Shape effects on nanoparticle engulfment for metal matrix nanocomposites

Ozsoy, Istemi B.; Li, Gang; Choi, Hongseok; Zhao, Huijuan

doi:10.1016/j.jcrysgro.2015.04.025

Cited by 24 publications

(9 citation statements)

References 45 publications

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“…During solidification, the nucleation and growth of primary α-Al dendrites pushes the fine ZrO 2 nanomaterials continuously ahead of the solid-liquid interface due to a negative Hamaker constant between ZrO 2 nanomaterials and α-Al. For a nanomaterials–liquid–solid system, the Hamaker constant for system can be given as follows [ 32 ]:

where

and

are the Hamaker constant for α-Al (

= 333 ZJ), liquid Al melt (

= 266 ZJ), and ZrO 2 (

= 200 ZJ), respectively [ 32 , 33 ]. For the Al-ZrO 2 nanocomposite system, the Hamaker constant calculated from Equation 3 is –4.2026 resulting in continuous pushing of the nanomaterials ahead of the solidification front.…”

Section: Resultsmentioning

confidence: 99%

Effect of ZrO2 Nanomaterials on Wettability and Interfacial Characteristics of Al-19Cu-11Si-2Sn Filler Metal for Low Temperature Al to Cu Dissimilar Brazing

2018

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Dissimilar Al 3003 and Cu tubular components were successfully brazed without interface cracking using ZrO2 nanomaterials reinforced with Al-19Cu-11Si-2Sn filler. The filler was initially cast using an induction furnace and processed into ring form for brazing. Al-19Cu-11Si-2Sn filler with coarse CuAl2 and Si phases (43 and 20 μm) were refined to 8 and 4 μm, respectively, after the addition of 0.1 wt. % ZrO2 and shows significant improvement in the mechanical properties. ZrO2 nanomaterials’ induced diffusion controlled growth mechanism is found be the responsible for the refinement of CuAl2 intermetallic and Si particles. The wettability of Al-19Cu-11Si-2Sn-0.1ZrO2 increased to 78.17% on Cu side and 93.19% on the Al side compared from 74.8% and 89.9%, respectively. Increase in the yield strength, ultimate tensile strength, and percentage elongation were noted for the brazed joints. Microstructure of induction brazed joint with 40 kW for 6 seconds using Al-19Cu-11Si-2Sn-0.1ZrO2 filler shows thin interfacial CuAl2 intermetallic compound along the copper side and inter-diffusion region along the aluminum side and their respective mechanism is discussed. The tensile strength of the joints increased with increasing the nanomaterials addition and shows a base metal fracture. Analysis of fractured samples shows the effectiveness of ZrO2 reinforced filler in crack propagation through the filler.

show abstract

where

and

are the Hamaker constant for α-Al (

= 333 ZJ), liquid Al melt (

= 266 ZJ), and ZrO 2 (

Section: Resultsmentioning

confidence: 99%

Effect of ZrO2 Nanomaterials on Wettability and Interfacial Characteristics of Al-19Cu-11Si-2Sn Filler Metal for Low Temperature Al to Cu Dissimilar Brazing

2018

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“…In addition, friction stir processing [14,15], numerical modeling [16,17] and discontinuous ultrasonic treatment [18] were attempted for enhanced distributions of nanoparticles in material matrix. The interaction between nanoparticles and the solidification front was also investigated [19][20][21]. SiC np , Al 2 O 3np , AlN np , TiCN np , CNT and graphene are the common reinforcements in Al matrix nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Al2O3/SiC/Al Hybrid Nanocomposites Through Solidification Process for Improved Mechanical Properties

Jiang

2018

Metals

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To reduce the cost of nanocomposites and improve the dispersion of nanoparticles, Al2O3np/SiCnp/Al hybrid nanocomposites are fabricated by combining liquid-state blowing and ultrasonic-assisted casting. The average grain size of the matrix decreases to 39 μm in Al2O3np/SiCnp/Al, which shows improvements of approximately 118% and 26% as compared to those of Al2O3np/Al and SiCnp/Al, respectively. X-ray Diffractometer (XRD) results confirm the presence of SiCnp and Al2O3np in hybrid nanocomposites. The dispersed SiCnp and Al2O3np are homogeneously distributed in the matrix and no clusters consisting of SiCnp and Al2O3np exist in the microstructure. Theoretical analyses also verify that there is little possibility for clusters to form in the melt. Good bonding between nanoparticles and Al is demonstrated. Neither cavities nor reaction products exist at the interface. The ductility and the strength of Al2O3np/SiCnp/Al are improved. The improvement in yield strength of Al2O3np/SiCnp/Al, in comparison with that of A356, is about 45%.

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“…The phase composition, size and shape of the particles [ 10 ], their concentration, uniformity of distribution within the volume of the matrix, and the nature of interaction of the nanomodifiers with the matrix, all affect the properties of the composite. Depending on the purpose of the material, hard (SiC, WC, Al 2 O 3 , TiC, etc.)…”

Section: Introductionmentioning

confidence: 99%

Nanocomposites for Machining Tools

et al. 2017

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Machining tools are used in many areas of production. To a considerable extent, the performance characteristics of the tools determine the quality and cost of obtained products. The main materials used for producing machining tools are steel, cemented carbides, ceramics and superhard materials. A promising way to improve the performance characteristics of these materials is to design new nanocomposites based on them. The application of micromechanical modeling during the elaboration of composite materials for machining tools can reduce the financial and time costs for development of new tools, with enhanced performance. This article reviews the main groups of nanocomposites for machining tools and their performance.

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Shape effects on nanoparticle engulfment for metal matrix nanocomposites

Cited by 24 publications

References 45 publications

Effect of ZrO2 Nanomaterials on Wettability and Interfacial Characteristics of Al-19Cu-11Si-2Sn Filler Metal for Low Temperature Al to Cu Dissimilar Brazing

Effect of ZrO2 Nanomaterials on Wettability and Interfacial Characteristics of Al-19Cu-11Si-2Sn Filler Metal for Low Temperature Al to Cu Dissimilar Brazing

Fabrication of Al2O3/SiC/Al Hybrid Nanocomposites Through Solidification Process for Improved Mechanical Properties

Nanocomposites for Machining Tools

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