Aluminium matrix tungsten aluminide and tungsten reinforced composites by solid-state diffusion mechanism

Zhang, Hanzhu; Feng, Peizhong; Akhtar, Farid

doi:10.1038/s41598-017-12302-w

Cited by 35 publications

(22 citation statements)

References 46 publications

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“…It is well known that the particle size of the precursors is an essential parameter influencing the atomic diffusion and phase evolution during solid-state sintering in PCP [15]. Fine particles promote the solid-state atomic diffusion by reducing the diffusion distance and promote the kinetics of phase transformation [21,22].…”

Section: Effect Of Different Starting Particle Sizesmentioning

confidence: 99%

“…The phase evolution on B 4 C addition was studied by investigating the microstructure and phase composition of the five-component carbides. Moreover, due to the importance of starting particle size in solid-state diffusion [15], HEC composites were fabricated from precursors with different particle sizes. The effects of tuning the particles size of the solvent and the solute carbides on the microstructure, phase composition, and mechanical properties are discussed.…”

Section: Introductionmentioning

confidence: 99%

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Processing and Characterization of Refractory Quaternary and Quinary High-Entropy Carbide Composite

Zhang

Akhtar

2019

Entropy

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Quaternary high-entropy ceramic (HEC) composite was synthesized from HfC, Mo2C, TaC, and TiC in pulsed current processing. A high-entropy solid solution that contained all principal elements along with a minor amount of a Ta-rich phase was observed in the microstructure. The high entropy phase and Ta-rich phase displayed a face-centered cubic (FCC) crystal structure with similar lattice parameters, suggesting that TaC acted as a solvent carbide during phase evolution. The addition of B4C to the quaternary carbide system induced the formation of two high-entropy solid solutions with different elemental compositions. With the increase in the number of principal elements, on the addition of B4C, the crystal structure of the HEC phase transformed from FCC to a hexagonal structure. The study on the effect of starting particle sizes on the phase composition and properties of the HEC composites showed that reducing the size of solute carbide components HfC, Mo2C, and TiC could effectively promote the interdiffusion process, resulting in a higher fraction of a hexagonal structured HEC phase in the material. On the other hand, tuning the particle size of solvent carbide, TaC, showed a negligible effect on the composition of the final product. However, reducing the TaC size from −325 mesh down to <1 µm resulted in an improvement of the nanohardness of the HEC composite from 21 GPa to 23 GPa. These findings suggested the possibility of forming a high-entropy ceramic phase despite the vast difference in the precursor crystal structures, provided a clearer understanding of the phase transformation process which could be applied for the designing of HEC materials.

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Section: Effect Of Different Starting Particle Sizesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Processing and Characterization of Refractory Quaternary and Quinary High-Entropy Carbide Composite

Zhang

Akhtar

2019

Entropy

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“…Reinforcements such as Al 2 O 3 , SiC, and TiC are common in particulate-reinforced AMCs and other MMCs. [7][8][9][10] Due to the micrometer size of the reinforcements in such composites, the machinability becomes a challenging task. [11] After the discovery of carbon nanotubes (CNTs) by Iijima, a revolution started in the field of carbon due to its excellent chemical stability and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…To further reduce the weight of structural components via enhancing the strength of Al and its alloys, several reinforcements have been added to produce Al matrix composites (AMCs). Reinforcements such as Al 2 O 3 , SiC, and TiC are common in particulate‐reinforced AMCs and other MMCs . Due to the micrometer size of the reinforcements in such composites, the machinability becomes a challenging task .…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotube‐Reinforced Aluminum Matrix Composites

Mohammed

Chen

2019

Adv Eng Mater

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Herein, the investigations conducted in the area of aluminum (Al) matrix composites reinforced with carbon nanotubes (CNTs) are presented. The application of CNT reinforcement in Al alloys is driven by its exceptional chemical and mechanical properties. The critical issues in the processing techniques, challenges in the interfacial mechanisms between the Al matrix and CNTs, and strengthening effects due to the presence of reinforcements are reviewed. The mechanical properties of CNT/Al composites are found to be effectively enhanced with an addition of CNTs even at a small amount. The extent of strength improvements depends mainly on the dispersion of CNTs in the matrix and interfacial bonding between the matrix and CNTs. Limited theoretical modeling can predict the properties of CNT/Al composites to some extent, but without considering the detailed processing parameters. Based on the gaps identified here, future research directions are suggested, including the relationships between the processing parameters and micro-and nanostructures, and multiscale mechanical modeling and simulation, aiming to further understand the strengthening mechanisms and develop advanced CNT-reinforced Al and other metal composites for critical engineering applications.

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“…For instance, the deposition process was conducted at room temperature and in argon atmosphere to ensure physical deposition or the distribution of W/Al according to the target distribution designed in example 1. Of course, W and Al can react with each other to form intermetallics when the temperature is higher than 682 °C [36]. Also, they can be oxidized to form the corresponding oxides in the atmosphere of oxygen [37,38].…”

Section: Resultsmentioning

confidence: 99%

A Universal Solution of Controlling the Distribution of Multimaterials during Macroscopic Manipulation via a Microtopography-Guided Substrate

Zhang

et al. 2018

Nanomaterials

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Any object can be considered as a spatial distribution of atoms and molecules; in this sense, we can manufacture any object as long as the precise distribution of atoms and molecules is achieved. However, the current point-by-point methods to precisely manipulate single atoms and single molecules, such as the scanning tunneling microscope (STM), have difficulty in manipulating a large quantity of materials within an acceptable time. The macroscopic manipulation techniques, such as magnetron sputtering, molecular beam epitaxy, and evaporation, could not precisely control the distribution of materials. Herein, we take a step back and present a universal method of controlling the distribution of multimaterails during macroscopic manipulation via microtopography-guided substrates. For any given target distribution of multimaterials in a plane, the complicated lateral distribution of multimaterials was firstly transformed into a simple spatial lamellar body. Then, a deposition mathematical model was first established based on a mathematical transformation. Meanwhile, the microtopographic substrate can be fabricated according to target distribution based on the deposition mathematical model. Following this, the deposition was implemented on the substrate according to the designed sequence and thickness of each material, resulting in the formation of the deposition body on the substrate. Finally, the actual distribution was obtained on a certain section in the deposition body by removing the upside materials. The actual distribution can mimic the target one with a controllable accuracy. Furthermore, two experiments were performed to validate our method. As a result, we provide a feasible and scalable solution for controlling the distribution of multimaterials, and point out the direction of improving the position accuracy of each material. We may achieve real molecular manufacturing and nano-manufacturing if the position accuracy of distribution approaches the atomic level.

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Aluminium matrix tungsten aluminide and tungsten reinforced composites by solid-state diffusion mechanism

Cited by 35 publications

References 46 publications

Processing and Characterization of Refractory Quaternary and Quinary High-Entropy Carbide Composite

Processing and Characterization of Refractory Quaternary and Quinary High-Entropy Carbide Composite

Carbon Nanotube‐Reinforced Aluminum Matrix Composites

A Universal Solution of Controlling the Distribution of Multimaterials during Macroscopic Manipulation via a Microtopography-Guided Substrate

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