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| AN INVESTIGATION ON STRESS CORRoSION OF ALUMINUM ALLOY LC4 |
| Qiao Lijie; Wang Yong; Chu Wuyang and Xiao Jimei (Beijing University of Science and Teclmology) |
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Abstract The effects of strain rate and polarization potential on the sensitivity of SCC of aluminium alloy LC4 were investigated with slow strain rate tensile tests. The fracture area through SCC(A_(SCC)), the maximum tensile strength under SCC(σ_(SCC)) and the corresponding elongation (ε_(SCC)) were used as parameters for evaluating the sensitivity of SCC. The results indicated that the sensitivity of SCC increased with the decrease of strain rate, and A_(SCC) was more sensitive than σ_(SCC). Anodic polarization reduced A_(SCC); weak cathodic polarization increased σ_(SCC) slightly, and strong cathodic polarization decreased σ_(SCC). It showed that both mechanisms of hydrogen embrittlement and anodic dissolution were operative in this system. The fractographs were similar for the specimens fractured under the conditions of open circuit, cathodic polarization or after hydrogen charging, but quite different for those under anodie polarization. It showed that hydrogen embrittlement played a predominant role for this system under the comdition of open circuit.
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Received: 25 April 1992
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