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<p>This study investigates the effects of high-pressure torsion (HPT) on the mechanical properties, corrosion resistance, and biocompatibility of the Ti-33Nb-4Sn (wt.%) alloy. Additionally, it examines how the severe plastic deformation of the substrate influences the formation of nanostructured anodic films on its surface. The alloy was prepared using arc melting, followed by HPT processing under 6 GPa of pressure, with varying revolutions (<i>N</i> = 1/4, 1, 5, 16). Microstructural analysis using x-ray diffraction (XRD) and scanning electron microscopy revealed significant grain refinement and stabilization of the β phase. Mechanical testing demonstrated a substantial increase in microhardness and nanohardness, with peak values reaching 270 HV, as well as a decrease in elastic modulus. Biocompatibility assessments, conducted using the MTT assay, showed increased cell viability with higher HPT revolutions, particularly pronounced in the <i>N</i> = 16 condition. Surface modification through anodization resulted in the formation of a uniform nanotube layer; however, extensive HPT processing reduced layer thickness. Corrosion tests indicated a slight decrease in corrosion resistance with increased HPT revolutions, likely due to grain size reduction and increased dislocation density. Overall, HPT processing significantly enhances the mechanical properties and biocompatibility of the Ti-33Nb-4Sn alloy, underscoring its potential for advanced biomedical applications.</p>

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Effects of High-Pressure Torsion on Mechanical Properties, Biocompatibility, and Corrosion Resistance of Ti-33Nb-4Sn Alloy

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Ricardo Floriano,
  • Kaveh Edalati,
  • Rodrigo Contieri,
  • Augusto Ducatti Luchessi,
  • Alessandra Cremasco

摘要

This study investigates the effects of high-pressure torsion (HPT) on the mechanical properties, corrosion resistance, and biocompatibility of the Ti-33Nb-4Sn (wt.%) alloy. Additionally, it examines how the severe plastic deformation of the substrate influences the formation of nanostructured anodic films on its surface. The alloy was prepared using arc melting, followed by HPT processing under 6 GPa of pressure, with varying revolutions (N = 1/4, 1, 5, 16). Microstructural analysis using x-ray diffraction (XRD) and scanning electron microscopy revealed significant grain refinement and stabilization of the β phase. Mechanical testing demonstrated a substantial increase in microhardness and nanohardness, with peak values reaching 270 HV, as well as a decrease in elastic modulus. Biocompatibility assessments, conducted using the MTT assay, showed increased cell viability with higher HPT revolutions, particularly pronounced in the N = 16 condition. Surface modification through anodization resulted in the formation of a uniform nanotube layer; however, extensive HPT processing reduced layer thickness. Corrosion tests indicated a slight decrease in corrosion resistance with increased HPT revolutions, likely due to grain size reduction and increased dislocation density. Overall, HPT processing significantly enhances the mechanical properties and biocompatibility of the Ti-33Nb-4Sn alloy, underscoring its potential for advanced biomedical applications.