Busca avançada
Ano de início
Entree


3D X-ray Tomography Analysis of Mg-Si-Zn Alloys for Biomedical Applications: Elucidating the Morphology of the MgZn Phase

Texto completo
Autor(es):
de Gouveia, Guilherme Lisboa ; Ganju, Eshan ; Moura, Danusa ; Morankar, Swapnil K. ; Spinelli, Jose Eduardo ; Chawla, Nikhilesh
Número total de Autores: 6
Tipo de documento: Artigo Científico
Fonte: APPLIED SCIENCES-BASEL; v. 14, n. 17, p. 20-pg., 2024-09-01.
Resumo

Temporary metal implants, made from materials like titanium (Ti) or stainless steel, can cause metabolic issues, raise toxicity levels within the body, and negatively impact the patient's long-term health. This necessitates a subsequent operation to extract these implants once the healing process is complete or when they are outgrown by the patient. In contrast, medical devices fabricated from absorbable alloys have the advantage of being biodegradable, allowing them to be naturally absorbed by the body once they have fulfilled their role in facilitating tissue healing. Among the various absorbable alloy systems studied, magnesium (Mg) alloys stand out due to their biocompatibility, mechanical properties, and corrosion behavior. The existing literature on absorbable Mg alloys highlights the effectiveness of silicon (Si) and zinc (Zn) additions in improving mechanical properties and controlling corrosion susceptibility; however, there is a lack of comprehensive quantitative morphological analysis of the intermetallic phases within these alloy systems. The quantification of the complex morphology of intermetallic particles is a challenging task and has significant implications for the micromechanical properties of the alloys. This study, therefore, aims to introduce a robust set of morphometric parameters for evaluating the morphology of intermetallic phases within two as-cast Mg alloys with Si and Zn additions. X-ray Computed Tomography (XCT) was used to capture the 3D tomographic data of the alloys, and a novel pair of morphological parameters (ratio of convex hull to particle volume and convex hull sphericity) was applied to the 3D tomographic data to assess the MgZn phase formed in the two alloys. In addition to the impact of composition, the effect of solidification rate on the morphological parameters was also studied. Furthermore, Scanning Electron Microscopy (SEM) and Energy-Dispersive Spectroscopy (EDS) were employed to gather detailed 2D microstructural and compositional information on the intermetallics. The comprehensive characterization reveals that the morphological complexity and size distribution of the MgZn phase are influenced by both compositional changes and the solidification rate. However, the change in MgZn intermetallic particle morphology with size was found to follow a predictable trend, which was relatively agnostic of the chosen casting conditions. (AU)

Processo FAPESP: 19/01432-8 - Desenvolvimento microestrutural, resistências mecânica e à corrosão de ligas Mg-Si e Mg-Si-(X) para aplicações biomédicas
Beneficiário:Guilherme Lisboa de Gouveia
Modalidade de apoio: Bolsas no Brasil - Doutorado
Processo FAPESP: 23/06107-3 - Estudo do crescimento de fases primárias AlFe em ligas de Al e de camadas intermetálicas em juntas Sn-Bi-X/cobre
Beneficiário:José Eduardo Spinelli
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 22/01895-0 - Avaliação da evolução microestrutural de ligas biomédicas absorvíveis a base de Mg durante processo de corrosão através da análise não-destrutiva usando técnica de microtomografia por raios-x
Beneficiário:Guilherme Lisboa de Gouveia
Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado