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Park, B. G.; Crosky, A.; Hellier, A.K.

doi:10.1023/a:1017921813503

Cited by 82 publications

(17 citation statements)

References 8 publications

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“…The incorporation [3] of different metal gasses (mainly Ni (g) ) to the furnace atmosphere allows the use of higher temperatures, thus increasing the yield of the whisker production. The growth of such alpha-alumina (corundum) whiskers was established to occur through Vapor-Liquid-Solid (VLS) deposition.Great benefits are expected with the use of VLS alumina whiskers as reinforcing elements in composites [4][5][6] and our experiments are presently corroborating it. Although the details of the analyses performed on our first demonstration material (a 6061 T6 aluminum matrix composite with a 10 % volume of VLS Al 2 O 3 whiskers) will be published as soon as possible, here we can anticipate that the improvement obtained in the mechanical performance of the composite is fairly good.…”

supporting

confidence: 75%

“…Great benefits are expected with the use of VLS alumina whiskers as reinforcing elements in composites [4][5][6] and our experiments are presently corroborating it. Although the details of the analyses performed on our first demonstration material (a 6061 T6 aluminum matrix composite with a 10 % volume of VLS Al 2 O 3 whiskers) will be published as soon as possible, here we can anticipate that the improvement obtained in the mechanical performance of the composite is fairly good.…”

supporting

confidence: 75%

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New Massive Vapor‐Liquid‐Solid Deposition of α‐Al₂O₃ Fibers

et al. 2007

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We have elsewhere [1,2] previously described a novel method for production of alumina whiskers from aluminum pieces and powdered silica in Ar atmospheres. In such procedure, at adequate temperatures, the Al evaporates and reacts with the SiO 2 , producing SiO (g) and AlO x(g) . The subsequent chain of reactions allows the deposition of thin alumina single crystals, or whiskers, with high aspect ratios. The incorporation [3] of different metal gasses (mainly Ni (g) ) to the furnace atmosphere allows the use of higher temperatures, thus increasing the yield of the whisker production. The growth of such alpha-alumina (corundum) whiskers was established to occur through Vapor-Liquid-Solid (VLS) deposition.Great benefits are expected with the use of VLS alumina whiskers as reinforcing elements in composites [4][5][6] and our experiments are presently corroborating it. Although the details of the analyses performed on our first demonstration material (a 6061 T6 aluminum matrix composite with a 10 % volume of VLS Al 2 O 3 whiskers) will be published as soon as possible, here we can anticipate that the improvement obtained in the mechanical performance of the composite is fairly good.Such excellence has forced a lot of research in the field of whiskers, although in the past their use has always been seriously restrained due to cost considerations. Therefore, new technologies that can produce affordable alumina whiskers are presently being demanded by industries interested in advanced composite materials. In our case (VLS alumina whiskers) our approach to such challenge was to investigate how the incorporation of controlled amounts of an oxidant agent affected the VLS deposition of crystals.Experiments were designed trying to maintain the system under such conditions that the VLS (instead of Vapor-Solid, VS) were still the dominant deposition mechanism. Therefore, all the advantages of the VLS c-axis alumina single crystals could be preserved, together with an increase in their production yield. Our experiments soon demonstrated that this increase was much higher than expected, in some cases more than a hundred-fold increase!). Surprisingly, a newly fashioned VLS mechanism was also found, which has not previously been described elsewhere. Here we will describe its main features together with the physical and chemical processes involved.In order to establish the reinforcing potential of the whiskers produced, we decided to employ atomic force microscopy (AFM). The results demonstrated that smooth-surfaced single crystal fibers were produced under this massive VLS deposition, although other microstructures have also been observed. ExperimentalOur predictions on the behavior of the system were grounded on the respective Al-Al 2 O 3 and Si-SiO 2 volatility diagrams [7,8] at 1550°C (Fig. 1). A fast oxidation of the Al wires (employed as raw materials in our experiments) was to be avoided, because this would restrain the production of Al(g), thus hindering the rest of the VLS process. Figure 1(b) reveals that below 10 -3 atm,...

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confidence: 75%

New Massive Vapor‐Liquid‐Solid Deposition of α‐Al₂O₃ Fibers

et al. 2007

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“…This makes it easy to simulate elastic modulus by a numerical model. Park et al [21] compared elastic modules of composites using several models. In the case of composites reinforced with spherical particles, the simple rule of mixture was not valid for predicting the elastic modulus.…”

Section: Elastic Modulusmentioning

confidence: 99%

Mechanical properties of in situ Fe3Al matrix composites fabricated by MA–PDS process

Park

et al. 2006

Intermetallics

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“…Hardness and Wear resistance of the composite is improved by proper addition of the reinforcement. However, elongation of the composite may be reduced [3,4]. By addition of the hard phase particles, greatly improves the strength which in turn depends on the manipulation method [5].…”

Section: Introductionmentioning

confidence: 99%

Processing of 5083 Aluminum Alloy Reinforced with Alumina through Microwave Sintering

Verma¹,

Kumar²,

Chandrakar³

et al. 2012

JMMCE

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Today, there is an increasing demand worldwide for the advanced materials in order to obtain the desired properties. This is because a single material generally cannot meet the requirement of harsh engineering environment that is why the need for composites arises. Metal matrix composite is an important class of materials with high potential for structural applications requiring high specific modulus, strength and toughness. Metal matrix composites with unique properties are growing every day and widely used in different industries because of their high mechanical properties and wear resistance.

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Untitled

Cited by 82 publications

References 8 publications

New Massive Vapor‐Liquid‐Solid Deposition of α‐Al₂O₃ Fibers

New Massive Vapor‐Liquid‐Solid Deposition of α‐Al₂O₃ Fibers

Mechanical properties of in situ Fe3Al matrix composites fabricated by MA–PDS process

Processing of 5083 Aluminum Alloy Reinforced with Alumina through Microwave Sintering

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Cited by 82 publications

References 8 publications

New Massive Vapor‐Liquid‐Solid Deposition of α‐Al2O3 Fibers

New Massive Vapor‐Liquid‐Solid Deposition of α‐Al2O3 Fibers

Mechanical properties of in situ Fe3Al matrix composites fabricated by MA–PDS process

Processing of 5083 Aluminum Alloy Reinforced with Alumina through Microwave Sintering

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New Massive Vapor‐Liquid‐Solid Deposition of α‐Al₂O₃ Fibers

New Massive Vapor‐Liquid‐Solid Deposition of α‐Al₂O₃ Fibers