Enhanced Damping Capacity in Graphene-Al Nanolaminated Composite Pillars Under Compression Cyclic Loading
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tal matrix composites (MMCs) incorporate hard reinforcements into the relatively soft metal matrix and possess properties greater than the individual constituents and/or their alloy counterparts. Since being reported by Novoselov et al.[1] in 2004, graphene has attracted a wide range of interests due to its outstanding electron transport properties such as very high carrier density of 1013 per square centimeter and high electron mobilities of ~ 10,000 square centimeters per voltsecond at room temperature. In addition, graphene is considered a promising reinforcement for high-performance MMCs due to its excellent intrinsic mechanical
ANLIANG LU, LEI ZHAO, YU LIU, ZHIQIANG LI, and DING-BANG XIONG are with the State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China. Contact e-mail: [email protected] JIN ZOU is with the Materials Engineering and Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, St. Lucia, QLD, 4072, Australia. QIANG GUO is with the State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University. Contact e-mail: [email protected] Manuscript submitted November 11, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
properties. In the pristine single-crystalline form, graphene has extremely high strength (~ 130 GPa) and high Young’s modulus (~ 1 TPa).[2] Even if graphene contains a certain concentration of crystalline defects, its intrinsic properties still prevail over those of conventional fiber and particle reinforcements.[3,4] Generally, graphene is randomly introduced into metal matrix to form graphene-metal composites by energetic co-milling processes.[5] Compared with the unreinforced matrix, the strength and modulus of graphene-metal composites with a random distribution of graphene are significantly improved, however, these improved properties are usually achieved at the expense of tensile ductility and/ or fracture toughness, limiting the potential application of these composites.[6,7] To alleviate the strength–ductility conflict in MMCs, extensive research efforts have been dedicated to the fabrication and characterization of composites with elaborately designed structures, such as bimodal structure,[8] ring-like structure,[9] harmonic structure,[10] nanolaminated structure.[11] Considering the two-dimensional planar structure of graphene and the advantages of nanolaminated structure that renders excellent strength–toughness synergy in hard biological materials,[12] we recently developed graphene (reduced graphene oxide, RGO)-aluminum (Al) composites with a nanolaminated structure by a modified powder metallurgy fabrication route.[13,14] Uniaxial tensile tests carried out on the composite specimens revealed that the composite had notably higher strength over the corresponding pure Al counterpart obtained by the same fabrication route, without sacrificing tensile ductility.[13] These studies also indicate that graphene at the lamella interfaces can not only have strengthening capability due to its load-s
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