Production of Al–20 wt.% Al2O3 composite powder using high energy milling

Razavi-Tousi, S.S.; Rad, Rahim Yazdani; Salahi, E.; Mobasherpour, Iman; Razavi, Mansour

doi:10.1016/j.powtec.2009.01.016

Cited by 126 publications

(33 citation statements)

References 25 publications

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“…At the steady state stage, Al 2 O 3 nanoparticles are uniformly dispersed and the distance between Al 2 O 3 nanoparticles is reduced; representing a tight bonding of the matrix and reinforcement at the steady state (Figure 1d). It can be inferred that the steady state can be achieved with the attainment of a full homogeneity of Al 2 O 3 nanoparticles throughout the Al matrix [14]. A low amount of the Al 2 O 3 nanoparticles can be observed because the remaining Al 2 O 3 nanoparticles are embedded in the Al particles after reaching the steady state.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Milling Time on the Microstructure, Physical and Mechanical Properties of Al-Al2O3 Nanocomposite Synthesized by Ball Milling and Powder Metallurgy

et al. 2017

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The effect of milling time on the morphology, microstructure, physical and mechanical properties of pure Al-5 wt % Al2O3 (Al-5Al2O3) has been investigated. Al-5Al2O3 nanocomposites were fabricated using ball milling in a powder metallurgy route. The increase in the milling time resulted in the homogenous dispersion of 5 wt % Al2O3 nanoparticles, the reduction of particle clustering, and the reduction of distances between the composite particles. The significant grain refining during milling was revealed which showed as a reduction of particle size resulting from longer milling time. X-Ray diffraction (XRD) analysis of the nanocomposite powders also showed that designated ball milling contributes to the crystalline refining and accumulation of internal stress due to induced severe plastic deformation of the particles. It can be argued that these morphological and microstructural variations of nanocomposite powders induced by designated ball milling time was found to contribute to an improvement in the density, densification, micro-hardness (HV), nano-hardness (HN), and Young’s modulus (E) of Al-5Al2O3 nanocomposites. HV, HN, and E values of nanocomposites were increased by ~48%, 46%, and 40%, after 12 h of milling, respectively.

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Section: Resultsmentioning

confidence: 99%

“…Ostovan et al [8] also reported the homogenous dispersion of Al 2 O 3 nanoparticles after 8 h of milling in the case of 1 wt % Al 2 O 3 . In fact, as milling proceeds, clusters of Al 2 O 3 nanoparticle disappear, Al 2 O 3 nanoparticles disappear throughout the matrix, and the distances between particles reduces [3,7,8,12,13,14]. …”

Section: Resultsmentioning

confidence: 99%

Effect of Milling Time on the Microstructure, Physical and Mechanical Properties of Al-Al2O3 Nanocomposite Synthesized by Ball Milling and Powder Metallurgy

et al. 2017

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“…The final particle size of milled powders depends on the equilibrium between fracture and cold welding mechanisms [1]. A ductile particle has a greater tendency toward cold welding rather than fracture, and there is a contrary trend for hard particles [28][29][30]. On the other hand, according to the Orowan theory [31], strength of particulate metal matrix composites increases as volume fraction of reinforcement phase increases or particle size of reinforcement phase decreases.…”

Section: Methodsmentioning

confidence: 99%

Production of Al nanocomposite reinforced by Fe–Al intermetallic, Al4C3 and nano-Al2O3 particles using wet milling in toluene

Razavi-Tousi

Yazdani-Rad

Manafi

2011

Journal of Alloys and Compounds

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“…By comparison with other processes, the high-energy ball milling (also known as mechanical milling) process has proved to be a simple and effective technique to refine particle grain size and produce ultrafine grained (100 nm-1 μm) and nanocrystalline (∼100 nm) materials for use in various domains [8][9][10]. Another advantage of highenergy ball milling lies in its ability to produce bulk quantities of solid-state materials using simple equipment at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Characterisation and milling time optimisation of nanocrystalline aluminium powder for selective laser melting

Han

Setchi

Evans

2016

Int J Adv Manuf Technol

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The aim of this study is to investigate the properties of high-energy ball-milled nanocrystalline aluminium powders and to determine the optimum milling time required to produce an advanced aluminium powder for selective laser melting (SLM). Previous research has indicated that powders suitable for SLM include milled nanocrystalline aluminium powders with an average grain size of 60 nm and good flowability (Carr index less than 15 %). This study employs advanced nanometrology methods and analytical techniques to investigate the powder morphology, phase identification, average grain size and flowability of ball-milled powders. Stearic acid is used to prevent excessive cold welding of the ball-milled powder and to reduce abrasion of the grinding bowl and balls. The results indicate that, whilst the average particle size achieves a steady state after 14 h of milling, the grain size continues to decrease as the milling time progressed (e.g. the transmission electron microscopy measured average grain size is 56 nm after 20 h of milling compared to 75 nm for 14 h of milling). The aluminium powders milled for 16 and 20 h exhibit good flow behaviour, achieving a Carr index of 13.5 and 15.8 %, respectively. This study shows that advanced nanocrystalline aluminium powders suitable for SLM require ball milling for between 16 and 20 h, with 18 h being the optimum milling time.

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Production of Al–20 wt.% Al2O3 composite powder using high energy milling

Cited by 126 publications

References 25 publications

Effect of Milling Time on the Microstructure, Physical and Mechanical Properties of Al-Al2O3 Nanocomposite Synthesized by Ball Milling and Powder Metallurgy

Effect of Milling Time on the Microstructure, Physical and Mechanical Properties of Al-Al2O3 Nanocomposite Synthesized by Ball Milling and Powder Metallurgy

Production of Al nanocomposite reinforced by Fe–Al intermetallic, Al4C3 and nano-Al2O3 particles using wet milling in toluene

Characterisation and milling time optimisation of nanocrystalline aluminium powder for selective laser melting

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