Influence of Al-5.0Nb-0.5B inoculant on the microstructure and mechanical properties of AA 2017 alloy fabricated using laser-based powder bed fusion

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Bomfim, Pamela Karina dos Santos ; Batistao, Bruna Fernanda ; de Araujo, Aylanna Priscila Marques ; Pereira, Leandro Henrique ; Buzolin, Ricardo Henrique ; Amancio-Filho, Sergio T. ; Afonso, Conrado Ramos Moreira ; Bolfarini, Claudemiro ; Kiminami, Claudio Shyinti ; Coury, Francisco Gil ; Gargarella, Piter

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 1032, p. 14-pg., 2025-06-10.

Resumo

This study investigated the influence of the inoculant Al-5.0Nb-0.5B on the microstructure and mechanical properties of the AA 2017 alloy fabricated using laser-based powder bed fusion (L-PBF). The AA 2017 alloy powder was obtained through gas atomization and then mixed with 2 wt% of Al-5.0Nb-0.5B powder (20-53 mu m) and synthesized using the L-PBF technique. The small addition of the Al-5.0Nb-0.5B, coupled with specific processing parameters, led to a reduction in the fraction of cracks and transformed the solidification structure from cellular to equiaxial. Additionally, it resulted in a grain size reduction down to 4.0 f 2.9 mu m and a low fiber texture. Due to the refined grains, the AA 2017 samples with 2 wt% Al-5.0Nb-0.5B exhibited a high yield strength of 215 f 33 MPa and ultimate compressive strength of 602 f 47 MPa, compared to the AA 2017 alloy samples, which exhibited yield strength of 171 f 8 MPa and ultimate compressive strength of 427 f 46 MPa. The addition of a small fraction of Al-5.0Nb-0.5B to the AA 2017 alloy, produced by L-PBF, is a promising alternative for manufacturing lightweight parts with a lower amount of hot cracks and equiaxial microstructure. The results show that the use of inoculant with the micrometric size is an effective alternative to the use of nanoparticles, which has a higher safety risk, is usually difficult to homogenize and may promote agglomeration. (AU)

• Processo FAPESP: 20/09544-7 - Funcionalização da superfície do pó da liga de alumínio AA2017 para uso em Manufatura Aditiva
• Beneficiário: Bruna Fernanda Batistão
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/27031-4 - Influência de parâmetros de processo nas características metalúrgicas de peças fabricadas por manufatura aditiva
• Beneficiário: Piter Gargarella
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 20/07692-9 - Fabricação e caracterização de compósitos de matriz metálica vítrea a base de Fe produzidos por manufatura aditiva
• Beneficiário: Aylanna Priscila Marques de Araújo
• Modalidade de apoio: Bolsas no Brasil - Doutorado