Novel materials synthesis by mechanical alloying/milling

Murty, B.S.; Ranganathan, S.

doi:10.1179/095066098790105654

Cited by 175 publications

(170 citation statements)

References 151 publications

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“…The plastic deformation of quasicrystal is controlled by dislocations at high temperature, but the role of the same at room temperature is highly restricted which makes the QC phase inherently brittle [15]. It is also interesting to point out that the milling temperature is reported to vary in the range of 100-200 C depending on the milling media and milling parameters [16]. The rise in temperature has certainly a beneficial effect on the plastic deformation of quasicrystalline and crystalline materials during ball milling.…”

Section: Resultsmentioning

confidence: 99%

Nanocrystallization and structural correlation in quasicrystalline and crystalline phases during mechanical milling

Tiwari¹,

Yadav²,

Mukhopadhyay³

et al. 2009

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. The main objective of the proposed work is to investigate the formation of nanoquasicrystalline and related nanocrystalline phases in Al--Cu--Fe system during mechanical milling at the initial stage of milling. The mechanical milling of a quasicrystalline Al 65 Cu 20 Fe 15 alloy was performed in a high-energy ball mill (Szegvari attritor) by varying milling time from 2.5 min to 60 min under liquid hexane medium at the speed of 400 rpm with a ball to powder ratio of 40 : 1. X-ray diffraction was carried out for evaluating the lattice strain, lattice parameters and crystallite sizes of the milled sample. It was found that the evolution of monoclinic Al 13 Fe 4 phase from Al 65 Cu 20 Fe 15 quasicrystalline phase occurred after 2.5 min of milling, which was further confirmed by transmission electron microscopy. After 5 min of ball milling nano size disordered B2 phase (bcc, a ¼ 0.29 nm) was also found. The systematic analysis of the XRD patterns for evolving lattice parameter, sequential strain suggests that the lattice strain during milling has been quite considerable.

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Section: Resultsmentioning

confidence: 99%

Nanocrystallization and structural correlation in quasicrystalline and crystalline phases during mechanical milling

Tiwari¹,

Yadav²,

Mukhopadhyay³

et al. 2009

Zeitschrift Für Kristallographie - Crystalline Materials

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“…15,16 With the subsequent discovery that mechanical alloying could yield amorphous metal alloys, 17 applications that employ mechanical alloying as a means of mixing inorganic materials have greatly increased and diversified. 14,18,19 The utility of mechanical alloying in obtaining unique multifunctional materials from commodity feedstock has not, however, extended to the organic materials arena until quite recently. Efforts designed to mechanically alloy organic materials now include both small organic molecules [20][21][22][23] and polymers.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic Mechanical Alloying of Poly(methyl methacrylate) with Polyisoprene and Poly(ethylene-alt-propylene)

et al. 2000

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Mechanical alloying is performed at cryogenic temperatures to incorporate polyisoprene (PI) or its hydrogenated analogue poly(ethylene-alt-propylene) (PEP) into poly(methyl methacrylate) (PMMA) as an example of high-energy solid-state blending. Morphological characterization of the blends by X-ray and electron microscopies confirms that the degree of dispersion of the constituent polymers improves with increasing milling time. Such dispersion in the PEP/PMMA blends is, however, ultimately compromised by phase coarsening when the materials are postprocessed above the PMMA glass transition temperature in the melt. Milling-induced PI cross-linking serves to suppress phase coarsening in PI/ PMMA blends, which remain relatively well-dispersed even after postprocessing. These blends are generally less fracture-resistant than the as-received PMMA due mainly to the accompanying reduction in PMMA molecular weight. Their optical transparency is observed to decrease dramatically with increasing PEP or PI concentration until they appear opaque. An overall improvement in blend properties by mechanical alloying is, however, anticipated upon judicious selection of more degradation-resistant polymers.

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“…In our case, no heating/cooling was purposely performed on the as-milled powders. However, it is well-known that, due to the impacts between the powder and balls, temperature can locally rise significantly during the milling, eventually exceeding the Néel (or blocking) temperature of the system (Murty & Ranganathan, 1998). As a result, and due to the stray fields emanated from SmCo 5 grains, an exchange interaction is likely to be set during the milling of this composite material due to an instantaneous heating/cooling process caused by the above mentioned impacts.…”

Section: Enhanced Magnetic Properties In Hard Ferromagnetic Particlesmentioning

confidence: 99%

Oxide-Matrix Based Nanocomposite Materials for Advanced Magnetic and Optical Functionalities

Pellicer¹,

Rossinyol²,

Cabo³

et al. 2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

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Novel materials synthesis by mechanical alloying/milling

Cited by 175 publications

References 151 publications

Nanocrystallization and structural correlation in quasicrystalline and crystalline phases during mechanical milling

Nanocrystallization and structural correlation in quasicrystalline and crystalline phases during mechanical milling

Cryogenic Mechanical Alloying of Poly(methyl methacrylate) with Polyisoprene and Poly(ethylene-alt-propylene)

Oxide-Matrix Based Nanocomposite Materials for Advanced Magnetic and Optical Functionalities

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