| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2025
|
| Presentation Title |
A new approach to fabricate pore-free high-purity magnesium ingots |
| Author(s) |
Rui Zheng, Bo Yang, Wei-Chao Li, Zhen-Hui Qiang, Bo-yu Liu, Zhi-wei Shan |
| On-Site Speaker (Planned) |
Rui Zheng |
| Abstract Scope |
High-purity magnesium is highly promising for medical implants due to its excellent biocompatibility, bio-functionality, and appropriate degradability. However, traditional casting methods result in low-density ingots with uneven pore sizes and non-uniform pore spatial distribution, which cannot be completely eliminated by the subsequent extrusion process, compromising implant performance and lifespan. Here we propose a novel dense-casting method based on layer-by-layer solidification in unidirectional heat dissipation. This approach changes traditional multidirectional solidification to unidirectional, reducing the generation of shrinkage holes. Additionally, thin-layer melts facilitate bubble escape, and will control the composition segregation and microstructure differences within the thin-layer range. Our method significantly enhances the compactness of high-purity magnesium ingots, with no defects detected by standard ultrasonic inspection within the detection range, surpassing the AAA standard grade. Trace element(μg/g) homogeneity meets standard-sample requirements. This method is expected to provide high-quality raw materials for biodegradable magnesium implants, accelerating their entry into the medical market. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Solidification, Additive Manufacturing |