Microstructural and Mechanical Characterisation of Ti-CoCuFeNbMo HEA Composite Coating Deposited by Cold Spray for Biomedical Applications

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Research Scholar J SHARATH KUMAR, jsk.ip.21@nitj.ac.in; Assistant Professor Rajeev Verma, vermar@nitj.ac.in; Associate Professor Rakesh Kumar, sharmark@nitj.ac.in; 

https://doi.org/10.53192/ITSC2026593

High-entropy alloys (HEAs) represent a novel alloy design strategy that involves the combination of multiple principal elements in equimolar or near-equimolar ratios, resulting in multi-component solid solutions with exceptional mechanical properties. In this study, a titanium-based composite HEA (CoCuFeNbMo) coating was developed for biomedical applications using the high-pressure cold spray method. Two compositions, Ti with 30% HEA and Ti with 50% HEA, were deposited on SS 316L substrates. The coatings exhibited nanostructured grain morphology with a stable phase and no signs of delamination or cracking. Microhardness testing revealed a substantial increase in hardness for both coated samples compared to the uncoated SS 316L. Contact angle measurements demonstrated enhanced hydrophilicity in both coatings, indicating improved surface wettability. Adhesion strength was evaluated by altering the substrate surface condition, specifically comparing mirror-polished and laser-textured surfaces. Field emission scanning electron microscopy (FE-SEM) analysis was used to study the microstructure and porosity of the coatings. Notably, the Ti-50% HEA coating displayed a higher degree of porosity, a desirable feature for biomedical applications due to its potential to support better osseointegration and cell attachment.

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March 2026

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