Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire
Abstract
:1. Introduction
2. Experimental Section
3. Results and Discussion
3.1. S-N Curve
3.2. Fracture Characteristics
3.3. Deformation Microstructures
4. Conclusions
- The fatigue strength defined at 107 cycles for the CPAW is determined to be ~90 MPa under tension–tension fatigue tests with a stress ratio R = 0.1.
- Fracture surfaces of the CPAWs fatigued at different stress amplitudes exhibit a four-stage characteristic, i.e., crack initiation region, planar crack propagation region, 45°-inclined crack propagation region and final rapid fracture region. The proportion of the planar crack propagation region decreases with increasing fatigue load. The crack growth mechanism for the CPAW is quite different from that for the coarse-grained materials. The cracks in the CPAWs firstly grow along the grain boundaries, and then propagate along the plane of maximum shear stress during the last stage of cycling, showing the distinctive crack growth mechanisms and fracture surfaces, i.e., the granular surface in the planar crack propagation region (Stage I) and the coarse fatigue striations in the 45°-inclined crack propagation region (Stage II).
- The GB migration was observed in the fatigued CPAWs. With increasing fatigue load, the dislocation recovery becomes more evident, and the GB migration rate increases, promoting the occurrence of softening and damage localization and resulting in the final failure.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Maximum Stress Amplitude (MPa) | 0 | 90 | 140 | 200 |
Average Grain Size (μm) | 0.39 | 0.39 | 0.41 | 0.45 |
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Hou, J.-P.; Wang, Q.; Yang, H.-J.; Wu, X.-M.; Li, C.-H.; Zhang, Z.-F.; Li, X.-W. Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire. Materials 2016, 9, 764. https://doi.org/10.3390/ma9090764
Hou J-P, Wang Q, Yang H-J, Wu X-M, Li C-H, Zhang Z-F, Li X-W. Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire. Materials. 2016; 9(9):764. https://doi.org/10.3390/ma9090764
Chicago/Turabian StyleHou, Jia-Peng, Qiang Wang, Hua-Jie Yang, Xi-Mao Wu, Chun-He Li, Zhe-Feng Zhang, and Xiao-Wu Li. 2016. "Fatigue and Fracture Behavior of a Cold-Drawn Commercially Pure Aluminum Wire" Materials 9, no. 9: 764. https://doi.org/10.3390/ma9090764