Ti6Al4V Bone Implants: Effect of Laser Shock Peening on Physical, Mechanical, and Biological Properties
Source abstract
Abstract
Titanium alloy Ti6Al4V is widely used in the production of bone implants due to its favorable mechanical properties and biocompatibility. However, implant failures still occur due to lack of osseointegration, tissue infection, and fatigue. Laser shock peening (LSP) is a surface treatment method that can improve the physical, mechanical, and biological properties of Ti6Al4V implants. This method enhances the fatigue life of implants by inducing compressive residual stress on their surface region. In this study, Ti6Al4V samples were subjected to LSP treatment using different laser power densities (9.6 and 14.9 ({{{ ext{GW}}} mathord{left/ {vphantom {{{ ext{GW}}} {{ ext{cm}}2 }}} ight. kern-0pt} {{ ext{cm}}2 }})) and with (vinyl tape and commercial black color) and without a protective layer. LSP-treated samples with higher power density exhibited maximum compressive residual stresses. Furthermore, hydrophobicity increased in all samples with increasing laser power density. Notably, the surface roughness results demonstrated significant improvement where the roughness increased with increasing the laser power density. The sample without a protective layer exhibited the highest surface roughness, followed by the black color coated and vinyl tape surface protected samples. The residual stress, surface roughness, and hydrophilicity of the samples were evaluated to determine the optimal LSP parameters. Fatigue tests revealed a remarkable enhancement in the fatigue life of the LSPed samples compared to untreated samples (3 and 2.9 times longer life for black-color coated and without coating samples, respectively). Moreover, the microstructure of laser peening samples and the fracture surface of the fatigue samples were characterized using field emission scanning electron microscopy (FE-SEM). To evaluate the biological characteristics of the optimal LSP-treated samples, a hydroxyapatite coating was applied, and their biological characteristics, including cell viability and adhesion, were investigated. Furthermore, the combination of LSP with hydroxyapatite coating offers a potential solution to promote osseointegration and reduce implant failures.
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Research context
OpenAlex topics: Surface Treatment and Residual Stress · Bone Tissue Engineering Materials · Diamond and Carbon-based Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (55)
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