Deformation Mechanisms Dominated by Decomposition of an Interfacial Misfit Dislocation Network in Ni/Ni3Al Multilayer Structures
Abstract
:1. Introduction
2. Numerical Models and Methodology
2.1. Ni/Ni3Al Heterogeneous Interface Models
2.2. Molecular Dynamics Simulation
3. Results
3.1. Ni/Ni3Al (100) Interface
3.2. Ni/Ni3Al (110) Interface
3.3. Ni/Ni3Al (111) Interface
3.4. Effects of Layer Thickness for Ni/Ni3Al Multilayer Structure
4. Discussion
5. Conclusions
- Whether the Ni/Ni3Al (100) interfacial configuration is tensibly loaded along the [100] or [010] orientation, it encounters the same 1/2<110> → 1/6<112> + 1/6<112> + 1/6<110> dislocation decomposition reaction. However, dislocations evolve in the Ni and Ni3Al layers for the two orientations, respectively;
- As tensile loading is along the [110] orientation, decomposition of the Ni/Ni3Al (110) IMD network initiates from the propagation of 1/6<112> Shockley dislocations and stacking faults behind them. This causes the yielding of the Ni/Ni3Al (110) multilayer structure in advance in contrast to the case of loading, which is along the [10] orientation. The 1/2<110> perfect dislocations always remain stable, showing an insensitivity to loading orientations;
- The decomposition of the Ni/Ni3Al (111) IMD network is derived from the generation of new 1/6<112> Shockley dislocations at its triangular corners. The newly formed 1/6<112> Shockley dislocations extend into both Ni and Ni3Al layers;
- It is expected that these findings can provide new insights into a deep understanding of the evolution of IMD networks dominated deformation mechanism of Ni/Ni3Al heterogeneous multilayer structures and benefit their wide applications in the aerospace industry.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Zhang, Z.; Zhang, X.; Yang, R.; Wang, J.; Lu, C. Deformation Mechanisms Dominated by Decomposition of an Interfacial Misfit Dislocation Network in Ni/Ni3Al Multilayer Structures. Materials 2024, 17, 4006. https://doi.org/10.3390/ma17164006
Zhang Z, Zhang X, Yang R, Wang J, Lu C. Deformation Mechanisms Dominated by Decomposition of an Interfacial Misfit Dislocation Network in Ni/Ni3Al Multilayer Structures. Materials. 2024; 17(16):4006. https://doi.org/10.3390/ma17164006
Chicago/Turabian StyleZhang, Zhiwei, Xingyi Zhang, Rong Yang, Jun Wang, and Chunsheng Lu. 2024. "Deformation Mechanisms Dominated by Decomposition of an Interfacial Misfit Dislocation Network in Ni/Ni3Al Multilayer Structures" Materials 17, no. 16: 4006. https://doi.org/10.3390/ma17164006