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摘要
The method combined with electrolytic hydrogenation and low-cycle fatigue was employed to simulatively study the change of mechanical properties of the 6061-T6 Al alloy, which was used as the liner of type III hydrogen storage cylinder in high-pressure hydrogen atmosphere and in the process of rapid charge/discharge hydrogen. It would provide data support for evaluating the long-term service safety and the reliability of the hydrogen storage cylinder. The results show that during electrolytic hydrogenation, some of the H atoms are adsorbed on the surface and surface oxide layer of the Al alloy, and others are dissolved into the lattices and grain boundaries of the Al alloy. It results in the reduction of strength and plasticity of the 6061Al alloy. Further, the effect of electrolytic hydrogenation on the plasticity of the Al alloy is more obvious. Low-cycle fatigue brings about the increases of yield strength, tensile strength and ratio yield-to-tensile strength, but the decrease of plasticity of the Al alloy. As increasing σmax, more brittle fracture on the tensile fracture surface of the Al alloy samples is presented. On combination of electrolytic hydrogenation and low-cycle fatigue, the strength of the 6061Al alloy increases slightly, however, the plasticity of the alloy decreases persistently. As increasing σmax, the reduction of plasticity of the 6061Al alloy speeds, and the quasi-cleavage fracture characteristic of tensile fracture surface of the Al alloy samples is more prominent, which cause the apparent decrease of service reliability of the 6061Al alloy. ? 2022, China Science Publishing & Media Ltd. All right reserved.
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