Shock consolidation of nanocrystalline 6061-T6 aluminum powders

Fredenburg, David A.; Thadhani, Naresh N.; Vogler, Tracy

doi:10.1016/j.msea.2010.02.036

Cited by 35 publications

(19 citation statements)

References 32 publications

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“…The higher velocities up to 30 km/s are attainable but some limitations in the tests must be admitted. Francesconi et al [16,17] performed a theoretical and numerical investigation to increase the performance of two stage light-gas guns by altering their working conditions. Rajesh et al [18] presented a mathematical approach to study a flying projectile.…”

Section: Introductionmentioning

confidence: 99%

Performance of a Two-stages Gas Gun: Experimental, Analytical and Numerical Analysis

Majzoobi

Rahmati

Kashfi

2019

IJE

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Two stages gas guns are used for various purposes, particularly for mechanical characterization of materials at high rate of deformations. The performance of a two stages gas gun is studied in this work using the theory of the two-stage gas gun proposed by Rajesh, numerical simulation using combined Eulerian/ Lagrangian elements in Autodyna commercial code and experiment using a two stage gas gun developed by the authors of this study. Equations governing the motion of the piston and projectile are solved using Runge-Kutta method. The effects of parameters such as chamber pressure, pump tube pressure and piston mass on the performance of gun are explored. The results of numerical simulation and analytical methods are validated by experiment. Finally, a comparison between the analytical, numerical and experimental results shows that the theory proposed by Rajesh, yields reasonable predictions for the two stage gas gun performance in the first place, and Autodyn software, using combined Eulerian/ Lagrangian elements, gives accurate estimations for gas gun parameters, in the second place. A 3-D working diagram is provided for prediction of projectile velocity for any state of pump and chamber pressures which are the most important variables for a gas gun with a fixed geometry.

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Section: Introductionmentioning

confidence: 99%

Performance of a Two-stages Gas Gun: Experimental, Analytical and Numerical Analysis

Majzoobi

Rahmati

Kashfi

2019

IJE

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“…This sintering procedure may lead to grain growth and agglomeration of the particles that are detrimental to the final quality of the composites [7]. On the other hand, in dynamic compaction techniques such as shock wave consolidation [1,8,9] and high velocity compaction (HVC) [10][11][12][13][14] the sample is not exposed to a longtime sintering temperature and hence, the mentioned defects can be prevented. These processes offer adequate high temperatures for local metallurgical bonding at the powder particle interfaces while the powder remains relatively cool elsewhere [7,15].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of tensile strength of Al7075-SiC nanocomposite compacted by gas gun using spherical indentation test and neural networks

Atrian

Majzoobi

Nourbakhsh

et al. 2016

Advanced Powder Technology

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“…Bulk nc materials are normally prepared by the consolidation of nanosize powders [6][7][8]. Commonly used consolidation methods for forming bulk materials from fine powders are hot isostatic pressing and spark plasma sintering.…”

Section: Introductionmentioning

confidence: 99%

“…Because these processes can result in temperatures of as high as ≈ 0.7 Tm (melting point) and can lead to grain growth, these processes are not suitable for the consolidation of nanosize powders. On the other hand, the mechanisms of shock consolidation are significantly different from that of conventional powder processing techniques [6][7][8]. Because critical processes occur during shock loading, which have the duration of microseconds, shock compaction can overcome the shortcomings of conventional processing methods, and produce fully nanocrystalline bulk materials.…”

Section: Introductionmentioning

confidence: 99%

Characterization of shock-loaded nanocrystalline silicon powder

Kishimura¹,

Matsumoto²

2012

AIP Conference Proceedings

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Abstract. The shock compaction of nanocrystalline silicon (nc-Si) powder with an average crystallite size of 50 nm was carried out at pressures of 1-4 GPa with several initial packing densities. The bulk of the shock-compacted nc-Si powder is characterized by X-ray diffraction analysis (XRD), Raman spectroscopy, and scanning electron microscopy (SEM). The observed XRD and Raman peaks correspond to silicon with a diamond structure, which is the same structure as the starting powder. With increasing pressure, the crystallite size of the compacts increases at a shock pressure of 1.8 GPa. The Raman peak width decreases with increasing shock pressure and also depends on the nature of the sample surface. The Raman peak width from a lustrous surface, which is also subjected to SEM observation, is wider than that of a textured surface. The SEM observation reveals that the textured surface contains droplet structures. It is suggested that a shock-induced temperature rise occurs during shock compaction and results in the melting and coarsening of nc-Si grains and the formation of droplet structures.

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Shock consolidation of nanocrystalline 6061-T6 aluminum powders

Cited by 35 publications

References 32 publications

Performance of a Two-stages Gas Gun: Experimental, Analytical and Numerical Analysis

Performance of a Two-stages Gas Gun: Experimental, Analytical and Numerical Analysis

Evaluation of tensile strength of Al7075-SiC nanocomposite compacted by gas gun using spherical indentation test and neural networks

Characterization of shock-loaded nanocrystalline silicon powder

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