Hardness Changes Due to the Morphological Evolution of Microstructural Phases in an As-Solidified Zn-Fe Alloy

Autor(es)

de Sousa, Guilherme Calixto Carneiro ; de Paula, Andrei ; Barros, Andre ; Garcia, Amauri ; Cheung, Noe

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS; v. 18, n. 6, p. 15-pg., 2025-03-16.

Resumo

Zn-Fe alloys are gaining attention for their use as bioabsorbable implants, and their development requires a deeper understanding of the processing-microstructure-property relationships. This study aimed to analyze the influence of microstructural features on the hardness of a Zn-2 wt.%Fe alloy. To achieve this, a casting was fabricated using directional solidification, and samples that experienced various cooling conditions were extracted from it. The results show that the microstructure of the investigated alloy was composed of a Zn-rich phase (matrix) and FeZn13 intermetallic particles. Four different morphological patterns of the microstructure could be formed, depending on the thermal conditions during solidification. For each of these patterns, a reduction in the spacing between FeZn13 particles, a parameter representing the degree of microstructural refinement, did not lead to a considerable increase in the hardness of the Zn-2wt.%Fe alloy. Hardness was shown to be more dependent on the morphology of the FeZn13 intermetallics and Zn-rich matrix than on the degree of refinement of these microstructural phases. Therefore, the present research provides valuable insights into the development of enhanced Zn-Fe alloys by demonstrating how microstructural features can affect their properties, particularly in terms of hardness and morphologies of the microstructural phases. (AU)

• Processo FAPESP: 21/11439-0 - Inter-relações entre parâmetros térmicos/microestruturas de solidificação com resistência ao desgaste e geração de hidrogênio de ligas Al-Sn-(Mg;Zn)
• Beneficiário: Noe Cheung
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 23/01422-8 - Geração de hidrogênio a partir de ligas Al-Mg-Fe-Sn: uma estratégia de reciclagem com ênfase na microestrutura
• Beneficiário: Noe Cheung
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 23/12535-8 - Geração de Hidrogênio a partir de Ligas Al-Mg-Fe-Sn: Uma Estratégia de Reciclagem com Ênfase na Microestrutura
• Beneficiário: Andre dos Santos Barros
• Modalidade de apoio: Bolsas no Brasil - Programa Fixação de Jovens Doutores