Research on the Corrosion Fatigue Property of 2524-T3 Aluminum Alloy
Abstract
:1. Introduction
2. Materials and Experimental Methods
3. Results and Discussion
3.1. S-N Curves
3.2. Fracture Analysis
- A—corrosion pitting and crack-oriented zone;
- B—fatigue crack propagation zone;
- C—rapid fatigue fracture zone.
3.2.1. Fatigue Source and the Initial Stage of Fatigue Crack Propagation
3.2.2. Stable Stage of Fatigue Crack Propagation
3.2.3. Stage of Rapid Fatigue Crack Propagation and Fatigue Fracture
4. Conclusions
- Under the condition of R = 0, 3.5% NaCl corrosion solution, and the loading cycles of 106, the horizontal and longitudinal corrosion fatigue limits of the 2524-T3 aluminum alloy are 495 and 523 MPa, respectively. The horizontal fatigue corrosion performance is slightly better than the performance of longitudinal corrosion.
- In the morphology of the fatigue fracture, the crack closure of the fatigue source region is mainly affected by the roughness. As the crack expands, the mechanism that affects the crack closure in the medium and high-stress zone has changed from roughness induction to plastic zone induction. In the later stage of crack propagation, the crack may directly tear through several grains under each load, so the section in a small area appears very flat.
- Fatigue cracks mainly originate from corrosion pits. In the initial stage of crack propagation, the fracture surface shows a mixed characteristic of ductile fracture and cleavage fracture. The cracks propagate on different crystal planes, forming small steps with different heights and deflected tear ridges.
- During the stable propagation stage of fatigue cracks, the cracks mainly propagate through the double-slip mechanism. At this stage, clear, smooth, and parallel plastic fatigue striations can be observed. The width of fatigue striations increases with the crack length or the amplitude of the stress intensity factor, and the striation direction is perpendicular to the local crack propagation direction. When the fatigue striations pass through the coarse second-phase particles, they expand by bypassing the particles, indicating that the internal cracks of the alloy tend to expand in the direction of more inclusions, bridging larger debonded inclusions, and thus, the alloy’s fatigue resistance is weakened. In the rapid propagation/fracture stage, the crack propagation/fracture mechanism is transformed into a micro-holes connection mechanism. The main characteristic morphology at this stage is equiaxed dimples. Larger dimples are mixed with second-phase particles ranging in size from 1 to 5 μm. The relationship between dimples and second-phase particles is almost one-to-one, indicating that the nucleation of micropores mainly comes from the second-phase particles in the alloy.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Mg | Zn | Cu | Cr | Ti | Mn | Si | Fe | Al |
---|---|---|---|---|---|---|---|---|
1.25 | 0.005 | 4.66 | 0.001 | 0.03 | 0.59 | 0.025 | 0.035 | Bal. |
Stress Level Smax (MPa) | Fatigue Lifetime of Horizontal Samples | Fatigue Lifetime of Longitudinal Samples |
---|---|---|
190 | 205,856 | 175,863 |
190 | 235,896 | 168,566 |
190 | 317,856 | 125,622 |
190 | 295,586 | 192,546 |
190 | 281,658 | 186,245 |
180 | 302,564 | 324,556 |
180 | 398,564 | 285,644 |
180 | 412,563 | 385,475 |
180 | 405,532 | 265,456 |
180 | 546,238 | 326,384 |
170 | 795,562 | 475,631 |
170 | 682,536 | 568,965 |
170 | 865,893 | 589,625 |
170 | 795,236 | 532,563 |
170 | 800,522 | 589,632 |
160 | 862,456 | 632,632 |
160 | 879,446 | 612,563 |
160 | 952,453 | 685,136 |
160 | 924,522 | 692,369 |
160 | 852,365 | 663,156 |
150 | 1,000,000 | 1,000,000 |
150 | 1,000,000 | 994,633 |
150 | 1,000,000 | 1,000,000 |
150 | 996,223 | 1,000,000 |
150 | 1,000,000 | 1,000,000 |
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Liu, C.; Ma, L.; Zhang, Z.; Fu, Z.; Liu, L. Research on the Corrosion Fatigue Property of 2524-T3 Aluminum Alloy. Metals 2021, 11, 1754. https://doi.org/10.3390/met11111754
Liu C, Ma L, Zhang Z, Fu Z, Liu L. Research on the Corrosion Fatigue Property of 2524-T3 Aluminum Alloy. Metals. 2021; 11(11):1754. https://doi.org/10.3390/met11111754
Chicago/Turabian StyleLiu, Chi, Liyong Ma, Ziyong Zhang, Zhuo Fu, and Lijuan Liu. 2021. "Research on the Corrosion Fatigue Property of 2524-T3 Aluminum Alloy" Metals 11, no. 11: 1754. https://doi.org/10.3390/met11111754