Stimulating strain hardening ability to achieve excellent ductility for aluminum matrix composites by activating hetero-deformation induced hardening through designing grain partition

IF 7.7 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2026-02-01 Epub Date: 2026-01-30 DOI:10.1016/j.coco.2026.102739

Yulei Li , Xin Zhang , Jun Wang , Xin Li , Dongxu Hui , Shaodi Wang , Yifan Liang , Bo Li , Shengyin Zhou , Shufeng Li

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Abstract

In this study, a bimodal heterostructure TiB₂/Al composites with designable coarse/fine grain partition were fabricated by combining multi-stage ball milling with a powder assembly process during powder metallurgy. The effects of different coarse/fine-grained fractions on the microstructure and mechanical properties of heterostructure composites were systematically investigated. The results demonstrate that the bimodal heterostructure can induce additional hetero-deformation induced (HDI) hardening compared to the fine-grained homogenous structure composites, effectively enhancing dislocation storage of coarse-grained zones and plastic deformation capability of fine-grained zones. Thereby promoting the strength-ductility synergy of the composites. When the coarse-grained mass fraction reaches 25 wt% (HS25), the elongation to failure of the bimodal heterostructure TiB₂/Al composites increases from 8.1% for homogenous structure composites to 13%. Moreover, its strength rises by 11% compare to the heterostructure composites with 50 wt% coarse grain (HS50) without compromising the ductility. It provides an inspired strategy for developing Al matrix composites with coordinated matching of strength and ductility.

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通过设计晶粒分配激活异质变形诱导硬化，从而激发应变硬化能力，使铝基复合材料具有良好的延性

在本研究中，采用粉末冶金中的多级球磨和粉末组装相结合的方法制备了具有可设计的粗/细晶粒划分的双峰异质结构TiB2/Al复合材料。系统研究了不同粗/细晶组分对异质结构复合材料显微组织和力学性能的影响。结果表明：与细晶均相复合材料相比，双峰异质组织可诱发额外的异质变形诱导硬化（HDI），有效增强了粗晶区的位错储存和细晶区的塑性变形能力；从而促进复合材料的强度-延性协同作用。当粗晶质量分数达到25 wt% （HS25）时，双峰异质组织TiB2/Al复合材料的失效伸长率从均匀组织复合材料的8.1%提高到13%。此外，与含有50%粗晶的异质结构复合材料（HS50）相比，其强度提高了11%，而塑性不受影响。这为开发强度和延性协调匹配的铝基复合材料提供了一种有启发性的策略。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.