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<p>As promising high-temperature materials, γ-TiAl alloys encounter application challenges due to their limited room-temperature ductility, insufficient high-temperature strength, and poor oxidation resistance. TiAl-4822 (Ti-48Al-2Cr-2Nb at. %) addresses these limitations via controlling Cr and Nb alloying additions to optimize the mechanical and microstructural characteristics. This study investigated the optimal doping positions of Cr and Nb in the γ phase of TiAl-4822 alloy and their impacts on the microstructure and mechanical performance by integrating Density Functional Theory (DFT), XRD (X-ray Diffraction) Rietveld refinement, and additive manufacturing technology. The results suggest that the Nb and Cr atoms preferentially substitute Ti sites, uniformly distributed in the γ phase of the second deposited layer, forming a (Ti<sub>0.92</sub>Nb<sub>0.04</sub>Cr<sub>0.04</sub>)Al structure. This lattice configuration exhibits the optimal structural and thermodynamic stability. The mechanical tests demonstrated significant enhancements in Young’s modulus across all directions compared to binary γ-TiAl, indicating improved mechanical performance. This work provides theoretical support for the study on microstructure and mechanical properties of TiAl-4822 by revealing the most stable configurations of Cr and Nb and their effects on the mechanical properties of TiAl alloy.</p>

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Structure and mechanical properties of γ‑Ti‑48Al‑2Cr‑2Nb alloy processed by additive manufacturing

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Jianzhou Huang,
  • Dongdong He,
  • Han Miao,
  • Peng Cheng,
  • Zhen Zhang,
  • Xingguang Jin,
  • Guangyao Chen,
  • Yang Ren,
  • Caijuan Shi,
  • Qisheng Feng,
  • Pengyue Gao,
  • Chonghe Li

摘要

As promising high-temperature materials, γ-TiAl alloys encounter application challenges due to their limited room-temperature ductility, insufficient high-temperature strength, and poor oxidation resistance. TiAl-4822 (Ti-48Al-2Cr-2Nb at. %) addresses these limitations via controlling Cr and Nb alloying additions to optimize the mechanical and microstructural characteristics. This study investigated the optimal doping positions of Cr and Nb in the γ phase of TiAl-4822 alloy and their impacts on the microstructure and mechanical performance by integrating Density Functional Theory (DFT), XRD (X-ray Diffraction) Rietveld refinement, and additive manufacturing technology. The results suggest that the Nb and Cr atoms preferentially substitute Ti sites, uniformly distributed in the γ phase of the second deposited layer, forming a (Ti0.92Nb0.04Cr0.04)Al structure. This lattice configuration exhibits the optimal structural and thermodynamic stability. The mechanical tests demonstrated significant enhancements in Young’s modulus across all directions compared to binary γ-TiAl, indicating improved mechanical performance. This work provides theoretical support for the study on microstructure and mechanical properties of TiAl-4822 by revealing the most stable configurations of Cr and Nb and their effects on the mechanical properties of TiAl alloy.