三维铝框架新型石墨片/6061Al基复合材料的显微结构与性能

doi:10.19976/j.cnki.43-1448/TF.2026005

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Abstract Aiming at the key issues of graphite flakes (GFs)/Al matrix composites, i.e., significant anisotropy and poor through-plane thermal conductivity and mechanical properties, in this study, a three-dimensional aluminum foam (Al_f) was introduced to fabricate the GFs/6061Al_f matrix composites via spark plasma sintering. Their microstructure and properties were also investigated, compared with those of the conventional GFs/6061Al matrix composites. The results demonstrate that the GFs/6061Al_f matrix and GFs/6061Al matrix composites sintered at 610 ℃ are both dense, and no interfacial reaction product Al₄C₃ is detected. With the increase of the GFs content, the relative density, through-plane thermal conductivity, coefficient of thermal expansion, bending strength, and bending strain of the composites all decrease, however, the in-plane thermal conductivity of the composites gradually increases. In the GFs/6061Al_f matrix composites, the Al_f has a 3D continuous structure, which is beneficial to the improvement of plasticity. Meanwhile, the GFs are sealed in each small pocket of the Al_f, resulting in lower distribution orientation degree of GFs, and thus enhancement of through-plane thermal conductivity of the composites. The through-plane thermal conductivity and bending strain of the GFs/6061Al_f matrix composite with a 45% GFs volume fraction are 38 W/(m·K) and 4.4%, 23% and 100% higher than those of the GFs/6061Al matrix composite, respectively. This strategy has apparent advantages in reducing anisotropy and brittleness of the GFs/Al matrix composites.

Key words： GFs/Al matrix composite spark plasma sintering aluminum foam microstructure thermophysical property mechanical property

Received: 14 January 2026 Published: 07 May 2026

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	PENG Ziyue
	LIU Junfu
	NIE Qiangqaing
	TANG Wenming

Cite this article:

PENG Ziyue,LIU Junfu,NIE Qiangqaing, et al. Microstructure and properties of novel graphite flakes/6061Al matrix composites with three-dimensional Al frame[J]. Materials Science and Engineering of Powder Metallurgy, 2026, 31(2): 176-187.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2026005 OR http://pmbjb.csu.edu.cn/EN/Y2026/V31/I2/176

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