Diffusion in High Entropy Alloys

高熵合金中的扩散

• 批准号: 314231017
• 负责人: Professor Dr. Sergiy Divinski
• 金额: --
• 依托单位: Lehrstuhl für Skalenübergreifende Thermodynamische und Kinetische Simulation
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/314231017?language=en
• 关键词: Diffusion; Entropy; Alloys

Diffusion in High Entropy Alloys (HEAs) is investigated using novel tracer-interdiffusion couple technique and compiled in an extended tracer diffusion database based on the pair-diffusion concept. While in the first funding period the focus lay on the establishment of the experimental and theoretical techniques as well as the general data base development, the proposed extension aims to examine systematically the tracer-interdiffusion couple method accounting for various situations which may be met in real multi-principal element alloys, including full miscibility, phase formation, complex interdiffusion paths, and strong volumetric changes. Simultaneously, the model description of diffusion in multicomponent HEAs has to be extended to account for vacancies as a separate species, ordering with appearance of different sub-lattices, influence of interstitially dissolved atoms and molar volume change along the interdiffusion path. The elaboration of the methodologies of experimental analysis and theoretic description will be done in a concerted way applying a combined experiment-modelling ansatz based on the CALPHAD-type description and the developed pair-wise diffusion model.Our research is motivated by the urgent need to provide reliable kinetic databases for adequate prediction of diffusion phenomena in multi-principal element alloys including both HEAs and compositionally complex alloys (CCAs). Furthermore, we will develop an automated assessment software for atomic mobilities and combine with the novel mobility database.A close and fruitful interaction with partners in the framework of SPP 2006 CCA-HEA will motivate and support the transfer of our insights and methods to other material classes and in particular to BCC HEAs and selected CCAs.

使用新型示踪剂相互扩散偶技术研究高熵合金 (HEA) 中的扩散，并在基于成对扩散概念的扩展示踪剂扩散数据库中进行编译。 虽然在第一个资助期间的重点是建立实验和理论技术以及通用数据库开发，但拟议的扩展旨在系统地研究示踪剂相互扩散耦合方法，以考虑实际中可能遇到的各种情况。多主要元素合金，包括完全混溶性、相形成、复杂的相互扩散路径和强烈的体积变化。同时，多组分 HEA 中扩散的模型描述必须扩展，以考虑作为单独物种的空位、不同子晶格的出现、间隙溶解原子的影响以及沿着相互扩散路径的摩尔体积变化的排序。实验分析和理论描述方法的阐述将通过应用基于 CALPHAD 型描述和开发的成对扩散模型的组合实验建模 ansatz 来协调进行。我们的研究是出于迫切需要提供可靠的动力学数据库，用于充分预测多主元素合金（包括 HEA 和成分复杂合金 (CCA)）中的扩散现象。此外，我们将开发原子迁移率自动评估软件，并与新颖的迁移率数据库相结合。在SPP 2006 CCA-HEA框架内与合作伙伴进行密切而富有成效的互动，将激励和支持我们的见解和方法向其他材料的转移类，特别是 BCC HEA 和选定的 CCA。