Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms
Abstract
:1. Introduction
2. Materials and Methods
2.1. Interatomic Potential
2.2. Modeling Methods
2.2.1. Different Crystalline State Models
2.2.2. Models of Columnar Grains with Different Grain Orientations
3. Results and Discussion
3.1. Effect of Temperature on the Mechanical Properties of Aluminum with Different Crystal Structures
3.2. Mechanical Properties of Columnar Grains with Different Orientations
4. Conclusions
- (1)
- The Young’s modulus, yield strength, and tensile strength of SLM aluminum decreased with increasing temperature. The tensile strength of SLM aluminum with columnar grains at different temperatures was lower than that of single-crystal aluminum, but greater than that of aluminum with equiaxed grains.
- (2)
- The tensile strength and Young’s modulus both decreased approximately linearly with increasing temperature. The tensile strength of SLM aluminum with columnar grains was more sensitive to temperature than aluminum with equiaxed grains, but less sensitive than single-crystal aluminum. The sensitivity of the Young’s modulus of SLM aluminum with columnar grains stretched along the x-axis was the greatest, but the sensitivity of the Young’s modulus of SLM aluminum with columnar grains stretched along the z-axis was greater than that of single-crystal aluminum, but less sensitive than that of aluminum with equiaxed grains.
- (3)
- The deformation mechanisms of equiaxed and columnar grain were dislocation slip, grain boundary migration, and torsion. The deformation mechanisms of single crystals were stacking fault formation and amorphization.
- (4)
- The Young’s modulus was almost independent of the grain orientation, but the tensile strength was greatly affected by the orientation of columnar grains. Reasonable control of the grain orientation can improve the tensile strength of SLM aluminum.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Acknowledgments
Conflicts of Interest
References
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Zeng, Q.; Wang, L.; Jiang, W. Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms. Crystals 2021, 11, 1388. https://doi.org/10.3390/cryst11111388
Zeng Q, Wang L, Jiang W. Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms. Crystals. 2021; 11(11):1388. https://doi.org/10.3390/cryst11111388
Chicago/Turabian StyleZeng, Qiang, Lijuan Wang, and Wugui Jiang. 2021. "Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms" Crystals 11, no. 11: 1388. https://doi.org/10.3390/cryst11111388