Nanostructured Metals with an Excellent Synergy of Strength and Ductility: A Review
Abstract
:1. Introduction
2. The Bimodal Nanostructure
2.1. Original Intention
2.2. Preparation Methods
2.2.1. Thermomechanical Processing Route
2.2.2. Powder Metallurgy
2.2.3. Electrodeposition Technique
2.3. Strengthening and Toughening Mechanisms
2.4. Summary and Prospect
- (1)
- The “reproducibility” of such structures is not ideal by using the existing preparation methods. The most commonly used methods, such as the thermomechanical processing route and the powder metallurgy, make it difficult to accurately control the grain size, grain morphology, and spatial distribution of the two constituents, due to the inhomogeneity of plastic deformation during plastic processing or ball milling and the temperature nonuniformity during annealing or consolidation [52,58]. These make bimodal nanostructures not so “reproducible” that overall deformation process can be accurately predicted and modeled.
- (2)
- The influences and corresponding mechanisms of microstructure parameters on the mechanical properties are not completely understood. Although previous studies have analyzed the effect of volume fraction of the coarse-grained regions on ductility of Al–7.5Mg alloy, Fe, and 5083 Al [38,39,40], those of the other microstructure parameters, such as the grain sizes, mechanical behaviors, spatial distributions, and more detailed volume–fraction ratio of the two constituents, and the optimum parameters have not been comprehensively clarified. The main reason is that the ideal microstructure cannot be achieved due to the limitations of the processing techniques mentioned above.
- (3)
- The trade-off between strength and ductility still exists sometimes. As for the bimodal structured austenitic steel [20] and Al–Mg alloy [38] prepared using thermomechanical processing and powder metallurgy method, respectively, they showed an increase in strength but a decrease in ductility compared to the corresponding coarse-grained counterparts, which are different from the currently recognized strengthening and toughening mechanisms and need to be further clarified.
3. The Nanotwinned Structure
3.1. Design Concept
3.2. The Single-Order NT Structure
3.2.1. Preparation of Nanotwins
- (1)
- DPD method
- (2)
- PVD method
- (3)
- Electrodeposition method
3.2.2. Strengthening and Toughening Mechanisms
- (1)
- Effect of twin orientation on deformation mechanisms
- (2)
- Effect of λ on strengthening and toughening mechanisms
3.3. HNT Structure
3.3.1. The Preparation of the HNT Structure
3.3.2. Strengthening and Toughening Mechanisms
3.4. Summary and Prospect
4. Gradient Nanostructure
4.1. Gradient Plastic Deformation
- (1)
- GNG structure
- (2)
- GNT structure
4.2. Physical/Chemical Deposition Method
- (1)
- GNG structure
- (2)
- GNT structure
4.3. Strengthening and Toughening Mechanisms
4.3.1. Plastic Strain Gradient
4.3.2. Geometrically Necessary Dislocations
4.3.3. The Relationship between GNDs and the Work-Hardening Rate
4.4. Summary and Prospect
- (1)
- Controllable preparation technologies. At present, the preparation of gradient-nanostructured metals is still dominated by gradient plastic deformation, which can only construct a gradient-nanostructured thin layer on a metal surface, and the volume fraction of gradient structure is very limited, generally 20–25% of the whole sample. More importantly, it is also difficult to accurately control the structure constituents, such as the size and distribution of structure constituents, to achieve the desired microstructure. Meanwhile, similar to the DPD method, the obtained structure is not “clean” and contains high-density dislocations. In contrast, the deposition method can achieve gradient structure distribution by varying the process parameters; similar to the PVD method, the obtained samples have a “clean” microstructure and can fabricate metals with gradient structure from the surface to the interior. However, it is also difficult to realize the engineering application. It can be seen that the development of preparation techniques that can produce gradient structure with higher volume fraction and can accurately control the structure constituents is the focus of the next step in the development of gradient nanostructures, and how to obtain samples with low initial dislocation density is also a problem that needs to be solved.
- (2)
- The relationship between structure and mechanical properties. This relationship is mostly qualitative because the structural gradient from nanometer to macroscopic cannot be precisely controlled during the preparation process, and thus the optimization of the gradient nanostructure is also empirical. This relationship essentially includes the quantitative relationship between strain gradient and GNDs, the specific relationship between GNDs and mobile dislocations, the relationship between the density of GNDs and mechanical properties, etc. Therefore, to understand the relationship between structure and mechanical properties, these relationships need to be clarified. Moreover, coupling of different structures to further improve the mechanical properties of nanostructured metals is only achieved in the GNT structure currently. Hence, how to couple different strengthening and toughening structures to produce nanostructured metals with better mechanical properties is also a scientific issue worthy of further discussion. Due to the limitations of controllable preparation technology, the development of reliable and accurate theoretical models and calculation methods to describe and predict the mechanical properties of metals coupled with different gradient microstructures, and to effectively guide experimental investigation by optimizing the design of microstructures, will be another focus of theoretical research on nanostructured metals.
5. Supra-Nano-Dual-Phase Nanostructure
5.1. Design Concept
5.2. Research Progress
5.3. Summary and Prospect
6. Conclusions
- (1)
- Structure design based on strengthening and toughening mechanisms
- (2)
- Preparation techniques based on the desired structure
- (3)
- Research methods for strengthening and toughening mechanisms
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Abbreviations
NT | Nanotwinned |
TBs | Twin boundaries |
SNDP | Supra-nano-dual-phase |
GBs | Grain boundaries |
SPD | Severe plastic deformation |
YS | Yield strength |
UTS | Ultimate tensile strength |
SS | Stainless steel |
TEM | Transmission electron microscopy |
EBSD | Electron backscatter diffraction |
IPF | Inverse pole figure |
DBs | Deformation bands |
FGs | Fine grains |
GNDs | Geometrically necessary dislocations |
HNT | Hierarchical nanotwinned |
SFE | Stacking fault energy |
DPD | Dynamic plastic deformation |
PVD | Physical vapor deposition |
SF | Stacking fault |
λ | Twin thickness |
SAED | Selected area electron diffraction |
SEM | Scanning electron microscopy |
SRX | Static recrystallization grains |
STEM-HAADF | Scanning transmission electron microscope-high angle annular dark field |
NG | Nanograins |
DS | Dislocation structures |
HRTEM | High-resolution TEM |
MD | Molecular dynamics |
TWIP | Twinning-induced plasticity |
SMAT | Surface mechanical attrition treatment |
λ1 | Primary twin spacings |
λ2 | Secondary twin spacing |
GNG | Gradient-nanograined |
GNT | Gradient-nanotwinned |
SMGT | Surface mechanical grinding treatment |
SMRT | Surface mechanical rolling technique |
IF | Interstitial free |
SNC | Supra-nanocrystal |
SMG | Supra-nano metallic glass |
GGIs | Glass–glass interfaces |
FFT | Fast Fourier transform |
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Pu, P.; Chen, T. Nanostructured Metals with an Excellent Synergy of Strength and Ductility: A Review. Materials 2022, 15, 6617. https://doi.org/10.3390/ma15196617
Pu P, Chen T. Nanostructured Metals with an Excellent Synergy of Strength and Ductility: A Review. Materials. 2022; 15(19):6617. https://doi.org/10.3390/ma15196617
Chicago/Turabian StylePu, Pengpeng, and Tijun Chen. 2022. "Nanostructured Metals with an Excellent Synergy of Strength and Ductility: A Review" Materials 15, no. 19: 6617. https://doi.org/10.3390/ma15196617