Transverse Fracture Behavior of Graphite-Aluminum Composites

A determination was made of the transverse tensile strength of graphite-aluminum composites produced from various fiber and matrix compositions and by a variety of processing methods. Processing methods included the standard Ti-B chemical vapor deposition process and modifications to that process, t...

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Bibliographic Details
Main Authors: Amateau,Maurice F, Dull,Dennis L
Format: Report
Language:English
Subjects:
ACRYLONITRILE POLYMERS
Aluminum alloy 1100
Aluminum alloy 201
Aluminum alloy 6061
ALUMINUM ALLOYS
Ceramics, Refractories and Glass
COMPOSITE MATERIALS
ELECTRON MICROSCOPES
FIBERS
FRACTURE(MECHANICS)
GRAPHITE
Laminates and Composite Materials
MATRIX MATERIALS
Mechanics
METAL COATINGS
Metallurgy and Metallography
NICKEL
RAYON
TENSILE STRENGTH
TRANSVERSE
VAPOR DEPOSITION
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Summary:A determination was made of the transverse tensile strength of graphite-aluminum composites produced from various fiber and matrix compositions and by a variety of processing methods. Processing methods included the standard Ti-B chemical vapor deposition process and modifications to that process, the sodium process, and the nickel-coated fiber method. Precursor rayon, pitch, high-modulus polyacrylonitrile (PAN) and low-modulus PAN fibers were investigated, as well as 201, 6061, and 1100 aluminum-alloy matrices. The transverse fracture strength is influenced by the processing method and the type of fiber but not by the matrix alloy. Those processes and fibers that promote fiber-matrix reaction result in the highest transverse strength. The fractured surfaces, as examined by scanning electron microscopy, revealed fiber-matrix separation and fiber pullout as the dominant features of low-transverse-strength composites. Fiber splitting and the absence of fiber pullout were characteristic of the high-transverse-strength composites. (Author)