Analysis of Elevated-Temperature Impact Fractures of Graphite-Reinforced Aluminum Composites.
AEROSPACE CORP EL SEGUNDO CALIF MATERIALS SCIENCES LAB
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Instrumented dynamic three-point bend tests were performed on graphite-fiber-reinforced aluminum composites after rapidly heating the specimens to temperatures between room temperature and 550C. Thornel 50 graphite fiber reinforced-202 Al casting alloy composites were used. Optical metallography and scanning electron fractography were used to determine the role of the matrix in the fracture process. The 202 Al alloy contains a low melting constituent that melts at 548C. Segregation of this constituent to grain boundaries during fabrication of the composite causes eutectic melting after heating to high temperatures greater than 540C and hot-short failures.
- Laminates and Composite Materials