Overcoming strength-ductility trade-off in pelleted heterostructure titanium matrix composites by optimizing pellet size

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2025-01-31 DOI:10.1016/j.matchar.2025.114803

Lei Liu , Shufeng Li , Shaolong Li , Huiying Liu , Shaodi Wang , Dongxu Hui , Xin Zhang , Shota Kariya , Junko Umeda , Katsuyoshi Kondoh , Abdollah Bahador , Bolv Xiao , Zongyi Ma

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Abstract

Precisely controlling the spatial distribution of reinforcements and introducing heterogeneous grain structures are effective strategies for simultaneously enhancing the strength and ductility of titanium matrix composites (TMCs). However, achieving customized microstructure design in TMCs remains challenging. In this study, pelleted heterostructure Ti64-TiBw composites with varying pellet sizes (D50, D75, D150, and D250) were designed to systematically investigate the effect of pellet size on mechanical properties and deformation behavior. The results show that reducing pellet size significantly improves elongation, reaching a maximum of 11.5 %—an improvement of 219 % over homo-structure composites—without sacrificing strength. This improvement is attributed to increased matrix grain deformation at the crack tip in pelleted heterostructure Ti64-TiBw composites with smaller pellet sizes, coupled with enhanced strain redistribution between coarse- and fine-grained regions, which effectively inhibits crack propagation. This study offers a new pathway for precise microstructure design of TMCs, laying the foundation to overcome the strength-ductility trade-off and expand applications in high-performance metal matrix composites.

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通过优化球团尺寸克服球团异质结构钛基复合材料的强度-延性权衡

精确控制增强筋的空间分布和引入非均相晶粒结构是同时提高钛基复合材料强度和塑性的有效策略。然而，在tmc中实现定制的微观结构设计仍然具有挑战性。在这项研究中，设计了不同颗粒尺寸（D50, D75， D150和D250）的颗粒异质结构Ti64-TiBw复合材料，系统地研究了颗粒尺寸对力学性能和变形行为的影响。结果表明，减小颗粒尺寸可显著提高伸长率，在不牺牲强度的情况下，伸长率最高可达11.5%，比同质结构复合材料提高219%。这种改善是由于较小颗粒尺寸的颗粒状异质结构Ti64-TiBw复合材料裂纹尖端的基体晶粒变形增加，加上粗晶和细晶区域之间的应变再分布增强，有效地抑制了裂纹扩展。该研究为tmc的精确微观结构设计提供了新的途径，为克服强度-延性权衡和扩大高性能金属基复合材料的应用奠定了基础。

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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.