Microstructure Study on Very High Cycle Fatigue of an Additively Manufactured Aluminium Alloy via Advanced Characterization Methods
Abstract
:Featured Application
Abstract
1. Introduction
2. Material and Specimen
2.1. Additive Manufacturing Process
2.2. Anisotropic Behavior of Tensile Properties
2.3. Fatigue Specimen, Data, and Microstructure
3. Results and Discussion
3.1. Selected VHCF Specimens A and B
3.2. Typical SEM Morphology of Crack Initiation
3.3. Local Fractography along Crack Growth Path
3.4. TEM Sample Preparation by Using FIB Technique
- A rectangular platinum layer was physically vapor-deposited on the posited location to protect the selective fracture surface and the microstructure underneath guided by beams of ions and electrons via a gas injection system of the FIB/SEM microscope. The platinum layers were labeled as A1, A2, B1, and B2 in Figure 2c–f with small translucent blocks.
- On both long sides of the rectangular layer, two trenches were milled from the unprotected fracture surface with spattered Ga+ cations, and obtained a rough sample of profile microstructure which was still connected with the matrix on three planes.
- By tilting the fractured specimen, the sample was separated from the matrix with FIB etching, and attached to the tip of a nano-manipulator (OmniProbe, Oxford Instrument, Abingdon, UK).
- Lifted out the rough sample of about length 10 μm, depth 5 μm and thickness 1 μm; and then mounted on an FIB-TEM grid holder; eventually thinned and polished to a foil of about length 5 μm, depth 4 μm and thickness 50 nm.
3.5. Al cell, Si Network and Grain Boundary Distribution
3.6. VHCF-Induced Fracture and Microstructure Features
4. Conclusions
- Broadly, there are no characteristic microstructures of both grain size and chemical element distribution induced by fatigue crack initiation and growth in the differently oriented AM aluminum alloy under very high cyclic loading with various R values of stress ratios.
- A few nanograins were observed at a very local region around the crack initiation site of a vertically AM AlSi10Mg under VHCF loading at R = 0.
- The granulation of fracture surface and Si arrangement underneath the fracture surface occur in the neighboring area of VHCF crack initiation in the AM aluminum alloy with various orientations and under different R values.
- VHCF loading cycles are the first key factor dominating the behaviors of fracture surface granulation and chemical element arrangement, and the negative stress ratios are the second.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Al | Si | Mg | Fe | Ti | Other |
---|---|---|---|---|---|
Balance | 9.75 | 0.22 | 0.092 | 0.011 | <0.01 |
p [W] | t [mm] | v [mm/s] | h [mm] | Ev [J/mm3] |
---|---|---|---|---|
370 | 0.05 | 1300 | 0.19 | 30 |
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Liu, L.; Wang, S.; Li, G.; Ma, Y. Microstructure Study on Very High Cycle Fatigue of an Additively Manufactured Aluminium Alloy via Advanced Characterization Methods. Appl. Sci. 2024, 14, 2025. https://doi.org/10.3390/app14052025
Liu L, Wang S, Li G, Ma Y. Microstructure Study on Very High Cycle Fatigue of an Additively Manufactured Aluminium Alloy via Advanced Characterization Methods. Applied Sciences. 2024; 14(5):2025. https://doi.org/10.3390/app14052025
Chicago/Turabian StyleLiu, Lu, Shengnan Wang, Gang Li, and Yifan Ma. 2024. "Microstructure Study on Very High Cycle Fatigue of an Additively Manufactured Aluminium Alloy via Advanced Characterization Methods" Applied Sciences 14, no. 5: 2025. https://doi.org/10.3390/app14052025
APA StyleLiu, L., Wang, S., Li, G., & Ma, Y. (2024). Microstructure Study on Very High Cycle Fatigue of an Additively Manufactured Aluminium Alloy via Advanced Characterization Methods. Applied Sciences, 14(5), 2025. https://doi.org/10.3390/app14052025