Influence of Multi-Holes on Fatigue Behaviors of Cast Magnesium Alloys Based on In-Situ Scanning Electron Microscope Technology
Abstract
:1. Introduction
2. Experimental and Material
3. Fatigue Experimental Results
4. Analysis and Discussion
4.1. Effect of Tilted Angles of Multi-holes on Fatigue Behavior of Cast AM60B Alloy
4.2. Effect of Tilted Angles of Multi-holes on Fatigue Behavior of Cast AZ91 Alloy
4.3. Validation of Fatigue Behavior by Using Finite Element Method
5. Conclusions
- For cast AZ91 alloy, the fatigue crack propagation behavior is more sensitive to changes in the distance between the two small holes than that of cast AM50 and AM60B alloys. This is because the plastic deformation capability of the former is much lower than that of the latter so that the LCF crack propagation resistance of the former is lower than that of the latter. The low cycle fatigue crack propagation behavior of the former depends strongly on the plastic strain or the maximum stress value but that of the latter depends mainly on the von Mises stress amplitude and its distribution.
- The LCF crack initiation behavior of cast AM60B and AZ91 alloys with tilted 90° and the hole distances indicated that all fatigue crack initiation seats occurred at the edge of hole and LCF crack propagation behavior depends mainly on the distance of two holes, which the LCF crack propagates preferentially between two small through holes when the hole distance is less than λ = 2 mm (4D). Therefore, the correlative effect of the distance of about λ = 2 mm (4D) on the LCF crack propagation can be defined as the critical distance between two small holes when the diameter of hole is about 0.5 mm.
- The LCF crack initiation behavior of cast Mg-Al alloys with tilted angle α = 45° and different hole distances is similar to that of the case with tilted angle α = 90° but the crack propagation behavior depends not only on the distance of two through holes but also on the plastic deformation capability of cast AM60B and AZ91 alloys as well as the applied stress ratio λ parameter (λ = σmax/σ0.2).
- The LCF crack growth rates of the cast AZ91 and AM60B alloys are about 1.38 × 10−8 m/cycle and 0.83 × 10−8 m/cycle, respectively, under the same condition. Therefore, the fatigue life of the former is shorter (just under 2 times) than that of the latter. The results demonstrate a good correlation with S-N curves by using the longitudinal coordinates of the maximum stress amplitude or the λ parameter.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Materials | Al | Mn | Si | Zn | Cu | Mg | σ0.2 (MPa) | σb (MPa) | Δ (%) |
---|---|---|---|---|---|---|---|---|---|
AM50 | 2.50 | 0.2 | 1.20 | 0.25 | 0.080 | Bal. | 140 | 200 | 15.0 |
AM60B | 5.99 | 0.2 | 1.20 | 0.25 | 0.008 | Bal. | 150 | 160 | 10.0 |
AZ91 | 8.97 | - | 0.05 | 0.45 | 0.025 | Bal. | 160 | 240 | 3.5 |
Materials | E (GPa) | υ | Micro Hardness (MPa) | Crystal Particle Size (μm) | FE Mesh |
---|---|---|---|---|---|
α-Mg | 43 | 0.35 | 66.86 | 10 | hexagon |
β-Mg17Al12 | 58 | 0.30 | 88.34 | 15 | hexagon |
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Wang, X.-S.; Tan, C.-H.; Ma, J.; Zhu, X.-D.; Wang, Q.-Y. Influence of Multi-Holes on Fatigue Behaviors of Cast Magnesium Alloys Based on In-Situ Scanning Electron Microscope Technology. Materials 2018, 11, 1700. https://doi.org/10.3390/ma11091700
Wang X-S, Tan C-H, Ma J, Zhu X-D, Wang Q-Y. Influence of Multi-Holes on Fatigue Behaviors of Cast Magnesium Alloys Based on In-Situ Scanning Electron Microscope Technology. Materials. 2018; 11(9):1700. https://doi.org/10.3390/ma11091700
Chicago/Turabian StyleWang, Xi-Shu, Chang-Hao Tan, Juan Ma, Xiao-Dong Zhu, and Qing-Yuan Wang. 2018. "Influence of Multi-Holes on Fatigue Behaviors of Cast Magnesium Alloys Based on In-Situ Scanning Electron Microscope Technology" Materials 11, no. 9: 1700. https://doi.org/10.3390/ma11091700