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<p>Ta-10W alloy serves as a critical ultra-high-temperature structural material, while its insufficient room-temperature strength severely limits engineering applications. Herein, we propose a synergistic Nb and C co-doping strategy to strengthen Ta-10W alloy via combined Nb substitutional alloying and C interstitial solid solution strengthening. Strengthening mechanism was investigated via first-principles calculations combined with experimental validation. Nb alloying increased the shear modulus and Young’s modulus via promoting the formation of covalent bonds in the doped alloys, and therefore enhanced the yield strength and hardness, while excessive Nb content resulted in a decline in strength. Furthermore, the introduction of C into the Nb-doped alloy induced interstitial solid solution strengthening, this facilitates the formation of ionic bonds within the alloy, thereby enhancing its mechanical properties. The corresponding alloys were fabricated and subjected to hardness and mechanical tests to confirm the computational prediction. Notably, Ta-10.59W-5.36Nb-0.69C alloy exhibited yield strength 1119&#xa0;MPa and hardness 399.5 HV, representing an increase of 90 and 60% compared with the undoped Ta-10W alloy. Generally, Nb and C co-doping significantly enhanced the room-temperature mechanical performance of Ta-10W alloy through synergistic substitutional and interstitial solid solution strengthening, providing new ideas for the design of Ta-W alloys.</p>

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Synergistic Nb substitutional alloying and C interstitial solid solution strengthening of Ta-10W alloys: first-principles calculation and experimental perspective

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Yuchao Lin,
  • Yonggang Tong,
  • Yongle Hu,
  • Pengfei Wu,
  • Xiubing Liang,
  • Jingzhong Fang,
  • Hao Lan,
  • Mingjun Zhang,
  • Xixi Ji,
  • Kaiming Wang

摘要

Ta-10W alloy serves as a critical ultra-high-temperature structural material, while its insufficient room-temperature strength severely limits engineering applications. Herein, we propose a synergistic Nb and C co-doping strategy to strengthen Ta-10W alloy via combined Nb substitutional alloying and C interstitial solid solution strengthening. Strengthening mechanism was investigated via first-principles calculations combined with experimental validation. Nb alloying increased the shear modulus and Young’s modulus via promoting the formation of covalent bonds in the doped alloys, and therefore enhanced the yield strength and hardness, while excessive Nb content resulted in a decline in strength. Furthermore, the introduction of C into the Nb-doped alloy induced interstitial solid solution strengthening, this facilitates the formation of ionic bonds within the alloy, thereby enhancing its mechanical properties. The corresponding alloys were fabricated and subjected to hardness and mechanical tests to confirm the computational prediction. Notably, Ta-10.59W-5.36Nb-0.69C alloy exhibited yield strength 1119 MPa and hardness 399.5 HV, representing an increase of 90 and 60% compared with the undoped Ta-10W alloy. Generally, Nb and C co-doping significantly enhanced the room-temperature mechanical performance of Ta-10W alloy through synergistic substitutional and interstitial solid solution strengthening, providing new ideas for the design of Ta-W alloys.