The Roles of Ni and Co in Dendritic Growth and Tensile Properties of Fe‐Containing Al–Si–Cu–Zn Scraps under Slow and Fast Solidification Cooling

Xavier, Marcella G. C.; Freitas, Brenda Juliet Martins; Gouveia, Guilherme Lisboa de; Garcia, Amauri; Spinelli, José Eduardo

doi:10.1002/adem.202100822

Cited by 8 publications

(9 citation statements)

References 42 publications

(57 reference statements)

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“…A single dendritic scaling relation may be typified by a power function, as can be seen in Figure 4(c). The -0.5 exponent described the dendritic development, being typical of those reported for multicomponent Albased alloys [16]. The primary spacing varied from an average value of approximately 440 µm in the non-treated zone (i.e., the DS samples) to a spacing of about 1.38 µm in the top part of the resolidified zones of the investigated alloys, i.e., a remarkable decrease in length scale.…”

Section: Resultssupporting

confidence: 60%

Understanding Ni-modified AlSi10Mg alloys from slow to rapid solidification

Moura

Gouveia

Figueira

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Al-Si-Mg alloys are widely employed in a variety of industries, including aerospace, automotive, and microelectronics. This is because of its low density, acceptable mechanical properties, acceptable corrosion resistance, and inexpensive application cost. Because of its advantageous fluidity, limited solidification interval, and low volumetric contraction, Al-(9-11) wt.% Si-(0.2-0.5) wt.% Mg casting alloys have been employed in Laser-Powder Bed Fusion (LPBF) printing techniques. Despite being used as commercial alloys, their mechanical properties still need to be improved. In line with this, the current focus of aluminum-based alloys development for additive manufacturing is mostly on the modification of commercially available alloys. One of the possibilities is the reinforcement of cast alloys that may be processed using additive manufacturing technologies. Nickel is used as an alloying element in this study to generate the Al3Ni intermetallic, which is distinguished by its improved strength. Furthermore, the thermal stability of the Al3Ni may be a benefit, particularly for high-temperature applications. Under such context, the present study aims to investigate the solidification under low and high cooling rates of three alloys: AlSi10Mg-1Ni, AlSi10Mg-2Ni, and AlSi10Mg-3Ni (wt.%). Samples were obtained by directional solidification (DS) and laser surface remelting (LSR) and the cooling rates were calculated for both DS samples and with extrapolation for the more refined LSR samples as well as with the use of models from the literature. With the increase in Ni content, the Al3Ni mass fraction increased from 3% to 5% and then to 7.5%, according to CALPHAD computations. The growth rate of the DS samples was lowered in the direction of Ni addition: 1 Ni > 2Ni > 3 Ni. SEM data will be presented, with a focus on the rapid solidified melt pool samples and their features.

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Section: Resultssupporting

confidence: 60%

Understanding Ni-modified AlSi10Mg alloys from slow to rapid solidification

Moura

Gouveia

Figueira

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The − 0.5 exponent described the dendritic development for these alloys in Fig. 7(a), being typical of those reported for multicomponent Al-based alloys [40]. However, a -0.4 exponent has characterized the experimental λ 1 variation for the ternary AlSi10Mg alloy.…”

Section: Directional Solidi Cation: Cooling Path Microstructures and ...supporting

confidence: 72%

Laser Remelting of AlSi10Mg(-Ni) Alloy Surfaces: Influence of Ni Content and Cooling Rate on the Microstructure

