Temperatures of critical points for a new Russian intermetallic TiAl-alloy Ti–44.5Al–2V–1Nb–Zr/Cr–0.1Gd (at.%) are determined theoretically (using Thermo-Calc software) and experimentally taking account of Zr content variation from 0.5 to 1.5 at.% (1.2–3.5 wt.%) and Cr content from 1.5 to 2.5 at.% (2.0–3.5 wt.%). It is shown that alloy solidification proceeds through β-phase and ends within the single β-phase field. Differential scanning calorimetry curves show four peaks corresponding to high-temperature transformations (L)/(L + β)/(β), (β)/(α + β)/(α), (α)/(α + γ), and low-temperature transformations (α + γ)/(α₂ + α + γ) and (α₂ + α + γ)/(α₂ + γ) in Zr-containing compositions, or (α + γ)/(α + γ + β), (α + γ + β)/(α₂ + α + γ + β), and (α₂ + α + γ + β)/(α₂ + γ + β) in Cr-containing compositions. The predicted sequence of phase fields on phase diagram polythermal sections is confirmed by experiment and it is found that critical point temperatures for the alloy studied do not change with the introduction of up to 0.1 at.% Gd.

一种新的俄罗斯金属间化合物 TiAl-合金 Ti–44.5Al–2V–1Nb–Zr/Cr–0.1Gd (at.%) 的临界点温度是从理论上确定的（使用 Thermo-Calc 软件）并在实验上考虑 Zr 含量变化0.5 至 1.5 at.% (1.2–3.5 wt.%) 和 1.5 至 2.5 at.% (2.0–3.5 wt.%) 的 Cr 含量。结果表明，合金凝固通过 β 相进行，并在单个 β 相场内结束。差示扫描量热曲线显示四个峰对应于高温转变 (L)/(L + β)/(β)、(β)/(α + β)/(α)、(α)/(α + γ) ，以及 含 Zr 组合物中的低温转变 (α + γ)/(α ₂  + α + γ) 和 (α ₂  + α + γ)/(α ₂ + γ)，或 (α + γ)/( α + γ + β), (α + γ + β)/(α ₂ +α+γ+β）和（α ₂  +α+γ+β）/（α ₂  +γ在含Cr的组合物+β）。实验证实了相图多热截面上相场的预测序列，并且发现所研究合金的临界点温度不会随着高达 0.1 at.% Gd 的引入而改变。