About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Frontiers in Solidification: An MPMD Symposium Honoring Jonathan A. Dantzig
|
Presentation Title |
N-13: Fundamental Study on Nanoparticles Enhance Fluidity of Aluminum Alloys |
Author(s) |
Guan-Cheng Chen, Xiaochun Li |
On-Site Speaker (Planned) |
Guan-Cheng Chen |
Abstract Scope |
Fluidity is crucial for high-pressure die casting. It is well-known nanoparticles (NPs) can refine grain sizes and eliminate hot cracking during solidification processing. However, nanoparticles are traditionally considered to harm fluidity due to viscosity enhancement. Little research focuses on the effect of nanoparticles on fluidity. This paper presents a fundamental study on nanoparticle effects on the fluidity of AA2024 and AA6063 by vacuum fluidity tests. We discovered that dispersed TiC nanoparticles of 0.5, 1.0, and 2.0 vol% surprisingly enhance fluidity length by 10-20% without hot-cracking. Characterization study reveals that α-Al grains push NPs to boundaries during solidification. Higher nanoparticle concentration in the liquid phase delays the latent heat release, allowing the melt to flow further. Image analysis shows that melts flow faster initially with a better wetting angle and surface finish. This novel study suggests that nanoparticles can effectively enhance the die castability of difficult-to-cast aluminum alloys for widespread applications. |
Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Nanotechnology, Solidification |