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Ti-Al-Fe 体系 bcc 相扩散系数及原子移动性
Diffusivities and Atomic Mobilities in the bcc Phase of the Ti-Al-Fe System
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- DOI:
- 作者:
- 佟健博 1，王向东 2，3，聂晶晶 2，3，黄 毅 2，3，白伟民 2，3，程 军 4
TONG Jianbo1, WANG Xiangdong2,3, NIE Jingjing2,3, HUANG Yi2,3, BAI Weimin2,3, CHENG Jun4
- 作者单位:
- 1. 中国航发北京航空材料研究院 先进钛合金航空科技重点实验室，北京 100095；2. 湘潭大学 材料科学与工程学院，湖南 湘潭 411105；3. 湘潭大学 材料设计及制备技术湖南省重点实验室，湖南 湘潭 411105；4. 西北有色金属研究院 陕西省医用金属材料重点实验室，陕西 西安 710016
1. Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys, AECC Beijing Institute ofAeronautical Materials, Beijing 100095; 2. School of Materials Science and Engineering, Xiangtan University, Xiangtan411105, China; 3. Key Laboratory of Materials Design and Preparation Technology of Hunan Province Xiangtan University,Xiangtan 411105, China; 4. Northwest Institute for Nonferrous Metal Research, Shaanxi Key Laboratory of Biomedical MetalMaterials, Xi'an 710016, China
- 关键词:
- 原子移动性；扩散系数；Ti-Al-Fe 合金；HitDIC 软件；CALPHAD
atomic mobility; diffusion coefficient; Ti-Al-Fe alloy; HitDIC; CALPHAD
- 摘要:
- 钛合金中合金元素的扩散行为对材料的制备、 加工、 服役等过程至关重要。 研究了 1 000 和 1 100 ℃时Ti-Al-Fe 体系 bcc 相中的元素扩散行为，制备了 8 对 bcc-Ti-Al-Fe 单相合金扩散偶。 分别在 1 000 ℃/8.5 h 和 1 100 ℃/7 h条件下进行扩散， 利用 EPMA 技术测定成分-距离曲线。 通过得到的成分-距离曲线， 采用 CALPHAD 方法建立了Ti-Al-Fe 体系 bcc 相的原子移动性数据库。在优化过程中，采用 HitDIC 软件得到了原子迁移率参数和互扩散系数。利用得到的原子移动性参数对扩散偶的扩散过程进行了模拟，计算结果与实验扩散特性(互扩散、组分-距离分布和扩散路径)一致，验证了该数据库的准确性。 这一研究成果对于深入理解钛合金的微观组织演变和性能具有重要意义。The diffusion behavior of elements in titanium alloys is crucial to the preparation, processing and service ofthese materials. In this paper, the diffusion behavior of alloying elements in the bcc phase of a Ti-Al-Fe system at 1 000and 1 100 ℃ was studied. Eight pairs of bcc-Ti-Al-Fe single-phase alloy diffusion couples were prepared and annealedat 1 000 and 1 100 ℃. The composition-distance profiles of these diffusion couples were determined by using EPMA. Anatomic mobility database of the bcc phase in the Ti-Al-Fe system was established by the CALPHAD (calculation of phasediagrams) approach based on the obtained diffusion coefficients. In the optimization process, HitDIC software was used toobtain the atomic mobility parameters and interdiffusion coefficient. Using the obtained atomic mobility parameters, thediffusion processes of the diffusion couples were simulated. The calculated results are consistent with the experimentaldiffusion characteristics (interdiffusion, composition-distance profiles and diffusion paths), indicating the accuracy of thedatabase. This research is highly important for further understanding the microstructure evolution and properties of titaniumalloys.