Research progress of microstructure transformation and kinetics in Ti2AlNb-based alloy
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摘要: 起源于钛合金的Ti2AlNb基合金作为一种新型高温结构材料，具有优秀的室温韧性、抗裂性能、高温强度及抗氧化性，在航空航天领域呈现出广阔的应用前景。研究Ti2AlNb基合金的微观组织转变机制及相关动力学，对材料成分设计和加工工艺的优化以获得所需性能具有重要的意义。本文总结了Ti2AlNb基合金中组织转变及其动力学机制的研究进展和不足，重点阐述了Ti2AlNb基合金内B2相和O相的生长动力学研究现状，并指出Ti2AlNb基合金在有序无序转变动力学、缺陷密度相关动力学等方面缺乏研究。未来Ti2AlNb基合金需要结合逐渐全面的动力学研究成果来建立组织演变理论模型，从而优化合金成分及工艺，以满足更加复杂严峻的服役环境。
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关键词:
- Ti2AlNb基合金 /
- 相变 /
- 动力学 /
- 微观组织调控
Abstract: As a new high-temperature structural material, Ti2AlNb-based alloy originated from titanium alloy has excellent room temperature toughness, crack resistance, high temperature strength, oxidation resistance and other advantages, showing a broad application prospect in the aerospace field. To study the microstructure transformation mechanism and related kinetics of Ti2AlNb alloy is of great significance to the alloy composition design and process optimization to obtain the required properties. This paper summarizes the research progress and deficiency of the structure transformation and the dynamic mechanism in Ti2AlNb-based alloy, focuses on the research status of the growth kinetics of B2 phase and O phase at home and abroad in recent years, and points out that there is lack of research on the order disorder transformation kinetics, defect density related dynamics of Ti2AlNb-based alloy. In the future, Ti2AlNb-based alloy needs to be combined with gradually comprehensive dynamics research results to establish a theoretical model of microstructure evolution, so as to optimize alloy composition and process to meet more complex and severe service environment.-
Key words:
- Ti2AlNb-based alloy /
- phase transformation /
- dynamics /
- microstructure regulation
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图 7 O相生长动力学研究结果[40] (a)不同温度下层状O相厚度与时间的关系； (b)不同温度下ln d与ln t 的关系；(c)不同时效时间下
${\rm{ln}}( \dfrac{d{\rm{o}}^2}{t}) $ 与1/ T 的关系Figure 7. Results of O phase growth kinetics[40] (a) relationship between thickness and time of lamellar O phase at different temperatures； (b) relationship between ln d and ln t at different temperatures； (c) relationship between
${\rm{ln}}( \dfrac{d{\rm{o}}^2}{t})$ and 1/ T under different aging time -
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