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RESEARCH PAPERS

Mechanical Behavior in the Silicon Carbide Reinforced Aluminum 6061 Composites Degraded by Room or High Temperature 3.5% NaCl Solution

[+] Author and Article Information
J. J. Ahn, S. Ochiai

International Innovation Center, Kyoto University, Sakyo, Kyoto 606-8501, Japan

J. Eng. Mater. Technol 126(4), 436-442 (Nov 09, 2004) (7 pages) doi:10.1115/1.1789961 History: Received August 26, 2003; Revised May 06, 2004; Online November 09, 2004
Copyright © 2004 by ASME
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Figures

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Shape of specimen used for immersion corrosion test and tensile test
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Micrographs of the corroded part in the (a) RC- and (b) HC-AA6061. Typical corrosion phenomenon was local corrosion-pitting in the RC-AA6061 while corrosion of the HC-AA6061 occurred by local corrosion-pitting and intergranular corrosion
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Typical micrographs of the corroded part in the (a) RC- and (b) HC-5% SiCp/Al observed under a scanning electron microscope. Corrosion reaction of the RC- and HC-SiCp/Al was the same as the RC- and HC-AA6061, respectively
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Fracture surface of the RC-10% SiCp/Al after tensile tests. Interfacial cracks initiated from the pit were observed between the SiC particles
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Micrographs of the fracture surfaces for the (a) RC- and (b) HC-10% SiCp/Al after tensile tests
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Variation in the tensile strength (proof stress, σ0.2%, and ultimate tensile strength, σUTS) in terms of SiC volume fraction in the noncorrosively degraded, RC- and HC-samples
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Variation of σCorrOR in the RC- and HC-samples (the ratio of the tensile strength of the RC- and HC-samples, σCorr, to that of the noncorrosively degraded samples, σOR)
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Variation in the reduction of tensile strength, Δσ (=σOR−σCorr) as a function of average diameter of pits, Dpit, observed on the surfaces of the RC-samples. Average diameter range of pit predicted by regression analysis in the Δσ̣̄−Dpit relation when Δσ0.2%=0.5σOR is presented as hatched lines together
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Variation in the tensile strength of the HC-samples, σCorr, in terms of Λ (=ACorr/AOR; the ratio of the corroded area measured at the fracture surface, ACorr, to cross-section area of a specimen, AOR). Λ value range predicted by regression analysis in the σ̣̃-Λ̣ relation when σcorr=0.5σOR is presented as hatched lines together
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The relation between the tensile strength, σCorr, and the corresponding hardness, Hν, of the RC-samples. Coefficients of determination, R2, obtained from regression analysis were described together. Micrograph (upper right) shows oxidation film formed on the surface of the RC-AA6061

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