Investigation of microstructure, crystallographic texture, and mechanical behavior of magnesium-based nanocomposite fabricated via multi-pass FSP for biomedical applications
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In this article, the microstructure, crystallographic texture, hardness, and tensile behavior of AZ91/HA bio-nano composite manufactured by multi-pass friction stir processing (FSP) were investigated.Abstract:
In this work, the microstructure, crystallographic texture, hardness, and tensile behavior of AZ91/HA bio-nano composite manufactured by multi-pass friction stir processing (FSP) were investigated. With increasing the number of FSP passes, the average size of grains is reduced. The processed AZ91 and AZ91/HA nanocomposite after the third pass had the lowest grain size (4.5 and 2.6 μm, respectively). Also, the average grain size of composites was smaller than that of monolithic samples at the same pass number. The results showed that particle distribution in the AZ91/HA nanocomposite is significantly affected by the number of passes. The increment of the pass number led to a more uniform dispersion of HA nanoparticles in the matrix due to more plastic flow of materials. With increasing the pass number to three, the accumulated strain increased to 0.726 (monolithic) and 0.623 (composite) due to repeating mechanical stirring. There was a texture transition ( { 10 1 ‾ 1 } to { 0002 } ) via performing only one pass of FSP. Suppression of grain rotation by HA nanoparticles maintained the intensity of { 10 1 ‾ 1 } texture as a corrosion-resistant orientation after the third pass. With increasing the pass number of FSP, the hardness and strength of samples increased due to the grain size reduction and the more uniform dispersion of HA powder. The composite sample after the third pass exhibited the highest hardness of 117.0 HV and ultimate tensile strength of 306.6 MPa. The failure mode of processed samples was ductile. There were smaller dimples on the fracture surface of the composite samples due to their lower grain size and also the presence of HA nanoparticles. Considering the obtained results, the nanocomposite after the third pass can be a good load-bearing implant for biomedical applications.read more
Citations
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Fabrication of a biodegradable and cytocompatible magnesium/nanohydroxyapatite/fluorapatite composite by upward friction stir processing for biomedical applications.
Catarina Vidal,Patrícia Alves,Marta Alves,M.J. Carmezim,Maria Helena Fernandes,Liliana Grenho,Patrick L. Inácio,Francisco Ferreira,Telmo G. Santos,Catarina Santos +9 more
TL;DR: In this paper , a multi-pass upward friction stir processing (UFSP) was used to improve the bioactivity and cytocompatibility of Mg composites, and the results revealed that the presence of FA particles, together with HAP nanoparticles, were able to favor osteoblasts-biomaterial interaction.
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TL;DR: In this article , the effect of FSP parameters and types of reinforcement particles on the microstructure, mechanical properties, tribological and corrosion behaviors is discussed. And the suggestions and future development directions of FSTP as a surface modification technology are outlined.
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References
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