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Microstructure and properties of biomedical ZK60/hydroxyapatite composites prepared by friction stir processing
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DOI：10.1007/s42243-026-01885-2.png)
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Abstract
En 中文
To address the excessively rapid degradation issue of magnesium (Mg) alloys, ZK60/hydroxyapatite (HA) composites were fabricated via multi-pass friction stir processing (FSP). The effects of rotational speeds (1300, 1500, 1700 r/min) and FSP passes (1, 3, 5) on the microstructure and comprehensive performance of the composites were investigated through microstructure observation, mechanical property test, electrochemical measurements and antimicrobial assays. Microstructural analysis revealed that grain refinement and uniform HA dispersion are achieved due to the severe plastic deformation and dynamic recrystallization. S1500-3 composite (1500 r/min, 3 FSP passes) exhibits optimal comprehensive properties with the average grain size of 1.53 μm, ultimate tensile strength of 226.3 MPa and microhardness of 65.9 HV0.1. Micro-area electrochemical analysis indicates uniform current density distribution in Hank’s solution while polarization curves reveal a maximum corrosion potential of –1.3397 V, confirming the excellent corrosion resistance of S1500-3 composite. Antimicrobial assays demonstrated that S1500-3 composite exhibited an 87.27% antibacterial rate against Escherichia coli (E. coli) due to the uniformly dispersed HA particles. This work verifies that optimized multi-pass FSP enables ZK60/HA composites with integrated mechanical properties, corrosion resistance and antibacterial performance, laying a solid foundation for their application as bone implant materials.
Keywords:
ZK60/hydroxyapatite
Friction stir processing
Microstructure
Corrosion
Antibiosis
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