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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
Silicon Poisoning and Effects of Tantalum on AlSi Alloys
Abstract
Grain refinement in Al-Si alloys is crucial for enhancing material castability and mechanical properties. Industrial practice involves adding inoculants, composed of TiB2 particles coated with metastable Al3Ti via adsorption, to the melt. This introduces essential free titanium for metastable phase formation and subsequent growth restriction. The superstoichiometric grain refiner Al-5Ti-1B, with 2.2 wt.% free titanium, is applied for this purpose. A peritectic reaction forms α-aluminium from this layer. However, when silicon content exceeds 3.5 wt.%, grain coarsening occurs due to silicon’s detrimental effect. This study quantified silicon poisoning in an Al-10Si alloy using stoichiometric and superstoichiometric grain refiners through ASTM-standardized TP1 tests. Adding 0.02 wt.% tantalum acted as an antidote to the τ1 phase, resulting in a finer microstructure. This was attributed to the formation of a Ta-rich layer on TiB2 particles, which causes α-aluminium formation via a peritectic reaction without generating ternary phases with Ti or Si. Correlating to the increasing particle size curves from the TP1 tests, phases were collected in the filter cake with the help of a PoDFA apparatus. These could be examined more closely on the SEM and identified as needle- or plate-shaped. By using an EDS unit, the phases found were assigned to the poisoning phase and further investigated. After the addition of tantalum, a solubility of tantalum could be detected in former poisoning phases. In combination with the gradients of the grain size, it can thus be assumed that tantalum is both an antidote for silicon poisoning in the Al-Si-Ti system and can itself have a grain-refining effect in this system.