Anisotropic thermal expansion coefficient of multilayer graphene reinforced copper matrix composites

Multilayer graphene reinforced copper matrix (Cu-MLG) composites were fabricated via molecular-level mixing combined with vacuum hot-pressing (VHP). The MLG displayed a preferred orientation in the copper matrix, with the in-plane surface perpendicular to the hot-pressing direction, resulting in sig...

Full description

Saved in:
Bibliographic Details
Published in:Journal of alloys and compounds 2018-07, Vol.755 (C), p.114-122
Main Authors: Wang, Xueliang, Wang, Xin, Liu, Miao, Crimp, Martin A., Wang, Yaping, Qu, Zhiguo
Format: Article
Language:English
Subjects:
Anisotropy
Biological variation
Composite materials
Computer simulation
Copper
Graphene
Metal matrix composites
Molecular dynamics
Molecular dynamics simulations
Multilayers
Orientation effects
Preferred orientation
Pressing
Simulation
Temperature effects
Thermal expansion
Thermodynamic properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Multilayer graphene reinforced copper matrix (Cu-MLG) composites were fabricated via molecular-level mixing combined with vacuum hot-pressing (VHP). The MLG displayed a preferred orientation in the copper matrix, with the in-plane surface perpendicular to the hot-pressing direction, resulting in significant anisotropy in the thermal properties of Cu-MLG composites. Theoretical predictions were made using four models (Schapery, Kerner, Turner and mixture rule) to investigate the effect of the preferential orientation of MLG on the CTE anisotropy of Cu-MLG composites. The CTE anisotropy was further analyzed by carrying out molecular dynamics (MD) simulations to determine the variation in bond lengths for copper and MLG in different directions in the interface regions. The MLG bond length increased gradually with increasing temperatures in the in-plane direction, while in the out-plane directions, it increased significantly at first and then decreased at higher temperatures. The variations of bond lengths for MLG are consistent with the CTE anisotropy of the Cu-MLG composites in the same direction. [Display omitted] •Multilayer graphene (MLG) dispersed in copper matrix with a preferred orientation.•The thermal properties of Cu-MLG composites are of significant anisotropy.•The microstructure anisotropy is the main reason for the thermal property anisotropy.•The variation of MLG bond length is consistent with the thermal expansion behavior.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.04.325