TiAl‐base alloys are a kind of promising materials for high‐temperature applications. The β phase existing in TiAl alloy can improve the hot workability, but deteriorates the creep properties. Preparing a β phase‐containing TiAl‐base alloy to enhance the hot workability before hot deformation and eliminating the β/B2 phase by postheat treatment to improve the service performance is a good strategy. Herein, a significant volume fraction of β phase is obtained in the Ti–46Al–4Nb–0.1B alloy by the elemental powder metallurgy (EPM), and the β/B2 phase is eliminated by the subsequent heat treatment. The results demonstrate that the microstructure of the EPMed Ti–46Al–4Nb–0.1B alloy predominantly consists of α₂/γ lamellar colonies, equiaxial γ grains, and some randomly distributed β phase and σ‐Nb₂Al phase. The β/B2 phase formed at the Nb‐enriched regions is caused by insufficient diffusion. The EPMed Ti–46Al–4Nb–0.1B alloy has a relatively low thermal deformation activation energy (Q, 410 kJ mol⁻¹), showed a well hot workability. The existence of the β phase is advantageous to harmonize the deformation of α₂/γ lamellar grains and to improve the deformability of the TiAl alloy. The subsequent heat treatment can eliminate the Nb‐enriched regions and the B2 phase to ensure good service performance.

中文翻译：

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通过元素粉末冶金引入可调节的β相，增强了Ti–46Al–4Nb–0.1B合金的热加工性能

TiAl基合金是一种有前途的高温应用材料。TiAl合金中存在的β相可以改善热加工性能，但会降低蠕变性能。制备含β相的TiAl基合金以提高热变形前的热加工性，并通过后热处理消除β/ B2相以改善使用性能是一个很好的策略。在此，通过元素粉末冶金（EPM）在Ti–46Al–4Nb–0.1B合金中获得了大量的β相体积分数，并且随后的热处理消除了β/ B2相。该结果表明，该EPMed的Ti-46Al-4NB-0.1B合金的显微组织主要是由α ₂ /γ层状菌落，等轴γ晶粒，部分随机分布的β相和σ -铌₂铝相。在Nb富集区域形成的β/ B2相是由于扩散不充分引起的。EPMed Ti–46Al–4Nb–0.1B合金具有较低的热变形活化能（Q，410 kJ mol ^-1），具有良好的热加工性能。β相的存在是有利的，以协调α的变形₂ /γ层状颗粒和改善的TiAl合金的可变形性。随后的热处理可以消除Nb富集区域和B2相，以确保良好的服务性能。