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<p>Development of biomedical titanium alloys with reduced elastic modulus remains a critical challenge for preventing stress shielding in orthopedic implants. While conventional Ti6Al4V exhibits a high elastic modulus (~ 110–120 GPa) and contains potentially toxic elements, β-type Ti-Ta alloys show promise due to their lower modulus and excellent biocompatibility. This study establishes comprehensive process-structure–property relationships for selective laser melting (SLM) of pre-alloyed Ti-15Ta powder, investigating how processing parameters control microstructural evolution and mechanical properties for biomedical applications. The effects of laser power (250–280 W), scanning speed (500–1000&#xa0;mm/s), and hatch spacing (80–100&#xa0;μm) were systematically examined. The optimal processing window was identified at energy densities between 60 and 80&#xa0;J/mm<sup>3</sup>, achieving relative densities above 99.7%. The microstructural analysis revealed that hatch spacing significantly affects phase composition, with 100-μm spacing promoting predominantly β-phase formation, while 80-μm spacing leads to mixed β + α″ structure. Both processing regimes demonstrated excellent mechanical properties, with ultimate tensile strength ~ 540&#xa0;MPa, elongation exceeding 20%, and relatively low Young’s modulus (~ 90 GPa). Post-processing heat treatment at 950&#xa0;°C resulted in the formation of equilibrium α + β structure with slightly reduced strength (523&#xa0;MPa) but maintained ductility (~ 19%). The study establishes process-structure–property relationships for SLM-manufactured Ti-15Ta alloy and demonstrates its potential for biomedical applications, particularly orthopedic implants requiring low elastic modulus and high ductility.</p>

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Process-structure–property relationships in selective laser melting of Ti-15Ta alloy for biomedical applications

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Igor Polozov,
  • Victoria Nefyodov,
  • Anton Zolotarev,
  • Victoria Sokolova,
  • Anna Gracheva,
  • Anatoly Popovich

摘要

Development of biomedical titanium alloys with reduced elastic modulus remains a critical challenge for preventing stress shielding in orthopedic implants. While conventional Ti6Al4V exhibits a high elastic modulus (~ 110–120 GPa) and contains potentially toxic elements, β-type Ti-Ta alloys show promise due to their lower modulus and excellent biocompatibility. This study establishes comprehensive process-structure–property relationships for selective laser melting (SLM) of pre-alloyed Ti-15Ta powder, investigating how processing parameters control microstructural evolution and mechanical properties for biomedical applications. The effects of laser power (250–280 W), scanning speed (500–1000 mm/s), and hatch spacing (80–100 μm) were systematically examined. The optimal processing window was identified at energy densities between 60 and 80 J/mm3, achieving relative densities above 99.7%. The microstructural analysis revealed that hatch spacing significantly affects phase composition, with 100-μm spacing promoting predominantly β-phase formation, while 80-μm spacing leads to mixed β + α″ structure. Both processing regimes demonstrated excellent mechanical properties, with ultimate tensile strength ~ 540 MPa, elongation exceeding 20%, and relatively low Young’s modulus (~ 90 GPa). Post-processing heat treatment at 950 °C resulted in the formation of equilibrium α + β structure with slightly reduced strength (523 MPa) but maintained ductility (~ 19%). The study establishes process-structure–property relationships for SLM-manufactured Ti-15Ta alloy and demonstrates its potential for biomedical applications, particularly orthopedic implants requiring low elastic modulus and high ductility.