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| Relationship between Microdefects and Mechanical Properties of ZL205A Aluminum Alloy after Long-time Storage |
| Received:September 15, 2023 Revised:October 10, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.10.003 |
| KeyWord:ZL205A microdefects room temperature tensile high temperature tensile room temperature fatigue room temperature impact |
| Author | Institution |
| YAN Lu |
Beijing Institute of Astronautical Systems Engineering, Beijing , China |
| LIU Bin-bin |
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing , China |
| QU Bin-rui |
Beijing Institute of Astronautical Systems Engineering, Beijing , China |
| SUN Wen-dong |
China Astronautics Standards Institute, Beijing , China |
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| Abstract: |
| The work aims to evaluate the effect of microdefects on the properties of ZL205A aluminum alloy after long-time storage. The X-ray non-destructive testing was firstly introduced to study the distribution of microdefect levels and then mechanical propertied including room temperature and high temperature tensile, room temperature fatigue and room temperature impact were investigated. After storage at room temperature for 12 years, the microdefect levels of ZL205A aluminum alloy ranged from 1 to 6, while a few associated band segregations were determined as well. The room temperature tensile strength of samples with microdefect level from 1 to 3 was around 380 MPa, but it decreased to 340.5 MPa in the samples with microdefect level 5. The results indicated that microdefect level higher than 4 had great impact on the tensile strength at room temperature. However, the trend of higher microdefect level leading to larger tensile strength was only observed at 100 ℃ during high temperature tensile. Room temperature fatigue tests indicated that the fatigue limit of ZL205A alloy was 99.2 MPa under the fatigue life capability of 107 cycles. The average impact absorbed energy of samples with microdefect level 1 was 3.19 J, obviously higher than that of samples with lower microdefect levels. The room temperature tensile and impact properties show strong dependence on the microdefect levels. At high temperature tensile, the decrease of strength is determined by temperature rather than microdefect levels. |
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