通过快速凝固和热机械加工提高纳米级 TiB2/Al 复合材料的强度-电导率协同效应

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

Materials Characterization Pub Date : 2024-11-05 DOI:10.1016/j.matchar.2024.114529

Lei Wang , Zhe Chen , Sanqiang Yang , Haowei Wang

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引用次数: 0

摘要

通过热等静压（HIP）与热机械加工相结合的方法，制备了由 5 wt% 的纳米级 TiB2 颗粒增强的铝-铜-锰（AA2219）复合材料，实现了优异的强度-电导率组合。结合综合表征和基于微观结构的分析，深入了解了强度-电导机制。结果表明，当前制备工艺下均匀分散的纳米级 TiB2 颗粒有助于提高复合材料的力学性能。在人工老化前引入预拉伸，可产生细小的θ'和S析出物。通过结合高分辨率 TEM 和晶体结构分析，确定了 TiB2/Al 界面的 Al（Cu）相和 S 相，它们与 Al 的不匹配度（δ）分别为 3.8 % 和 4.8 %。讨论了预拉伸效应对位错、θ'和 S 沉淀及相应结构形成的相关机制，以及 TiB2/Al 界面特性对强度和延展性的影响。

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Enhancing strength-ductility synergy in nano-sized TiB2/Al composite via rapid solidification and thermo-mechanical processing

The Al-Cu-Mn (AA2219) composite reinforced by 5 wt% nano-sized TiB₂ particles were fabricated by hot isostatic pressing (HIP) combined with thermal-mechanical processing to achieve a superior strength-ductility combination. Coupling the comprehensive characterizations and microstructure-based analysis, the strength-ductility mechanisms were deeply understood. Results reveal that the uniform dispersed nano-sized TiB₂ particles under the current preparation process helps to improve the mechanical properties of the composite. The introduction of pre-stretch before artificial aging produced a fine θ' and S precipitates. By combining high-resolution TEM and crystal structure analysis, Al(Cu) and S phase at TiB₂/Al interface were identified, and their mismatch (δ) with Al were 3.8 % and 4.8 %, respectively. Mechanisms related to pre-stretch effects on the formation of dislocation, θ' and S precipitates and corresponding structures are discussed, as well as the implications of TiB₂/Al interface characteristics on strength and ductility.

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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.