Characterization of the reaction products and precipitates at the interface of carbon fiber reinforced magnesium–gadolinium composite

Journal Article · Tue Mar 15 00:00:00 EDT 2016 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2015.10.004· OSTI ID:22587123

Wang, Yaping ^[1]; Jiang, Longtao ^[1]; Chen, Guoqin ^[1]; Lin, Xiu ^[2]; Zhang, Shaofeng; Pei, Risheng; Wu, Gaohui ^[1]

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1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 (China)
2. Heilongjiang Academy of Industrial Technology, Harbin 150001 (China)

In the present work, carbon fiber reinforced magnesium-gadolinium composite was fabricated by pressure infiltration method. The phase composition, micro-morphology, and crystal structure of reaction products and precipitates at the interface of the composite were investigated. Scanning electron microscopy and energy dispersive spectroscopy analysis revealed the segregation of gadolinium element at the interface between carbon fiber and matrix alloy. It was shown that block-shaped Gd4C5, GdC2 and nano-sized Gd2O3 were formed at the interface during the fabrication process due to the interfacial reaction. Furthermore, magnesium-gadolinium precipitates including needle-like Mg5Gd (or Mg24Gd5) and thin plate-shaped long period stacking-ordered phase, were also observed at the interface and in the matrix near the interface. The interfacial microstructure and bonding mode were influenced by these interfacial products, which were beneficial for the improvement of the interfacial bonding strength. - Highlights: • Gadolinium element segregated on the surface of carbon fibers. • Block-shaped Gd{sub 4}C{sub 5} and GdC{sub 2} were formed at the interface via chemical reaction. • Gadolinium and oxygen reacted at the interface and formed nano-scaled Gd{sub 2}O{sub 3}. • The precipitates formed in the interface were identified to be Mg{sub 5}Gd (or Mg{sub 24}Gd{sub 5}) and plate-shaped long period stacking-ordered phase.

• OSTI ID: 22587123
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 113; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ALLOYS
BONDING
CARBON FIBERS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
ELECTRON SCANNING
GADOLINIUM
GADOLINIUM OXIDES
INTERFACES
MAGNESIUM
MICROSTRUCTURE
MORPHOLOGY
NANOSTRUCTURES
PLATES
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
SEGREGATION
SPECTROSCOPY
SURFACES