Electron microscopy nanoscale characterization of ball milled Cu-Ag powders. Part II: Nanocomposites synthesized by elevated temperature milling or annealing

Zghal, Slim; Twesten, R. D.; Wu, Fang; Bellon, Pascal

doi:10.1016/s1359-6454(02)00286-0

Cited by 50 publications

(21 citation statements)

References 17 publications

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“…Another possible explanation is that at the high strain rates achieved during high-energy ball milling, fcc and bcc crystals would both deform plastically by twinning. However, in our recent detailed transmission electron microscopy (TEM) characterization of the microstructure of ball-milled Ag-Cu powder, [33,34] no twin bands were detected. Moreover, while the microstructure evolved in Cr-Mo ball-milled solid solutions is yet unknown, our present analysis suggests that the microstructure is dominated by dislocations rather than by stacking faults and twins (refer to the following text).…”

Section: Discussionmentioning

confidence: 88%

“…Contrary to the present system, however, it was not possible to anneal the powders to reduce the dislocation density while retaining the solid solution, as chemical decomposition always preceded recovery or recrystallization during annealing. [34] This is probably because of the large value of the reduced critical temperature in that system, T c /T m Ϸ 1.5, compared to Ϸ0.55 in the Cr-Mo system.…”

Section: Discussionmentioning

confidence: 95%

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Cr-Mo solid solutions forced by high-energy ball milling

Hahn

Bellon

2004

Metall Mater Trans A

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Mixtures of Cr and Mo elemental powders, with the nominal compositions Cr 25 Mo 75 , Cr 50 Mo 50 , and Cr 75 Mo 25 , are processed by high-energy ball milling at ambient temperature. Milling is observed to force the mixing of the immiscible bcc elements Cr and Mo into solid solutions. The lattice parameter of these solid solutions, measured by X-ray diffraction (XRD), displays the expected positive deviation from Vegard's law. These deviations are compared to the ones predicted by Eshelby's inclusion model for dilute alloys. The conventional Williamson-Hall approach is shown to fail to determine the grain size in as-milled samples, probably due to the high density of dislocations. Annealing at 700°C for 10 hours under argon leads to a large reduction in structural defect density, without inducing any significant decomposition. The mixing measured in Cr-Mo is discussed in the broader context of the mechanical mixing forced by ball milling in moderately immiscible systems.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 95%

Cr-Mo solid solutions forced by high-energy ball milling

Hahn

Bellon

2004

Metall Mater Trans A

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“…The maximum value was 4.7 GPa (when position x was 12 µm) which is in agreement with the hardness of Cu-Ag nanocomposite film when Cu concentration is close to 80 at%. 37) Then, the nanohardness dropped moving toward the Ag side. Starting from a position x of 18 µm, it remained around 1.8 GPa suggesting the ending of the transition layer.…”

Section: (B) Thismentioning

confidence: 99%

Interfacial Nano-Mechanical Properties of Copper Joints Bonded with Silver Nanopaste near Room Temperature

Peng

Zou

et al. 2015

Mater. Trans.

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Sintering of nanomaterials at low temperatures has been demonstrated as an alternative for flexible electronic packaging. Silver nanowires were synthesized via polyol method and used as filler material for bonding copper to copper near room temperature. The experimental results indicated that both silver-to-silver and copper-to-silver formed metallurgical bonds. The elastic modulus and nano-hardness of copper joints at the copper-silver interface were characterized using nanoindentation. A transition layer at the interface was observed and its thickness was determined. Sintered silver filler material showed good elasticity both inside and out of the transition layer.

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“…For large scale production with nano size grain, mechanical millings are more economical processes [2]. The kinetics of mechanical milling or alloying depends on the energy perature can also enhance the formation of nanocrystalline phases [9]. In addition, the high strain-rate deformation and cumulative strain accompanying during collisions of balls lead to particle fracture [10].…”

Section: Mechanical Millingmentioning

confidence: 99%

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

Yadav¹,

Yadav²,

Singh³

2012

459

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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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Electron microscopy nanoscale characterization of ball milled Cu-Ag powders. Part II: Nanocomposites synthesized by elevated temperature milling or annealing

Cited by 50 publications

References 17 publications

Cr-Mo solid solutions forced by high-energy ball milling

Cr-Mo solid solutions forced by high-energy ball milling

Interfacial Nano-Mechanical Properties of Copper Joints Bonded with Silver Nanopaste near Room Temperature

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

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