| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Biodegradable Materials for Medical Applications II
|
| Presentation Title |
High Strength Rare Earth Free Mg Alloys with Controlled Degradation Behavior Through Microstructural Manipulation |
| Author(s) |
Ehsan Mostaed, Malgorzata Sikora-Jasinska, Jaroslaw W. Drelich |
| On-Site Speaker (Planned) |
Ehsan Mostaed |
| Abstract Scope |
Magnesium (Mg) alloys have received increasing attention as potential bioresorbable medical materials for orthopedic load-bearing applications due to their excellent biocompatibility. Unfortunately, Mg rapid degradation in physiological environments, accompanied with a large amount of hydrogen gas release, affects tissue regeneration and delays the bone healing. Addition of rare earth elements (REEs) improves the degradation performance of Mg alloys. However, concerns about their biosafety have recently been raised. We have produced several REE-free nanostructured Mg alloys containing nutrient elements of Zn, Ca and Sr using a combination of novel non-equilibrium rapid solidification and severe plastic deformation (SPD) techniques. The SPD induced ultrafine-grained structure and dynamic precipitation of MgZn, Ca2Mg6Zn3 and Mg17Sr2 intermetallics resulted in remarkable enhancement of the alloys strength. Moreover, owing to the uniformly distributed nanosized precipitates within the Mg matrix, nanostructured alloys exhibited nearly an order of magnitude lower corrosion rate than their conventionally processed counterparts. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |