Achieving prominent strengthening efficiency of graphene nanosheets in Al matrix composites by hybrid deformation
TL;DR: In this paper, the authors report the prominent strengthening efficiency in graphene nanosheet reinforced Al matrix composites fabricated via hybrid deformation combining hot extrusion and multi-pass hot rolling (MPHR).
About: This article is published in Carbon.The article was published on 2021-10-15. It has received 19 citations till now. The article focuses on the topics: Recrystallization (geology).
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01 Apr 2022
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.
Abstract: Designing heterogeneous structures is a promising pathway for overcoming the trade-off between strength and toughness in metal matrix composites (MMCs). Herein, we report an innovative strategy for fabricating graphene nanosheet-Cu reinforced Al matrix (GNS-Cu/Al) composites with heterogeneous structure. This strategy involves the consolidation of unique composite powders with core-shell grain structure, which are synthesized with the aid of in-situ GNS-Cu hybrids. Results reveal that the fabricated GNS-Cu/Al composite exhibits multiple microstructural heterogeneities, including both heterogeneous grain structure and reinforcement spatial distribution, which endow the composite with a prominent combination of tensile strength of ∼437 MPa, fracture elongation of ∼12.5% and toughness of ∼48.7 MJ m−3. It is confirmed that such microstructural heterogeneities in GNS-Cu/Al composite contribute significant hetero-deformation induced (HDI) stress strengthening and sustained strain hardening, making the key mechanical properties of GNS-Cu/Al considerably outperform the counterpart of Cu/Al composite. Moreover, the coordinated deformation and crack bridging/blunting behaviors are demonstrated to be responsible for the exceptional toughness of GNS-Cu/Al composite. This work offers a promising bottom-up tactic to fabricate Al matrix composites with heterogeneous structures and superior mechanical performances for structural applications.
19 citations
TL;DR: In this article , a high-quality graphene/Ni self-lubricating composite was reported by in situ powder metallurgy process, where the microstructure and tribological behaviours of the composites with different graphene content were elaborated.
8 citations
TL;DR: In this paper , the dynamic recrystallization (DRX) mechanisms of α-Al grains were explored through high-resolution transmission electron microscopes (HRTEM) through electron backscatter diffraction (EBSD) technology.
7 citations
TL;DR: In this paper , the authors proposed a novel strategy to achieve the prominent strength-ductility combination of nanocarbon-Al composites by longitudinally unfolding the multi-walled carbon nanotubes (CNTs) into graphene nanoribbons (GNRs).
5 citations
TL;DR: In this paper , a review of recent researches and scientific issues faced in nano/micro-scale numerical simulation of metal/oxide interfaces, as well as microstructure-related microscopic analysis is provided.
Abstract: The structure and properties of metal/oxide interfaces are key to obtain metal matrix composites with both favorable mechanical and functional properties. However, some extent of differences in structure and properties between metal and oxide are pervasive. In order to obtain metal/oxide interfaces with promising mechanical, thermal, and electrical properties, it is necessary to deeply understand interfacial interaction and bonding mechanisms, and to fully utilize the advantages of numerical simulation. This paper reviews recent researches and scientific issues faced in nano/micro-scale numerical simulation of metal/oxide interfaces, as well as microstructure-related microscopic analysis. It highlights interfacial interaction and bonding mechanisms at atomic and electronic levels, along with the effects of defects and physicochemical behaviors on interfacial microstructures and properties. In this way, a reference for obtaining excellent mechanical and functional properties of metal/oxide interfaces, as well as a combination of numerical simulation and microstructure-related microscopic analysis is provided.
4 citations
References
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TL;DR: Graphene is established as the strongest material ever measured, and atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.
