The Effect of Trace Levels of Ni And V on the Microstructure and Properties of Four Common Aluminum Alloys

Grandfield, John; Sweet, Lisa; Beer, Aiden; Zhu, Suming; Chen, Xiaobo; Easton, Mark

doi:10.1007/978-3-319-48144-9_161

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…Potentially, Ni dissolution in the Al 15 (FeMn) 3 (Si, Cu) 2 phase can further reduce corrosion resistance because of alteration of dissolution potential. 13) The same could be expected from the cathodic Al 3 (CuNi) 2 phase the formation of which brought a sizeable increase in volume fraction of intermetallics. As for the shape and size of intermetallics, there is a decrease in the circularity and an increase in the size and number of large intermetallics.…”

Section: As-cast Microstructuresmentioning

confidence: 61%

“…10) This raised some studies on the effect of minute Ni impurity in commodity alloys such as AA6060 and AA6063. 13,14) It has been reported that when the Ni content is increased to 500 ppm it tends to either partition in the ¡-Al 15 (Fe, Mn) 3 Si 2 phase or produce the Al 9 FeNi phase which can dissolve up to 4 wt.% Si. It was found that in both cases Ni addition triggers the formation of intermetallics that are less electronegative than Al-, hence reducing resistance to cosmetic corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Phase Composition and Microstructure of High Strength AA6xxx Aluminium Alloys with Nickel Additions

et al. 2023

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High strength AA6XXX series aluminium alloys have become the material of choice for body structures of lightweight automotive vehicles. The properties can be tailored through thermomechanical processing and strict adherence to impurity level. Although some nickelcontaining AA6XXX Al alloys were introduced previously, the effect of Ni addition is still out of significant attention. Presently, an AlMgSiCu alloys with 0.1, 0.2 and 0.3 wt.% Ni addition was studied along with thermodynamic analysis. The predicted intermetallic phases in the as-cast base alloy were Al 15 (Fe, Mn) 3 Si 2 , Al 5 FeSi, Mg 2 Si and Q phases and also Al 3 Ni and Al 3 (CuNi) 2 in the as-cast Ni-added alloys. The Al 3 (CuNi) 2 phase with irregular shape was found in all as-cast Ni-added alloys and Al 9 FeNi phase was also found around dendritic cells in the as-cast alloy containing 0.3 wt.% Ni. After homogenization the Al 3 (CuNi) 2 phase became much leaner in Cu content showing a possible phase transformation occurred. It was found that even at the low Ni content the excess Ni atoms could interact with neighbouring Fe atoms upon heat treatment to form Al 9 FeNi phase and the Cu atoms were released into the matrix. Thus, the Ni addition could not only lead to the loss of Cu atoms available for subsequent age hardening but also reduce Si entrapment associated with Fe-rich intermetallics. Moreover, improved circularity of intermetallics was found due to appearance of the Al 9 FeNi phase that could potentially mitigate the detrimental effects of Fe.

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Section: As-cast Microstructuresmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Phase Composition and Microstructure of High Strength AA6xxx Aluminium Alloys with Nickel Additions

et al. 2023

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“…By increasing the Ni-content, the amount of Al3Ni increased, as observed in the SEM images. The formation of a hard Al3Ni-IMC improves the mechanical strength, which is a very important characteristic of automotive Al-alloys [8,9]. In the literature [10,11] and in ceramic materials, Al3Ni chemical compound has a complex crystal structure (orthorhombic), and works as a dislocation slip resistance.…”

Section: Vickers Hardness Measurementsmentioning

confidence: 99%

Localized Plastic Deformation and Microstructure Properties of Al/Si Alloy Improved with Al3Ni Compound

Alsowidy

2023

jast

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The microstructure of AS10/xNi hypoeutectic alloys with (x = 0.01% and 0.05%) was investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Localized permanent plastic deformation (Vickers hardness (HV)) was conducted on the samples before and after sintering. After sintering, the results showed a significant improvement in hardness with the addition of Ni atoms. From the XRD map, it was found that there was a shift in the peak positions as the Ni atoms were added. This shift is a result of the incoincidence of dhkl levels in the Al-phase before and after the addition of Ni. This mismatch in dhkl levels is associated with the lattice defects and lattice parameters. From the SEM images, the silicon powder particles in the binary composition are large and elongated plates, whereas those in the ternary composition are small and semi-spherical particles. This reduction in the particle size of the modified alloy is attributed to the presence of Ni atoms in the alloys.

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“…However, limited work has been published on the effect of V on grain refinement [43,45,54,55]. It is reported that vanadium addition in the range from 100 ppm to 1000 ppm in aluminium alloys had no observable effect on the grain size [55][56][57][58][59] while the addition of V above 1000 ppm produces adequate grain refinement with increasing V content [43,45,54]. Although it is postulated that the grain refinement observed in the Al-V alloys is due to the formation of pro-peritectic particles, the detailed experimental evidence was not provided [45].…”

Section: Introductionmentioning

confidence: 99%

A grain refinement mechanism of cast commercial purity aluminium by vanadium

Wang

Chiu

Eskin

et al. 2021

Materials Characterization

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The Effect of Trace Levels of Ni And V on the Microstructure and Properties of Four Common Aluminum Alloys

Cited by 6 publications

References 4 publications

Phase Composition and Microstructure of High Strength AA6xxx Aluminium Alloys with Nickel Additions

Phase Composition and Microstructure of High Strength AA6xxx Aluminium Alloys with Nickel Additions

Localized Plastic Deformation and Microstructure Properties of Al/Si Alloy Improved with Al3Ni Compound

A grain refinement mechanism of cast commercial purity aluminium by vanadium

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