(Al3Ti-TiN-AlN)/2024Al composite with an unprecedented backbone-like quasi-continuous network structure: Exceptional strength-ductility synergy and heat resistance

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

Materials Characterization Pub Date : 2025-03-17 DOI:10.1016/j.matchar.2025.114937

Weici Zhuang , Zhenying Huang , Xue Li , Youbo Wu , Qianwen Sun , Ziling Liao , Ziqiang Zhu , Haozheng Han , Wenqiang Hu , Dingfeng Pei , Yang Zhou

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Abstract

Aluminum matrix composites face challenges in core structural applications under harsh environments due to grain rotation under elevated temperatures and external loads. Herein, a novel ‘Backbone-like’ quasi-continuous network structured (Al₃Ti-TiN-AlN)/2024Al composite with balanced strength-ductility and heat resistance was fabricated using Ti₂AlN as precursor, featuring needle-like and granular micro-Al₃Ti, meso-TiN, and densely dispersed intragranular nano-AlN within the matrix. After T6 treatment, the composite achieves impressive strength-ductility compatibility (470 MPa and 6 %) at room temperature, maintains strong performance (172 MPa) at 400 °C, and exhibits a low coefficient of thermal expansion of 19 × 10⁻⁶/°C. The enhanced strength-ductility across a wide temperature range benefits from the nanoparticle pinning of dislocations and grain boundary sliding at the microscale, combined with the network skeleton's drag effect on matrix flow at the macroscale. This work extends the service temperature of 2024Al composites for structural applications to 400 °C.

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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.