OS1702 Effect of Strain Rate on Ductility Loss Induced by Pre-fatigue Deformation in 7075 Aluminum Alloys
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In this study, the tensile properties of the quasi-static and the impact tests for 7075 aluminum alloys subjected to pre-fatigue deformation in a humid environment were investigated. An impact tensile test was performed by means of the Split Hopkinson pressure bar method. The flow stress in both the quasi-static and the impact tests was unaffected by the pre-fatigue deformation. On the other hand, it was clarified that the ductility of the pre-fatigue specimen was slightly lower than that of the non-fatigue specimen. The ductility of the quasi-static test was decreased as compared with the impact test. It is thought that the ductility loss occurred due to changes in the microstructure, such as dislocations caused by the presence of hydrogen in the specimen due to pre-fatigue deformation in a high-humidity environment.
