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<p>Compared to conventional thermomechanical processing, additive manufacturing offers the advantage of producing a strong &lt;100&gt; texture in β-Ti alloys for a low elastic modulus. Further reducing the elastic modulus of these additively manufactured alloys to values closer to that of bone tissue would be beneficial for practical applications. In this work, a β-type Ti-24Nb-4Zr-8Sn alloy was fabricated via electron beam melting to investigate its microstructure and mechanical properties. The results indicate that samples built vertically relative to the build orientation can achieve a dynamic elastic modulus of 39.5&#xa0;GPa, which is about 15&#xa0;GPa lower than those of the most additively manufactured titanium alloys. This is coupled with a high strength-to-modulus ratio of 1.7% and an elongation exceeding 30%. These favorable properties are attributed to a strong &lt;100&gt; texture of the β-phase matrix combined with an electron-to-atom ratio of 4.15, which is close to the elastic stability limit of the body-centered cubic crystal. Aided by its orientation-dependent elastic moduli of single crystals, a model was established to evaluate the elastic anisotropy of the as-manufactured samples and to get a method to further reduce the elastic modulus. These results would be helpful for additively manufactured titanium alloys to further reduce elastic modulus and improve biomechanical compatibility.</p> Graphical abstract <p></p>

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A highly-textured biomedical titanium alloy with a low elastic modulus

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Chengqian Lu,
  • Qiushuang Wang,
  • Delun Gong,
  • Yanxu Wang,
  • L. S. R. Kumara,
  • Yuxiang Zhang,
  • Kaiyue Chen,
  • Zengqian Liu,
  • Rui Yang,
  • Yulin Hao

摘要

Compared to conventional thermomechanical processing, additive manufacturing offers the advantage of producing a strong <100> texture in β-Ti alloys for a low elastic modulus. Further reducing the elastic modulus of these additively manufactured alloys to values closer to that of bone tissue would be beneficial for practical applications. In this work, a β-type Ti-24Nb-4Zr-8Sn alloy was fabricated via electron beam melting to investigate its microstructure and mechanical properties. The results indicate that samples built vertically relative to the build orientation can achieve a dynamic elastic modulus of 39.5 GPa, which is about 15 GPa lower than those of the most additively manufactured titanium alloys. This is coupled with a high strength-to-modulus ratio of 1.7% and an elongation exceeding 30%. These favorable properties are attributed to a strong <100> texture of the β-phase matrix combined with an electron-to-atom ratio of 4.15, which is close to the elastic stability limit of the body-centered cubic crystal. Aided by its orientation-dependent elastic moduli of single crystals, a model was established to evaluate the elastic anisotropy of the as-manufactured samples and to get a method to further reduce the elastic modulus. These results would be helpful for additively manufactured titanium alloys to further reduce elastic modulus and improve biomechanical compatibility.

Graphical abstract