Abstract: We measured the elastic properties and intrinsic breaking strength of free-standing monolayer graphene membranes by nanoindentation in an atomic force microscope. The force-displacement behavior is interpreted within a framework of nonlinear elastic stress-strain response, and yields second- and third-order elastic stiffnesses of 340 newtons per meter (N m(-1)) and -690 Nm(-1), respectively. The breaking strength is 42 N m(-1) and represents the intrinsic strength of a defect-free sheet. These quantities correspond to a Young's modulus of E = 1.0 terapascals, third-order elastic stiffness of D = -2.0 terapascals, and intrinsic strength of sigma(int) = 130 gigapascals for bulk graphite. These experiments establish graphene as the strongest material ever measured, and show that atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.
18,008 citations
TL;DR: This work focuses on the interplay between the mechanisms that individually contribute to strength and toughness, noting that these phenomena can originate from very different lengthscales in a material's structural architecture.
Abstract: The attainment of both strength and toughness is a vital requirement for most structural materials; unfortunately these properties are generally mutually exclusive. Although the quest continues for stronger and harder materials, these have little to no use as bulk structural materials without appropriate fracture resistance. It is the lower-strength, and hence higher-toughness, materials that find use for most safety-critical applications where premature or, worse still, catastrophic fracture is unacceptable. For these reasons, the development of strong and tough (damage-tolerant) materials has traditionally been an exercise in compromise between hardness versus ductility. Drawing examples from metallic glasses, natural and biological materials, and structural and biomimetic ceramics, we examine some of the newer strategies in dealing with this conflict. Specifically, we focus on the interplay between the mechanisms that individually contribute to strength and toughness, noting that these phenomena can originate from very different lengthscales in a material's structural architecture. We show how these new and natural materials can defeat the conflict of strength versus toughness and achieve unprecedented levels of damage tolerance within their respective material classes.
2,350 citations
TL;DR: A detailed analysis of the Raman spectra of graphene containing different type of defects is presented, finding that the intensity ratio of the D and D' peak is maximum for sp(3)-defects, it decreases for vacancy-like defects, and it reaches a minimum for boundaries in graphite.
Abstract: Raman spectroscopy is able to probe disorder in graphene through defect-activated peaks. It is of great interest to link these features to the nature of disorder. Here we present a detailed analysis of the Raman spectra of graphene containing different type of defects. We found that the intensity ratio of the D and D′ peak is maximum (∼13) for sp3-defects, it decreases for vacancy-like defects (∼7), and it reaches a minimum for boundaries in graphite (∼3.5). This makes Raman Spectroscopy a powerful tool to fully characterize graphene.
1,716 citations
TL;DR: In this paper, a review summarises the research work carried out in the field of carbon nanotube (CNT) metal matrix composites (MMCs), focusing on the critical issues of CNT-reinforced MMCs that include processing techniques, nanotubes dispersion, interface, strengthening mechanisms and mechanical properties.
Abstract: This review summarises the research work carried out in the field of carbon nanotube (CNT) metal matrix composites (MMCs). Much research has been undertaken in utilising CNTs as reinforcement for composite material. However, CNT-reinforced MMCs have received the least attention. These composites are being projected for use in structural applications for their high specific strength as well as functional materials for their exciting thermal and electrical characteristics. The present review focuses on the critical issues of CNT-reinforced MMCs that include processing techniques, nanotube dispersion, interface, strengthening mechanisms and mechanical properties. Processing techniques used for synthesis of the composites have been critically reviewed with an objective to achieve homogeneous distribution of carbon nanotubes in the matrix. The mechanical property improvements achieved by addition of CNTs in various metal matrix systems are summarised. The factors determining strengthening achieved by CNT reinforcement are elucidated as are the structural and chemical stability of CNTs in different metal matrixes and the importance of the CNT/metal interface has been reviewed. The importance of CNT dispersion and its quantification is highlighted. Carbon nanotube reinforced MMCs as functional materials are summarised. Future work that needs attention is addressed.
1,265 citations
TL;DR: The dynamic recrystallization (DRX) phenomena occurring in different thermo-mechanical processing (TMP) conditions for various metallic materials are reviewed in this article.
1,177 citations