Ti和Al诱导相竞争对feconi基多组分合金的影响

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-08 DOI:10.1016/j.matchar.2025.115026

Xinghua Zhu , Bowen Chen , Qingguo Feng , Ning Wang , Lei Xiao , Yi Xu

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引用次数: 0

摘要

高Ti或/和Al含量引起的熵焓竞争使得体系的稳定性和析出相的强化作用难以捉摸。同时，Al-和Ti诱导的析出相之间的竞争促使人们有必要研究在高Al和高Ti含量的体系中是否能实现L12相的稳定和强化作用。本文采用第一性原理计算和实验方法，研究了等摩尔比FeCoNi、FeCoNiAl、FeCoNiTi和fecontial多主元素合金的稳定性和力学性能。结果表明，Ti增强FCC稳定性的作用可以抑制Al增强BCC稳定性的作用，但高含量的Ti与Al诱导的析出相之间的竞争使得体系不具有宏观延展性。此外，仅引入高含量Ti即可使体系具有较高的强度和一定程度的宏观塑性，这是FCC基体和l12型析出相共同作用的结果。此外，单独引入高Al含量使体系呈现BCC结构和脆性。这项工作为沉淀强化多组分合金的设计和利用提供了丰富的数据和见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Effect of Ti and Al induced phase competition on FeCoNi-based multi-component alloys

The competition between entropy and enthalpy caused by high contents of Ti or/and Al makes the stability of the system and the strengthening effect of the precipitates elusive. Meanwhile, the competition between Al- and Ti-induced precipitates promotes the need to investigate whether the stability and strengthening effect of the L1₂ phase can be realized in systems with high Al and Ti content. In this work, the stability and mechanical properties of equimolar ratio FeCoNi, FeCoNiAl, FeCoNiTi, and FeCoNiTiAl multi-principal elements alloys was investigated using first principles calculations and experiments. The results show that the effect of Ti to enhance the stability of FCC can inhibit the effect of Al to enhance the stability of BCC, but the competition between the high content of Ti and Al-induced precipitates makes the system not macroscopically ductile. In addition, the introduction of high content Ti alone brings high strength and some degree of macroscopic ductility to the system, which is attributed to the combined effect of FCC matrix and L1₂-type precipitates. Besides, the introduction of high Al content alone makes the system exhibit BCC structure and brittleness. This work provides a wealth of data and insights for the design and utilization of precipitate-strengthened multi-component alloys.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.