Moura¹,

Gouveia²,

Figueira³

et al. 2022

Preprint

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AlSi10Mg alloys are widely employed in a variety of industries, including aerospace, automotive, and microelectronics. This is because of its low density, acceptable mechanical properties, acceptable corrosion resistance, and inexpensive application cost. Advantageous fluidity, a short solidification period, and minimal volumetric contraction are beneficial characteristics under processing such alloys. Despite being used as commercial alloys, the mechanical properties of the AlSi10Mg alloys still need to be improved. In line with this, the current focus of Al-based alloys development is mostly on modifying commercially available alloys. Under such context, Ni was used as an alloying element in this study to generate the Al3Ni intermetallics, distinguished by its improved mechanical strength. Furthermore, the thermal stability of the Al3Ni may be a benefit, particularly for high-temperature applications. The present study aims to investigate the solidification under low and high cooling rates of four alloys: AlSi10Mg, AlSi10Mg-1Ni, AlSi10Mg-2Ni, and AlSi10Mg-3Ni (wt.%). Samples were obtained by directional solidification (DS) and laser surface remelting (LSR) processes. The cooling rates were calculated for the DS samples and with extrapolation for LSR samples as well as with the use of a model from the literature. After testing several laser conditions, the results also include an examination of microstructural and hardness changes in the treated and untreated zones. The produced gradient of microstructures is fully characterized as well as used to evaluate cooling rates inside the laser molten pools. For energy densities of 400 J/mm2 and 100 J/mm2, the mean dendritic spacings, λ, of the three Ni-containing alloys at the laser molten pool yelded estimated cooling rates of approximately 1.5 104 oC/s and 4.7 104 oC/s, respectively. A model explaining the reversion of λ across the molten pool will be outlined.

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“…Some of the Fe-based intermetallics have a Chinese letter morphology [30]. Even with relatively high cooling rates and dendritic fineness of the CC samples, well-distributed particles with a more rounded shape could not be observed [15]. In sum, the microstructures were constituted by an -Al dendritic matrix, Si and AlFeSi / AlFeSi(Ni) /…”

Section: Sdas and Secondary Phases Under Slow And Fast Solidificationmentioning

confidence: 97%

“…Processing route to which a material is subjected is closely linked to its final properties, including electrochemical ones [14][15][16]. The secondary dendrite arm spacing (SDAS) is considered the main technical feature used to evaluating casting alloys and their properties.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance of Fe-Contaminated Al-Si-CU-Zn Alloys Modified With NI and Co and with Variable Secondary Dendrite Arm Spacing

Xavier¹,

Freitas²,

Koga³

et al. 2022

Preprint

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The corrosion behavior of Fe-containing directionally solidified (DS) and centrifugally cast (CC) Al-Si-Cu-Zn alloys with either Co or Ni additions has been investigated. Electrochemical and immersion corrosion methods were used to investigate the corrosion behavior in 0.6 M NaCl after short (1-hour) and long (30-day) exposure periods. The employed solidification methods allowed the production of samples with a wide range of secondary dendrite arm spacing (SDAS) while preserving Si and Fe-containing phases. The 0.5 wt.% Ni and Co additions led to the growth of the AlFeSi(Ni) and AlFeSi(Co) phases, but no binary AlNi nor AlCo intermetallic par-ticles have been generated. Potentiodynamic polarization studies at early exposure revealed an increase in the corrosion potential as the Ni was added for either fast or slow solidified samples. The electrochemical impedance spectroscopy at early exposure demonstrated that the Ni-modified alloy, on the other hand, was associated to smaller charge transfer resistances, in-dicating a reduction in corrosion resistance after short elapsed time into the electrolyte. Howev-er, 30-day immersion tests revealed much lower corrosion rate of the Ni-modified alloy than the other alloys, while the corrosion rates of the Co-modified and non-modified alloys were simi-lar. In the Ni-containing alloy, decreased corrosion rate under long-term corrosion process was attributed to the formation of a thick and dense alumina layer, effectively protecting the surface under such conditions. This work contributes to a better knowledge of the corrosion behavior of Ni- and Co-corrected Al industrial scrap compositions.

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The Roles of Ni and Co in Dendritic Growth and Tensile Properties of Fe‐Containing Al–Si–Cu–Zn Scraps under Slow and Fast Solidification Cooling

Cited by 8 publications

References 42 publications

Understanding Ni-modified AlSi10Mg alloys from slow to rapid solidification

Understanding Ni-modified AlSi10Mg alloys from slow to rapid solidification

Laser Remelting of AlSi10Mg(-Ni) Alloy Surfaces: Influence of Ni Content and Cooling Rate on the Microstructure

Corrosion Resistance of Fe-Contaminated Al-Si-CU-Zn Alloys Modified With NI and Co and with Variable Secondary Dendrite Arm Spacing

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