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从合金相的结构与相图入手,探讨了B2型TiAl基合金(以γ相为基、含β/B2相的TiAl合金)成分、结构、组织与性能的相关性,分析了β/B2相细化合金的组织和提高材料的高温变形能力的原因,并阐述了B2型TiAl基合金超塑性变形的机理。在TiAl基合金中添加适量的β稳定型元素,形成较稳定的B2结构的有序相,有利于细化晶粒和提高材料的高温变形能力。这种B2型TiAl基合金可通过掺杂微量低序数元素以及随后的热加工工艺提高其综合性能,包括变形能力和高温性能。
Based on the structure and phase diagram of the alloy phase, the relationship between the composition, structure, microstructure and properties of B2 type TiAl-based alloy (TiAl alloy containing β / B2 phases based on γ phase) was discussed. Refine the structure of the alloy and improve the high temperature deformation ability of the material, and expounds the mechanism of the superplastic deformation of the B2 type TiAl-based alloy. Adding a suitable amount of β-stable elements into the TiAl-based alloy to form a more stable B2-structured ordered phase is advantageous for refining the grains and improving the high-temperature deformation capability of the material. This type B2 TiAl-based alloy can enhance its overall properties, including its deformability and high-temperature performance, by doping trace amounts of low-ordinal elements and subsequent thermal processing.