2% Sc did not considerably affect the strengthening of AA 6086. The precipitation during isothermal ageing was slightly delayed and shifted to higher temperatures during continuous heating.

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Section: T6 Temper Of the Investigated Alloyssupporting

confidence: 73%

“…The alloy AA 6086 has previously been investigated in detail [10,33]. In this contribution, different effects of Sc addition will be presented.…”

Section: Resultsmentioning

confidence: 99%

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The Effect of Scandium on the Microstructure of the Aluminium Alloy AA 6086

et al. 2022

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“…The alloy AA 6086 is a wrought alloy used for extruded products in demanding automotive industry applications, such as forged steering rods, developed recently. It was developed from AA 6082 by modifying its chemical composition, mainly by changing the ratio Si:Mg and adding some Zr and Cu [51]. Its tensile strength can exceed 480 MPa in T6 temper, while the ductility still surpasses 10%.…”

Section: Introductionmentioning

confidence: 99%

Dispersoids in Al-Mg-Si Alloy AA 6086 Modified by Sc and Y

et al. 2023

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The aluminium alloy AA 6086 attains the highest room temperature strength among Al-Mg-Si alloys. This work studies the effect of Sc and Y on the formation of dispersoids in this alloy, especially L12-type ones, which can increase its high-temperature strength. A comprehensive investigation was carried out using light microscopy (LM), scanning (SEM), and transmission (TEM) electron microscopy, energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and dilatometry to obtain the information regarding the mechanisms and kinetics of dispersoid formation, particularly during isothermal treatments. Sc and Y caused the formation of L12 dispersoids during heating to homogenization temperature and homogenization of the alloys, and during isothermal heat treatments of the as-cast alloys (T5 temper). The highest hardness of Sc and (Sc + Y) modified alloys was attained by heat-treating alloys in the as-cast state in the temperature range between 350 °C and 450 °C (via T5 temper).

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“…Alloying with zirconium and scandium is especially common for 5XXX group alloys, i.e., with a high content of magnesium [22,23], however, it is effectively used also in other aluminum alloy systems [24]. In recent years, active research on the use of these additives in 6XXX series alloys has been started [25][26][27][28]. In the future, it is possible to achieve a significant increase in strength due to the combined effect of grain refinement, and the simultaneous usage of strengthening particles Al3(ScZr) and β'' (Mg5Si6).…”

Section: Introductionmentioning

confidence: 99%

Influence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon

Aryshenskii

Lapshov

Hirsch

et al. 2021

Metals

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This research is devoted to the study effects of complex alloying of Al-0.3 wt. % Mg-1 wt. % Si and Al-0.5 wt. % Mg-1.3 wt. % Si alloys by small additions of Sc and Zr on the microstructure in the as-cast condition. The effect of small additions of these elements on the microhardness, electrical conductivity, grain size and phase composition of the indicated alloy systems was studied. The methods of optical and electron microscopy were used for the study. Moreover, the phase composition was calculated using the Thermo-Calc software package. The study showed a strong effect of the chemical composition of investigated alloys on the size of the grains, which, with a certain combination of additives, can decrease several times. Grain refinement occurs both due to supercooling and formation of primary Al3Sc particles in the liquid phase. Alloys based on Al-0.5 wt. % Mg-1.3 wt. % Si are more prone to the formation of this phase since a lower concentration of Sc is required for it to occur. In addition, more silicon interacts with other elements. At the same time, Al-0.3 wt. % Mg-1 wt. % Si requires lower temperature for complete dissolution of Mg2Si, which can contribute to more efficient heat treatment, which includes reducing the number of steps. TEM data show that during ingot cooling (AlSi)3ScZr dispersoid precipitates. This dispersoid could precipitate as coherent and semi-coherent particles with L12 structure as well as needle-shaped particles. The precipitation of coherent and semi-coherent particles during cooling of the ingot indicates that they can be obtained during subsequent multistage heat treatment. In addition, in the Al0.5Mg1.3Si0.3Sc alloy, metastable β″ (Mg5Si6) are precipitated.

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Microstructure and Properties of a Novel Al-Mg-Si Alloy AA 6086

Cited by 27 publications

References 21 publications

The Effect of Scandium on the Microstructure of the Aluminium Alloy AA 6086

The Effect of Scandium on the Microstructure of the Aluminium Alloy AA 6086

Dispersoids in Al-Mg-Si Alloy AA 6086 Modified by Sc and Y

Influence of the Small Sc and Zr Additions on the As-Cast Microstructure of Al–Mg–Si Alloys with Excess Silicon

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