Mechanically alloyed nanocomposites

Suryanarayana, C.; Al-Aqeeli, N.

doi:10.1016/j.pmatsci.2012.10.001

Cited by 685 publications

(295 citation statements)

References 366 publications

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“…The powders are inserted into a canister and heated to an appropriate temperature, and processed using a particular ECAE processing route to fully consolidate the powder material. review of some of these different systems can be found in Suryanarayan 31,73 and the references therein.…”

Section: Copper Intermetallics and Compositesmentioning

confidence: 99%

“…The nanostructured composite materials exhibit a higher yield strength and stiffness than the metallic matrix material, while also exhibiting more plasticity than the ceramic phase alone. In terms of particle reinforcement in copperbased nanocomposites, a number of system have been examined: 73 copper with Al 2 O 3 , B 4 C, nanodiamond, Fe 3 C, FeS, HfC, MnO, NbC, SiO 2 , TaC, and TiC reinforcements. In some cases, even copper with carbon nanotubes are reported to have high strength and good ductility.…”

Section: Copper Intermetallics and Compositesmentioning

confidence: 99%

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“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Tschopp

Murdoch

Kecskes

et al. 2014

JOM

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It is a new beginning for innovative fundamental and applied science in nanocrystalline materials. Many of the processing and consolidation challenges that have haunted nanocrystalline materials are now more fully understood, opening the doors for bulk nanocrystalline materials and parts to be produced. While challenges remain, recent advances in experimental, computational, and theoretical capability have allowed for bulk specimens that have heretofore been pursued only on a limited basis. This article discusses the methodology for synthesis and consolidation of bulk nanocrystalline materials using mechanical alloying, the alloy development and synthesis process for stabilizing these materials at elevated temperatures, and the physical and mechanical properties of nanocrystalline materials with a focus throughout on nanocrystalline copper and a nanocrystalline Cu-Ta system, consolidated via equal channel angular extrusion, with properties rivaling that of nanocrystalline pure Ta. Moreover, modeling and simulation approaches as well as experimental results for grain growth, grain boundary processes, and deformation mechanisms in nanocrystalline copper are briefly reviewed and discussed. Integrating experiments and computational materials science for synthesizing bulk nanocrystalline materials can bring about the next generation of ultrahigh strength materials for defense and energy applications.

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Section: Copper Intermetallics and Compositesmentioning

confidence: 99%

Section: Copper Intermetallics and Compositesmentioning

confidence: 99%

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Tschopp

Murdoch

Kecskes

et al. 2014

JOM

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“…where 1 : n I I is the total of relative intensities of characteristic peaks of FAp for both the synthesized powders and standard. Figure 8 displays the crystallinity degree of the milled samples before and after thermal treatment at 700 ℃.…”

Section: Crystallinity Degreementioning

confidence: 99%

“…One of the most important aspects of nanotechnology is the modification and design of solids to obtain functionalized materials with tailored properties [1]. In the field of biomaterials, hydroxyapatite (HAp, Ca 10 (PO 4 ) 6 (OH) 2 ) is one of the most frequent forms of bioceramics in biological organisms which shows excellent biocompatibility with various kinds of cells and tissues [2].…”

Section: Introductionmentioning

confidence: 99%

Thermal treatment effect on structural features of mechano-synthesized fluorapatite-titania nanocomposite: A comparative study

Nasiri–Tabrizi

2014

J Adv Ceram

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Abstract:The influence of thermal treatment on the structural features of mechano-synthesized fluorapatite-titania composite nanopowders was studied. A mixture of calcium and phosphate reagents was mixed with a certain amount of titania (20 wt%) and then was mechanically activated for 5 h, 10 h and 15 h respectively. After that, the mechano-synthesized powders were annealed at 700 ℃ for 2 h. The crystallite size of the composite nanopowders estimated from Williamson-Hall method was in good agreement with transmission electron microscopy (TEM) analysis. Scanning electron microscopy (SEM)/TEM images confirmed the formation of a cluster-like composite which was composed of ellipse-like nanoparticles with an average size of about 16±7 nm after 15 h of milling. During the milling process, large variations in mechanochemical behavior of the CaHPO 4 -Ca(OH) 2 -CaF 2 -TiO 2 system were detected. After the beginning of milling, no trace of the composite was found due to the lack of sufficient time for the mechanical activation. When the mechanical activation time increased to 15 h, composite nanopowders with the crystallite size of around 21.66 nm were formed. During heating at 700 ℃, the recovery of crystallinity occurred and the fraction of crystalline phase reached a maximum around 88.79% for the 10-h milled sample. Results indicated that the structural features of the composite were strongly influenced by the subsequent annealing.

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“…The former is achieved by reducing the excess grain boundary energy 15 while the latter is achieved by reducing the grain boundary mobility. 16 The effect of these two mechanisms can be summarized by Eq. 1:…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Stability and Grain Boundary Complexion Formation in a Nanocrystalline Cu-Zr Alloy

Khalajhedayati

Rupert

2015

JOM

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Nanocrystalline Cu-3 at.% Zr powders with ~20 nm average grain size were created with mechanical alloying and their thermal stability was studied from 550-950 °C. Annealing drove Zr segregation to the grain boundaries, which led to the formation of amorphous intergranular complexions at higher temperatures. Grain growth was retarded significantly, with 1 week of annealing at 950 °C, or 98% of the solidus temperature, only leading to coarsening of the average grain size to 54 nm. The enhanced thermal stability can be connected to both a reduction in grain boundary energy with doping as well as the precipitation of ZrC particles. High mechanical strength is retained even after these aggressive heat treatments, showing that complexion engineering may be a viable path toward the fabrication of bulk nanostructured materials with excellent properties.2

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Mechanically alloyed nanocomposites

Cited by 685 publications

References 366 publications

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Thermal treatment effect on structural features of mechano-synthesized fluorapatite-titania nanocomposite: A comparative study

High-Temperature Stability and Grain Boundary Complexion Formation in a Nanocrystalline Cu-Zr Alloy

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