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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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Mueller, Maik
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024Creep characterization of lead-free solder alloys over an extended temperature range used for fatigue modeling
- 2023Temperature-dependent Creep Characterization of Lead-free Solder Alloys Using Nanoindentation for Finite Element Modelingcitations
- 2022Corrosion study on Cu/Sn-Ag solid-liquid interdiffusion microbumps by salt spray testing with 5 wt.% NaCl solutioncitations
- 2020Grain Structure Analysis of Cu/SiO2 Hybrid Bond Interconnects after Reliability Testingcitations
- 2020Morphologies of Primary Cu6Sn5 and Ag3Sn Intermetallics in Sn–Ag–Cu Solder Ballscitations
- 2018Morphology Variations of Primary Cu6Sn5 Intermetallics in Lead-Free Solder Ballscitations
- 2018Characterization of low temperature Cu/In bonding for fine-pitch interconnects in three-dimensional integrationcitations
- 2013Microstructure investigation of Cu/SnAg solid-liquid interdiffusion interconnects by Electron Backscatter Diffractioncitations
- 2012Effects of bonding pressure on quality of SLID interconnectscitations
- 2011Solidification processes in the Sn-rich part of the SnCu systemcitations
- 2010Microstructure Characterization Of Lead‐Free Solders Depending On Alloy Compositioncitations
- 2010Metallographic preparation of the SnAgCu solders for optical microscopy and EBSD Investigationscitations
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document
Solidification processes in the Sn-rich part of the SnCu system
Abstract
In this study SnCu solder spheres (Ø 270 μm, CR ~ 1 K/s) were investigated in order to verify the solidified microstructure according to the Sn-rich part of the SnCu phase diagram. The investigated alloys are Sn99.9, SnCu0.25, SnCu0.5, SnCu0.7, SnCu0.9, SnCu1.2, SnCu1.5, and SnCu3.0. In order to understand the solidification process, such aspects as morphology, grain structure and undercooling were analysed. The microstructure was investigated by optical microscopy, SEM and EDX. The undercooling was measured by DSC. It will be shown that small SnCu solder spheres solidify not only with commonly known β-Sn dendrites and fine Cu6Sn5 IMCs in the interdendritic spacing, but with specific and systematic changes in morphology, which depend on composition. The successive morphology transitions were found: from 1) fine Cu6Sn5 IMCs in β-Sn to 2) small β-Sn cells to 3) β-Sn cellular/dendritic to 4) fine Cu6Sn5 IMCs in β-Sn or undirected β-Sn cells. The area fraction of these different morphologies and the number of grain orientations were estimated from the cross-sections of about 20 solder spheres per composition. This allows a quantitative description of the microstructure and its compositional dependency. The results also show that the formation of large Cu6Sn5 IMCs provokes more grain orientations compared to SnCu solders solidified without large intermetallic phases.