Development of Al–Nb–B master alloy with high Nb/B ratio for grain refinement of hypoeutectic Al–Si cast alloys

Xu, Jie; Li, Y.; Hu, Bin; Jiang, Ying; Li, Q.

doi:10.1007/s10853-019-03915-9

Cited by 67 publications

(12 citation statements)

References 48 publications

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“…Overall the reduction in average grain size was 438% (from 96µm to 221µm) compared to the base alloy without the addition of the inoculant. The Works of Xu [16][17][18] bring the development of Al-Nb-B master alloy with a high Nb/B ratio for grain refinement where was the in-situ observation of grain refinement dynamics and the effect of Agglomeration on Nucleation Potency of Inoculant Particles in the Al-Nb-B Master Alloy [16][17][18]. The results were in the same line as found in this work.…”

Section: Resultssupporting

confidence: 80%

Recycling of the Al Scrap: The Effect of Adding Inoculant Nb+B and Mg with Subsequent Heat-Treatment in the Mechanical Behavior of Al Alloy

Narducci¹,

N²,

AJ³

2021

annmaterialsscieng

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A new perspective for the use of Al-Si alloys produced with recycled Al (with Fe>1%) in Gravity Die Casting (GDC) processes. To study the morphology of ß-Fe precipitates and the material’s mechanical properties were added the inoculate via Nb+B and the element Mg with subsequent heat treatment. The samples were cast in Al10Si1Fe0.35Mg alloy in a metal mould according to ASTM B108. The microstructure was analyzed with BSE-SEM and EDS. The work investigated the morphology of ß-Fe precipitates and their effects and interactions on the material’s mechanical properties. The combined effect resulted in reduced size and shape of ß-Fe precipitates, thereby improved higher yield strength (YS = 207.71 MPa), ultimate tensile strength (UTS = 300.35 MPa), and elongation of 4.66%, exceeding the strength and elongation limit values found in commercial alloys, such as ASTM A357 alloy, where the Fe content is low (max. 0.2%).

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Section: Resultssupporting

confidence: 80%

Recycling of the Al Scrap: The Effect of Adding Inoculant Nb+B and Mg with Subsequent Heat-Treatment in the Mechanical Behavior of Al Alloy

Narducci¹,

N²,

AJ³

2021

annmaterialsscieng

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“…It has been reported by Xu et al that the presence of Si with a high content can react with Ti elements in the alloy to form Ti-Si, Ti-Al-Si and other intermetallic compounds either in the melt, which reduces the growth restriction factor caused by Ti, or on the surface of nucleation sites (i.e., TiB 2 or TiC), which results in the inactivation of TiB 2 or TiC particles for nucleation. The so-called ''Si poisoning'' phenomenon occurs [3], [16]. Moreover, with increasing Si content, the solidification onset temperature decreases and thus leads to an increase of superheat and intensifies the grain coarsening phenomenon at the constant pouring temperature, which is consistent with the variation of a-Al grain size with Si contents, as shown in Fig.…”

Section: Effects Of Si and Sr Elements On Solidification Microstructuresupporting

confidence: 75%

“…In terms of solidification microstructure of hypoeutectic Al-Si alloy, it is mainly composed of primary a-Al and eutectic Si. In order to refine the primary a-Al grain, grain refiners such as Al-5Ti-1B and Al-Nb-B have been very often used [2], [3], [4], while in order to modify the eutectic Si, Sr has been very often used [5], [6]. In terms of the thermal and electrical conductivity of hypoeutectic Al-Si alloy, elucidating effects of alloying elements on the thermal and electrical conductivity is of great importance.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Effects of Si and Sr elements on solidification microstructure and thermal conductivity of Al–Si-based alloys

et al. 2022

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Effects of Si and Sr on solidification microstructure and thermal conductivity of Al–Si binary alloys and Al–9Si–Sr ternary were investigated, respectively, with a special focus on the relationship between solidification microstructure and thermal conductivity. It was found that (i) in Al–Si binary alloys, with increasing Si content, α-Al grain size increases and then decreases when Si content is over 7 wt%, while the percentage of eutectic Si continuously increases, which significantly decreases the thermal conductivity and electrical conductivity, and (ii) in Al–9Si–Sr ternary alloys, the presence of Sr has no significant effect on α-Al grain, but effectively modifies eutectic Si and significantly improves the thermal and electrical conductivity. On this basis, two theoretical calculation models [the Maxwell model and the Hashin–Shtrikman (H–S) model] were used to elucidate the relationship between solidification microstructure and thermal conductivity. Compared with the Maxwell model, the H–S model fits better with the measured values. The obtained results are very helpful to the precise composition control during alloy design and recycling of Al–Si-based alloys with the aim to further improve the thermal conductivity of Al–Si-based alloys. Graphical abstract

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“…That is Nb>B; Nb=B and Nb<B and the form of its addition (i.e., Nb powder, Potassium tetrafluoroborate KBF4 flux or Al-Nb-B master alloy), they are variables that end up influencing the efficiency of grain refinement. In addition to these variables, one can also mention the manufacturing process, the processing parameters, and the nature of the raw materials used as essential factors to control efficiency in the refinement of grains 12,13 . To better understand this subject, made comparisons between the results of grain refinement taken from the available literature, where produced samples with parameters similar to those used in this work, as the inoculation via Nb-B with the same conditions of Nb addition content, but with B varying according to stoichiometric calculation (variations in the Nb-B ratio).…”

Section: Introductionmentioning

confidence: 99%

Effect of the Heterogeneous Nucleation of the Primary α-Al Grain Via the Al-4Nb-0.5B Master Alloy in Al-Si Alloys With High Fe Contents

2021

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Grain refinement in Al-Si alloys improves their mechanical properties. Research available in the literature shows the search for refinement efficiency through heterogeneous nucleation of the grain, involving the stoichiometric ratio between the alloy elements, the inoculant, and process parameters. In these surveys, there are divergences of information. However, this study does not aim to contradict this information but present an investigation made with the Al-4Nb-0.5B master alloy, where Nb >> B, used via sticks, with variations from 0 to 1 Wt.% of Nb and B according to a stoichiometric calculation added to the alloys cast with Al (7, 9, 12) Wt.% of Si and 1 Wt.% of Fe. The study also enabled an investigation into the morphology behavior of the β-Fe precipitates arising from Fe-critic in the alloy. Samples cast according to the TP1-2012 mold standard. The alloy microstructure analyzed was by energy-dispersive X-ray spectroscopy. The small addition of Nb-B can efficiently and significantly refine the size of the primary α-Al grain and has caused changes in the morphology of Fe-rich intermetallic, which became very refined spheroidised, suggesting an improvement in the mechanical properties of the material.

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Development of Al–Nb–B master alloy with high Nb/B ratio for grain refinement of hypoeutectic Al–Si cast alloys

Cited by 67 publications

References 48 publications

Recycling of the Al Scrap: The Effect of Adding Inoculant Nb+B and Mg with Subsequent Heat-Treatment in the Mechanical Behavior of Al Alloy

Recycling of the Al Scrap: The Effect of Adding Inoculant Nb+B and Mg with Subsequent Heat-Treatment in the Mechanical Behavior of Al Alloy

Effects of Si and Sr elements on solidification microstructure and thermal conductivity of Al–Si-based alloys

Effect of the Heterogeneous Nucleation of the Primary α-Al Grain Via the Al-4Nb-0.5B Master Alloy in Al-Si Alloys With High Fe Contents

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