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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Li, Jiehua
Montanuniversität Leoben
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2024Semi-analytical and experimental heat input study of additively manufactured Zr-based bulk metallic glasscitations
- 2024Investigation on the Duration of Action of Mg3N2 as a Grain Refiner for AZ80 Alloycitations
- 2023Effect of Ca and P on the Size and Morphology of Eutectic Mg2Si in High-Purity Al-Mg-Si Alloyscitations
- 2023Revealing effects of solute Ta on solidification and precipitation of Al-7Si-0.3Mg based alloyscitations
- 2023Effect of Mn addition on microstructure, mechanical properties and die soldering of rheocasting Al-7Si-0.3Mg alloys
- 2023Effect of Eu and P additions with Ta grain refiner on the solidification microstructure of Al-7Si-0.3Mg alloyscitations
- 2023Silicon Poisoning and Effects of Tantalum on AlSi Alloyscitations
- 2023A Comparison of Microstructure and Casting Defects of Rheocasting and Thixocasting Al-Si-Mg Alloy
- 2022Using Recycled Materials for Semi-Solid Processing of Al-Si-Mg Based Alloys
- 2022Effect of Solute Ta on Grain Refinement of Al-7Si-0.3Mg Based Alloyscitations
- 2022Elucidation of formation and transformation mechanisms of Ca-rich Laves phase in Mg-Al-Ca-Mn alloyscitations
- 2021The nucleation sequence of α-Al on TiB2 particles in Al-Cu alloyscitations
- 2021Einfluss von Tantal auf die Kornfeinung einer Al10SiMg Legierung
- 2019Eutectic modification by ternary compound cluster formation in Al-Si alloyscitations
- 2019Precipitation microstructure in Al-Si-Mg-Mn alloy with Zr additionscitations
- 2017Phase Decomposition of a Single-Phase AlTiVNb High-Entropy Alloy after Severe Plastic Deformation and Annealingcitations
- 2017The enhanced theta-prime (θ′) precipitation in an Al-Cu alloy with trace Au additionscitations
- 2016Revealing heterogeneous nucleation of primary Si and eutectic Si by AlP in hypereutectic Al-Si alloyscitations
- 2014Influence of dendritic morphology on the calculation of macrosegregation in steel ingotcitations
Places of action
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article
The nucleation sequence of α-Al on TiB2 particles in Al-Cu alloys
Abstract
<p>The refinement of Al alloys by TiB<sub>2</sub> has been extensively investigated for decades, both in industry and academia. In order to achieve higher grain refinement potency, it is known that other solutes must be added alongside TiB<sub>2</sub>, thus tailoring the heterogeneous nucleation at the interface between the TiB<sub>2</sub> particles and the Al matrix. Here, we report results from an atomic-scale experimental investigation of the heterogeneous nucleation interface of TiB<sub>2</sub> in Al-Cu based alloys as well as in an Al-5Ti-1B grain refiner employed in these Al-Cu based alloys. We focus on the effect of segregation of the main solute elements (Ti, Cu) to the interface of TiB<sub>2</sub> and attempt to disentangle this effect from other factors affecting the nucleation and growth. Significant Ti segregation in the form of a Ti-rich layer, identified as an Al<sub>3</sub>Ti two-dimensional compound, was unambiguously observed on the basal plane of TiB<sub>2</sub> particles in the Al-5Ti-1B grain refiner, in agreement with prior literature. In the Al-Cu alloy system, prevalent Ti segregation was also observed on the basal plane of TiB<sub>2</sub>, accompanied in cases when the Cu concentration is high by the presence of a further atomic-scale Cu-rich layer. Based on these observations, a possible nucleation sequence for the Al-Cu based alloys with the addition of Al-5Ti-1B grain refiner is proposed whereby Al nucleation occurs on an Ti-rich layer on the surface of TiB<sub>2</sub>, which can then be preserved from a subsequent peritectic transformation by a surrounding eutectic reaction that forms a Cu-rich layer when sufficient Cu is present. This proposed nucleation sequence should help to link the absence or presence of Al<sub>3</sub>Ti layers on the basal plane of TiB<sub>2</sub> to processing conditions in post-solidification studies. Although it is difficult to know with absolute certainty if a TiB<sub>2</sub> particle observed in the post-solidification microstructure was active or inactive for heterogeneous nucleation during the solidification process, this experimental study highlights the possible role of Cu segregation on grain refinement of Al-Cu alloys by the Al-5Ti-1B grain refiner.</p>