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<p>Interstitial oxygen (O) contamination remains a substantial challenge for metal injection molding (MIM) of titanium alloys. Herein, this critical problem is successfully addressed by regulating the thermal debinding temperature and incorporating the oxygen scavenger LaB<sub>6</sub>. Results indicate that the surface oxide layer (with a thickness of (13.4 ± 0.5) nm) of Ti6Al4V powder begins to dissolve into the Ti matrix within the temperature range of 663–775°C. O contamination in MIM Ti alloys can be effectively mitigated by lowering the thermal debinding temperature and adding LaB<sub>6</sub> powder. As a result of reduced dissolved O content, the slips of mixed &lt;<i>a</i>&gt; and &lt;<i>c</i> + <i>a</i>&gt; dislocations are effectively accelerated, leading to improved ductility. Moreover, grain refinement, along with the <i>in situ</i> formation of TiB whiskers and second-phase La<sub>2</sub>O<sub>3</sub> particles, enhances the strength of the material. The fabricated MIM Ti6Al4V sample exhibits excellent mechanical properties, achieving an ultimate tensile strength of (967 ± 5) MPa, a yield strength of (866 ± 8) MPa, and an elongation of 21.4% ± 0.7%. These tensile properties represent some of the best results reported in the literature for MIM Ti6Al4V alloys. This study offers valuable insights into the development of high-performance MIM Ti alloys and other metal materials.</p>

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Strength–ductility synergy strategy of Ti6Al4V alloy fabricated by metal injection molding

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Jianzhuo Sun,
  • Yu Pan,
  • Yanjun Liu,
  • Fan Kuang,
  • Ranpeng Lu,
  • Xin Lu

摘要

Interstitial oxygen (O) contamination remains a substantial challenge for metal injection molding (MIM) of titanium alloys. Herein, this critical problem is successfully addressed by regulating the thermal debinding temperature and incorporating the oxygen scavenger LaB6. Results indicate that the surface oxide layer (with a thickness of (13.4 ± 0.5) nm) of Ti6Al4V powder begins to dissolve into the Ti matrix within the temperature range of 663–775°C. O contamination in MIM Ti alloys can be effectively mitigated by lowering the thermal debinding temperature and adding LaB6 powder. As a result of reduced dissolved O content, the slips of mixed <a> and <c + a> dislocations are effectively accelerated, leading to improved ductility. Moreover, grain refinement, along with the in situ formation of TiB whiskers and second-phase La2O3 particles, enhances the strength of the material. The fabricated MIM Ti6Al4V sample exhibits excellent mechanical properties, achieving an ultimate tensile strength of (967 ± 5) MPa, a yield strength of (866 ± 8) MPa, and an elongation of 21.4% ± 0.7%. These tensile properties represent some of the best results reported in the literature for MIM Ti6Al4V alloys. This study offers valuable insights into the development of high-performance MIM Ti alloys and other metal materials.