Interfacial design and strengthening mechanisms of AZ91 alloy reinforced with in-situ reduced graphene oxide

Journal Article · Sun Apr 15 00:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.02.011· OSTI ID:22805744

Yuan, Qiu-hong ^[1]; Qiu, Zhi-qiang ^[1]; Zhou, Guo-hua ^[2]; Zeng, Xiao-shu ^[1]; Luo, Lan ^[3]; Rao, Xi-Xin ^[1]; Ding, Yan ^[3]; Liu, Yong ^[1]

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1. Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi Province, Nanchang University, Nanchang 330031 (China)
2. Physical Science and Technology College, Yichun University, Yichun 336000 (China)
3. Department of Materials Science and Engineering, Nanchang University, Nanchang 330031 (China)

Highlights: • An in-situ process was developed to synthesize magnesium alloy composite reinforced by graphene. • Microstructure and phase composition of oxide films were investigated by OM, SEM, EDS and XRD analysis. • The interfacial structure of Mg composites reinforced with reduced graphene oxide was characterized. • The interfacial reaction mechanisms between GO (graphene oxide) and the Mg metal was studied. - Abstract: This work highlights to develop an in-situ process to disperse uniformly graphene possessing good interfacial bonds with the matrix of Mg alloy. A homogeneous distribution of graphene in the matrix has been successfully obtained through in-situ reduction of graphene oxide (RGO) by sintering process after the graphene oxide (GO) was uniformly dispersed in AZ91 powders. The interface product nano-sized MgO can significantly improve the interfacial bonding strength between RGO and α-Mg with analysis by transmission electron microscopy. The orientation relationships of ( 2-bar 00){sub MgO}//( 1-bar 10 2-bar ){sub α‐Mg} and [011]{sub MgO}//[2 4-bar 2 3-bar ]{sub α‐Mg} with the semi-coherent interface characteristics were clarified for the first time at the interface of MgO/α-Mg, suggesting a good lattice space matching. By employing such process, a composite containing 0.5 wt% of GO shows an 85.7% and 61.4% increase in yield strength and elongation, respectively, over unreinforced AZ91 alloy. The underlying strengthening mechanisms of in-situ reduced graphene oxide are discussed in detail.

• OSTI ID: 22805744
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 138; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
DISTRIBUTION
ELONGATION
GRAPHENE
INTERFACES
MAGNESIUM ALLOYS
MAGNESIUM OXIDES
MICROSTRUCTURE
NANOSTRUCTURES
SCANNING ELECTRON MICROSCOPY
SINTERING
THIN FILMS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YIELD STRENGTH