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マテリアルサイエンス系セミナー（第５回）
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Deformation Mechanism and Interfacial Properties
of Nanolaminated Grafhene-AI Composites
講演者：Professor Qiang Guo
Associate professor in the school of Materials Science ＆ Engineering and the State
Key Laboratory of Metal Matrix, Composites in Shanghai Jiao Tong University
日
場
時：平成２８年８月８日（月）１４：００～１５：３０
所：マテリアルサイエンス系講義棟１階 M１M２講義室
講演要旨：
Conventional metal matrix composites are characterized by a random and uniform
distribution of reinforcements in the matrix, and usually suffer from a conflict between
strength and toughness. In the past few years, microstructural heterogeneity, such as
gradient, laminated, and inter-penetrating structures, is often adopted to improve the
strength-toughness synergy. In this work, bulk graphene-reinforced Al matrix
composites of various reinforcement concentrations were fabricated via a modified
powder metallurgy approach. These composites possessed a bio-inspired
nanolaminated, structure, where layers of ~200nm-thick pure Al layers were
separated by graphene sheets, each containing several graphene monolayers. The
composites were shown to have substantially higher Young's moduli and uniaxial
tensile strengths than those of unreinforced Al matrix prepared using the same
fabrication route. Moreover, the composites possessed comparable total elongations
as the Al matrix. Combined with post-mortem and in situ transmission electron
microscopic (TEM) analysis, our findings were interpreted in terms of the effective
load transfer between the graphene sheets and Al platelets, the interaction between
mobile dislocations and the graphene-Al interfaces, and a toughening mechanism
provided by the laminated structure.
講演者略歴：
2010
Ph.D. in advanced materials, National University of Singapore, under the
Singapore-MIT Alliance (SMA) program,
2010 Postdoc in Dept. of Applied Physics and Materials Science in Caltech,
2012 Associate professor in the School of Materials Science & Engineering and the
State Key Laboratory of Metal Matrix Composites in Shanghai Jiao Tong
University, China.
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