| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Solid-State Diffusion Bonding of Metals and Alloys
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| Presentation Title |
Analysis of Kirkendall voids formation in Ni(W) diffusion-induced recrystallization region |
| Author(s) |
Minho Oh, Hee-Soo Kim, Equo Kobayashi, Masanori Kajihara |
| On-Site Speaker (Planned) |
Minho Oh |
| Abstract Scope |
This study elucidates the formation of intermetallic compounds (IMCs) and the evolution of Kirkendall voids. The formation of polycrystalline IMC layers and diffusion-induced recrystallization (DIR) regions were observed by various experimental methods and quantified through an extended numerical model. Experiments revealed polycrystalline layers with Ni4W and a distinct DIR region, with irregularly shaped Kirkendall voids in the DIR region of the Ni matrix. The DIR region thickness exceeding W penetration depth indicated rapid alloying. Quantification of Kirkendall voids through Blob analysis linked numerical results to experiments, highlighting the dependence of vacancy fraction and region evolution on W diffusivity and grain boundary diffusion. Temporal evolution showed no vacancies near Ni4W/DIR, with the leading edge at DIR/Ni, providing insights into annealing-induced vacancy distribution. This integrated approach advances the understanding of thermodynamics and kinetics in the Ni-W diffusion couple, which is crucial for high-temperature materials science applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Joining, |