Journal ArticleDOI
Improving the high-cycle fatigue strength of heterogeneous carbon nanotube/Al-Cu-Mg composites through grain size design in ductile-zones
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TLDR
In this article, two heterogeneous CNT/2009Al composites with coarse grain (CG, 2μm) DZs or ultra-fine grain (UFG, ~500 nm)DZs were fabricated and achieved enhanced strength-ductility.Abstract:
Heterogeneous structure consisting of brittle-zones (BZs) rich of carbon nanotubes (CNTs) and ductile-zones (DZs) free of CNTs, was an effective way to improve the strength-ductility of CNT reinforced Al (CNT/Al) composites. Two heterogeneous CNT/2009Al composites with coarse grain (CG, ~2 μm) DZs or ultra-fine grain (UFG, ~500 nm) DZs were fabricated and achieved enhanced strength-ductility. However, the heterogeneous composite with CG DZs had a lower high-cycle fatigue strength as well as fatigue strength/tensile strength ratio than the uniform composite, while the heterogeneous composite with UFG DZs exhibited the increased fatigue strength and the same level of fatigue strength/tensile strength ratio compared to the uniform composite. It was found that the improved fatigue properties for the heterogeneous composite with the UFG DZs could attribute to two reasons. Firstly, the UFG for the DZs significantly increased the strength of DZs, which effectively reduced the strain localization in the DZs. Secondly, the dislocations piling up at the grain boundaries of the BZs, as well as the stress concentration at the boundaries between the DZs and BZs were relieved due to the coordinated micro-strain for the heterogeneous structure. This provided a simple strategy for the structural design of heterogeneous composites with high fatigue strength.read more
Citations
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Exceptional mechanical properties of aluminum matrix composites with heterogeneous structure induced by in-situ graphene nanosheet-Cu hybrids
Bowei Pu,Xiang Zhang,Xiaofeng Chen,Xiao Hong Lin,Dongdong Zhao,Chunsheng Shi,Enzuo Liu,Junwei Sha,Chunnian He,Naiqin Zhao +9 more
TL;DR: In this paper , an innovative strategy for fabricating graphene nanosheet-Cu reinforced Al matrix (GNS-Cu/Al) composites with heterogeneous structure was proposed, which involves the consolidation of unique composite powders with core-shell grain structure.
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A novel heterogeneous network structure titanium matrix composite with a combination of strength and ductility
Yongqing Zhao,Qinyang Zhao +1 more
TL;DR: In this article , Boron and graphene oxide nanoplates (GOs) reinforced Ti6Al4V (Ti64) titanium matrix composite with a heterogeneous network structure was prepared via spark plasma sintering (SPS).
A Novel Heterogeneous Network Structure Titanium Matrix Composite with a Combination of Strength and Ductility
Journal ArticleDOI
Enhanced strength–ductility synergy of carbon nanotube/Al–Cu–Mg composites via introducing laminate structure and grain modification
TL;DR: In this paper , the strength-ductility of the composites was improved remarkably, as compared with those of uniform composites by using ultrafine grain Al as ductile layers.
Journal ArticleDOI
Effects of natural aging on precipitation behavior and hardening ability of peak artificially aged SiCp/Al-Mg-Si composites
TL;DR: In this paper , the influence of NA on precipitation behaviors and hardening abilities during AA of a SiCp/Al-Mg-Si composite and unreinforced AlMg/Si alloy was investigated using hardness, tension, differential scanning calorimetry, electron probe and transmission electron microscopy tests.
References
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Journal ArticleDOI
Mechanical properties of nanocrystalline materials
TL;DR: The mechanical properties of nanocrystalline materials are reviewed in this paper, with emphasis on their constitutive response and on the fundamental physical mechanisms, including the deviation from the Hall-Petch slope and possible negative slope, the effect of porosity, the difference between tensile and compressive strength, the limited ductility, the tendency for shear localization, fatigue and creep responses.
Journal ArticleDOI
Recent progress in the development and properties of novel metal matrix nanocomposites reinforced with carbon nanotubes and graphene nanosheets
Sie Chin Tjong,Sie Chin Tjong +1 more
TL;DR: In this article, the authors focus on the recent development in the synthesis, property characterization and application of aluminum, magnesium, and transition metal-based composites reinforced with carbon nanotubes and graphene nanosheets.
Book
Fatigue Testing and Analysis: Theory and Practice
TL;DR: In this article, stress-based fatigue analysis and design of spot welds was used to evaluate the performance of a cyclone-counting clock in the frequency domain and showed that the fatigue analysis can be applied to a number of applications.
Journal ArticleDOI
Mechanical properties of copper/bronze laminates: Role of interfaces
Xiaolong Ma,Chongxiang Huang,Jordan Moering,Mathis Ruppert,Heinz Werner Höppel,Mathias Göken,Jagdish Narayan,Yuntian Zhu,Yuntian Zhu +8 more
TL;DR: In this paper, a copper/bronze laminates with varying interface spacing were fabricated by accumulative roll bonding and subsequent annealing to systematically study the interface effect on mechanical properties.
Journal ArticleDOI
The use of flake powder metallurgy to produce carbon nanotube (CNT)/aluminum composites with a homogenous CNT distribution
TL;DR: In this paper, a strategy called flake powder metallurgy (flake PM) was used to achieve a uniform distribution of carbon nanotubes (CNTs) in CNT/Al composites and thus realize the potential of CNTs as a reinforcement.