Preparation of bulk ultrafine-grained and nanostructured Zn, Al and their alloys by in situ consolidation of powders during mechanical attrition

Zhang, X.; Wang, H.; Kassem, Magdy; Narayan, J.; Koch, Carl C.

doi:10.1016/s1359-6462(02)00048-9

Cited by 56 publications

(23 citation statements)

References 16 publications

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“…Mechanical alloying (MA) is now recognized as a versatile process for the fabrication of a broad range of nanocrystalline powders. These powders include ODS alloys [198], amorphous alloys [202,203], nanocrystalline metals/alloys [204][205][206][207][208][209][210][211][212][213] and supersaturated solid solution [214,215]. The disadvantage of ball-milling for making nanocrystalline powders is the contamination of products from the milling media (balls and vial) and atmosphere.…”

Section: Solid Route 331 Mechanical Alloying/millingmentioning

confidence: 99%

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Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

844

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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Section: Solid Route 331 Mechanical Alloying/millingmentioning

confidence: 99%

“…More recently, Zhang et al investigated the evolution of microstructure of hcp Zn metal prepared by ball milling [212,213]. The typical TEM micrographs of Zn metal ball milled for different times at room temperature are shown in Fig.…”

Section: Solid Route 331 Mechanical Alloying/millingmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

844

345

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“…Whenever we have proceed for long milling times, the aluminum particles were flattened and flake-like particles were formed (Fig. 3b) [16,17]. Moreover, micro welding between the particles was also observed.…”

Section: Methodsmentioning

confidence: 93%

Effect Of Different Mechanical Milling Processes On Morphology And Microstructural Changes Of Nano And Micron Al-Powders

Kim¹,

Madavali²,

Eom³

et al. 2015

Archives of Metallurgy and Materials

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In this research, effect of the various mechanical milling process on morphology and microstructural changes of nano and micron Al-powders was studied. The milling of Al-powders was performed by both high energy and low energy ball milling process. The influence of milling (pulverizing) energy on the structural changes of Al-powders was studied. Al-nanoparticles were agglomerated during the MA and its size was increased with increasing milling while micron Al-powder gets flattened shape during high energy ball milling due to severe plastic deformation. Meanwhile, structural evolution during high energy ball milling of the nano powder occurred faster than that of the micron powder. A slight shift in the position of X-ray diffraction peaks was observed in nano Al-powders but it was un-altered in macro Al-powders. The variation in lattice parameters was observed only for nano Al powders during the high energy ball milling due to lattice distortion.

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“…Mechanical alloying of soft and low melting point metals such as Cu [1], Zn and Al [11] has been proved to result in the formation of large balls of material (instead of powder), but still retaining nanometer-sized grains. Based on these properties, Zhang et al [8] synthesized consolidated Cu-2.5 vol.% Al 2 O 3 powder.…”

Section: Introductionmentioning

confidence: 99%

Nanomechanical properties and thermal decomposition of Cu-Al₂O₃composites for FGM applications

et al. 2016

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-It is widely reported that copper-alumina (Cu-Al 2 O 3 ) nanocomposite materials exhibit high potential for use in structural applications in which enhanced mechanical characteristics are required. The investigation of Cu-Al 2 O 3 nanocomposites which are to form a functionally graded material (FGM) structure in terms of nanomechanical/structural integrity and thermal stability is still scarce. In this work, fully characterized nanosized Al 2 O 3 powder has been incorporated in Cu matrix in various compositions (2, 5 and 10 wt.% of Al 2 O 3 content). The produced composites were evaluated in terms of their morphology, structural analysis, thermal behavior, nanomechanical properties and their extent of viscoplasticity. The results reveal that all nanocomposites degrade at elevated temperatures; increased surface mass gain with decreasing Al 2 O 3 content was observed, while no such difference of % mass gain in 5 and 10 wt.% of Al and Al 2 O 3 content in Cu was observed. The increase of Al 2 O 3 wt.% content results in thermal stability enhancement of the nanocomposites. The thermal decomposition process of the material is reduced in the presence of 10 wt.% of Al 2 O 3 content. This result for the matrix decomposition can be explained by a decrease in the diffusion of oxygen and volatile degradation products throughout the composite material due to the incorporation of Al and Al 2 O 3 . The Al 2 O 3 powder enhances the overall thermal stability of the system. All samples exhibited significant pile-up of the materials after nanoindentation testing. Increasing the wt.% of Al 2 O 3 content was found to increase the creep deformation of the samples as well as the hardness and elastic modulus values.

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Preparation of bulk ultrafine-grained and nanostructured Zn, Al and their alloys by in situ consolidation of powders during mechanical attrition

Cited by 56 publications

References 16 publications

Nanocrystalline materials and coatings

Nanocrystalline materials and coatings

Effect Of Different Mechanical Milling Processes On Morphology And Microstructural Changes Of Nano And Micron Al-Powders

Nanomechanical properties and thermal decomposition of Cu-Al₂O₃composites for FGM applications

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Preparation of bulk ultrafine-grained and nanostructured Zn, Al and their alloys by in situ consolidation of powders during mechanical attrition

Cited by 56 publications

References 16 publications

Nanocrystalline materials and coatings

Nanocrystalline materials and coatings

Effect Of Different Mechanical Milling Processes On Morphology And Microstructural Changes Of Nano And Micron Al-Powders

Nanomechanical properties and thermal decomposition of Cu-Al2O3composites for FGM applications

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Nanomechanical properties and thermal decomposition of Cu-Al₂O₃composites for FGM applications