The creep properties of fully lamellar γ/α₂ titanium aluminides can be significantly improved by alloying with Nb, Ta or Zr. While the influence of these alloying elements on the γ-phase has already been examined, their diffusivity and strengthening properties in the α₂-phase are still lacking. In order to study the effect of Nb, Ta and Zr in α₂-Ti₃Al, the alloys Ti-33Al, Ti-33Al-5Nb, Ti-33Al-5Ta and Ti-33Al-5Zr were investigated using a diffusion couple approach and strain rate jump tests. The results show that Zr diffuses the fastest, followed by Nb and Ta. Furthermore, these alloying elements also increase the strength compared to a binary Ti-33Al alloy, from which Zr leads to the highest strength increase followed by Ta and Nb. The lower diffusivity of Ta becomes increasingly important at higher temperatures and lower strain rates resulting in a higher strengthening potential than Nb and Zr under such conditions.

通过与Nb、Ta或Zr合金化可以显着改善全层状γ/α ₂钛铝化物的蠕变性能。虽然已经研究了这些合金元素对γ相的影响，但它们在α ₂相中的扩散性和强化性能仍然缺乏。为了研究Nb、Ta和Zr在α ₂ -Ti ₃ Al中的影响，采用扩散偶方法对Ti-33Al、Ti-33Al-5Nb、Ti-33Al-5Ta和Ti-33Al-5Zr合金进行了研究和应变率跳跃测试。结果表明，Zr扩散最快，其次是Nb和Ta。此外，与二元 Ti-33Al 合金相比，这些合金元素还提高了强度，其中 Zr 导致强度增加最高，其次是 Ta 和 Nb。 Ta 的较低扩散率在较高温度和较低应变速率下变得越来越重要，导致在这种条件下比 Nb 和 Zr 具有更高的强化潜力。