Aluminium pm: alloys and composites development and enhancement

Ruiz-Navas, E.M.; Delgado, Marco; Torralba, J. M.

doi:10.3989/revmetalm.2008.v44.i3.108

Cited by 1 publication

(1 citation statement)

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“…Once they are defined, ball to powder ratio and atmosphere, speed and especially milling time must be strictly controlled to avoid contamination of the powders or an excessive temperature (increment which, in some cases, may be a disadvantage). [5][6][7] Then, sintering is carried out, heating the powder in a protective atmosphere and getting a denser product of higher mechanical strength. Temperature and time of sintering must be controlled to ensure a suitable process.…”

Section: Introductionmentioning

confidence: 99%

Development of a high wear resistance aluminium matrix nanoreinforced composite

Cabeza

Merino

Rey

et al. 2012

Surface & Interface Analysis

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aBecause of the present economic conditions, the great energetic dependence on petroleum derivatives and the restrictive regulations of environmental pollution, development of new materials and processing methods has become a very important technological challenge. 7075 aluminium alloys (Al-Mg-Zn-Cu) have been widely used as structural materials in the aeronautics industry because of their attractive properties such as very low density and high specific strength, ductility, toughness and resistance to fatigue. In the last few years many studies have been carried out to enhance these properties by developing aluminium matrix microparticulate reinforced composites. These properties can be improved by the use of nanoparticulate reinforcements. In this work, some steps of the fabrication of a new advanced aluminium matrix nanoreinforced composite are analyzed. A powder metallurgy 7075 aluminium alloy was chosen as the matrix and TiC nanoparticles were used as reinforcement material. Although the manufacturing process consists of many stages (mechanical alloying, sintering, extrusion, aging treatment, etc.), in this work only mechanical alloying and sintering are considered. Microstructural characterization of samples was carried out by means of optical microscopy and SEM techniques. Transmission electron microscopy was used to determine the adequate distribution of the reinforcement material. Vickers hardness tests were carried out and structural changes were studied by X-ray diffraction tests.

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Section: Introductionmentioning

confidence: 99%