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Magnesium-Based Bioactive Composites Processed at Room Temperature

2019; Multidisciplinary Digital Publishing Institute; Volume: 12; Issue: 16 Linguagem: Inglês

10.3390/ma12162609

1996-1944

Moara M. Castro, Débora R. Lopes, Renata Braga Soares, Diogo M.M. dos Santos, Eduardo H.M. Nunes, Vanessa de Freitas Cunha Lins, Pedro Henrique R. Pereira, Augusta Isaac, Terence G. Langdon, Roberto B. Figueiredo,

Aluminum Alloys Composites Properties

Hydroxyapatite and bioactive glass particles were added to pure magnesium and an AZ91 magnesium alloy and then consolidated into disc-shaped samples at room temperature using high-pressure torsion (HPT). The bioactive particles appeared well-dispersed in the metal matrix after multiple turns of HPT. Full consolidation was attained using pure magnesium, but the center of the AZ91 disc failed to fully consolidate even after 50 turns. The magnesium-hydroxyapatite composite displayed an ultimate tensile strength above 150 MPa, high cell viability, and a decreasing rate of corrosion during immersion in Hank's solution. The composites produced with bioactive glass particles exhibited the formation of calcium phosphate after 2 h of immersion in Hank's solution and there was rapid corrosion in these materials.