Formation of nano quasicrystalline and crystalline phases by mechanical alloying

Shamah, A. M.; Ibrahim, Samir; Hanna, F.F.

doi:10.1016/j.jallcom.2010.11.001

Cited by 16 publications

(5 citation statements)

References 37 publications

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“…more than 800 h without corrosion) 4 In addition, Cr-Al intermetallic compounds (IMCs) such as Cr 2 Al and Cr 5 Al 8 act as reservoir phases of Cr and Al, and hence contribute toward protective scale formation. 5 Various methods have been proposed for preparing Cr-Al IMCs, including levitation induction melting, 6 mechanical alloying, 7 mechanically activated annealing, 8 laser surface alloying, 9 and vacuum fusing. 10 Nanoscale multilayer films have attracted significant interest due to their many favorable mechanical, structural, optical and electronic properties.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, phase transformation and hardness of nanometric Cr-Al multilayer coatings

Cheng

Mayer

et al. 2015

Advances in Mechanical Engineering

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Nanometric Cr-Al multilayer films are deposited by magnetron sputtering to investigate the influences of composition and annealing on the microstructure, phase transformation, and hardness. The enhancement of hardness of as-deposited coatings is attributed to solid solution strengthening and grain size strengthening. For the Cr 1002x Al x coatings with x = 30 at.% and x = 62 at.%, respectively, the annealing process prompts the formation of Cr 2 Al and Cr 5 Al 8 intermetallic compounds. The enhancement of hardness of annealed coatings is primarily caused by the intermetallic formation and secondarily by oxide layer formation.

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Section: Introductionmentioning

confidence: 99%

Microstructure, phase transformation and hardness of nanometric Cr-Al multilayer coatings

Cheng

Mayer

et al. 2015

Advances in Mechanical Engineering

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“…Several reports have been published on the formation of icosahedral QC phase by MM/MA subsequently annealing in Al-Cu-Fe system [160][161][162][163][164][165][166][167][168][169]. These alloys in the MA state contain a β(CsCl_type) solid solution along with icosahedral phase [170].…”

Section: Icosahedral Phasementioning

confidence: 99%

“…The ratio of Al to (Cu+Fe) is suggested to play the most important role in the formation of the icosahedral phase during MA in Al-Cu-Fe alloys. However, the ordering of the icosahedral structure into the face-centered type structure is observed only after heat treatment of Al 70 Cu 20 Fe 10 powders milled for 30 and 40 h [168]. Kim et al have noticed icosahedral phase development after only 10 h of milling [172].…”

Section: Icosahedral Phasementioning

confidence: 99%

“…In some cases additional alloying by a fourth element has been shown to be beneficial for icosahedral phase formation. Recently, synthesis MA Al 70 Cu 20 Fe 10 icosahedral phase have been investigated by differential thermal analysis and they shown that the short-time milled powders consisting of a series of exothermic effects around 300-500℃, correspond to the formation of crystalline phases [168]. However, the longtime milled powders have not shown any exothermic peak.…”

Section: Icosahedral Phasementioning

confidence: 99%

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Mechanical Milling: a Top Down Approach for the Synthesis of Nanomaterials and Nanocomposites

Yadav¹,

Yadav²,

Singh³

2012

531

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Synthesis of nanomaterials by a simple, low cost and in high yield has been a great challenge since the very early development of nanoscience. Various bottom and top down approaches have been developed so far, for the commercial production of nanomaterials. Among all top down approaches, high energy ball milling, has been widely exploited for the synthesis of various nanomaterials, nanograins, nanoalloy, nanocomposites and nano -quasicrystalline materials. Mechanical alloying techniques have been utilized to produce amorphous and nanocrystalline alloys as well as metal/non-metal nanocomposite materials by milling and post annealing, of elemental or compound powders in an inert atmosphere. Mechanical alloying is a non-equilibrium processing technique in which different elemental powders are milled in an inert atmosphere to create one mixed powder with the same composition as the constituents. In high-energy ball milling, plastic deformation, cold-welding and fracture are predominant factors, in which the deformation leads to a change in particle shape, cold-welding leads to an increase in particle size and fracture leads to decrease in particle size resulting in the formation of fine dispersed alloying particles in the grain-refined soft matrix. By utilizing mechanical milling various kind of aluminium/ nickel/ magnesium/ copper based nanoalloys, wear resistant spray coatings, oxide and carbide strengthened aluminium alloys, and many other nanocomposites have been synthesized in very high yield. The mechanical milling has been utilized for the synthesis of nanomaterials either by milling and post annealing or by mechanical activation and then applying some other process on these activated materials. This review is a systematic view of the basic concept of mechanical milling, historical view and applications of mechanical milling in the synthesis of various nanomaterials, nanosomposites, nnaocarbons and nano quasicrystalline materials.

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“…Mechanical alloying method has been used over the years as an acceptable fabrication method for the development of a variety of advanced materials such as nanomaterials, quasi-crystals, amorphous materials and nanocomposites (7,8). The most important mechanisms of this method are repeated welding, fracturing, and re-welding of particles (9). Metal matrix composites (MMCs) consist of two main components including the matrix phase and reinforcement phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al59Cu25.5Fe12.5B3 Quasi-crystals on Microstructure and Flexural Strength of Aluminum Matrix Composites Prepared by Spark Plasma Sintering Method

Faraji,

Aghaali,

Rahimipour

2024

IJE

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In this study, Al-based composites reinforced with Al59Cu25.5Fe12.5B3 quasicrystal (QC) were prepared by spark plasma sintering (SPS) method. Microstructural and mechanical properties were examined. It is observed that with addition of quasi-crystalline reinforcement the intensity of the quasi-crystalline peak has increased. Also, it is observed that by performing spark plasma sintering, the quasi-crystalline particles maintain their stability. Due to low temperature of the process and the short time of spark plasma sintering, the occurrence of destructive phases within the quasi-crystal has been prevented. based on field emission scanning electron microscopy (FESEM) images, the distribution of quasi-crystalline particles at the sample level has increased. In addition, the mechanical properties are improved by increasing the quasi-crystalline particles. Therefore, the sample with 15 vol.% of quasi-crystal has better results than other samples in improving microstructural and mechanical properties and it can be considered as an optimal sample with suitable practical properties.

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Formation of nano quasicrystalline and crystalline phases by mechanical alloying

Cited by 16 publications

References 37 publications

Microstructure, phase transformation and hardness of nanometric Cr-Al multilayer coatings

Microstructure, phase transformation and hardness of nanometric Cr-Al multilayer coatings

Mechanical Milling: a Top Down Approach for the Synthesis of Nanomaterials and Nanocomposites

Effect of Al59Cu25.5Fe12.5B3 Quasi-crystals on Microstructure and Flexural Strength of Aluminum Matrix Composites Prepared by Spark Plasma Sintering Method

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