Tensile Properties of 7075 Aluminum Alloys Subjected to Pre-Fatigue in Humid Environment

Abstract:

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 of the pre-fatigue deformed specimens was performed by means of the Split Hopkinson pressure bar method. Within the authors set of experiments, 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 shown that the ductility of the pre-fatigue specimen was slightly lower than that of the non-fatigue specimen. Additionally, the pre-fatigue specimen in a high-humidity environment had a lower ductility than in a low-humidity environment. 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.

• Periodical: Materials Science Forum (Volumes 794-796)
• Pages: 538-543
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.794-796.538
• Online since: June 2014
• Authors: Hiroyuki Yamada*, Masaki Tsurudome, Nagahisa Ogasawara, Keitaro Horikawa
• Keywords: 7075 Aluminum Alloy, Ductility Loss, High-Humidity, Hydrogen, Impact, Pre-Fatigue, Quasi-Static, Tensile Properties

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