The grain size and porosity dependent elastic moduli and yield strength of nanocrystalline ceramics

Zhou, Jianqiu; Li, Yuanling; Zhu, Rong; Zhang, Zhenzhong

doi:10.1016/j.msea.2006.10.005

Cited by 32 publications

(17 citation statements)

References 27 publications

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“…10 depicts the variation of elastic modulus of MMCs and the total number of small segment with different matrix grain sizes. The influences of microstructure and size of nanocrystalline on its effective elastic properties have been discussed [46][47][48]. According to their conclusions, for the nano/ultrafine-grained solids in this model, the variation of elastic modulus with grain size can be neglected.…”

Section: Resultsmentioning

confidence: 99%

Computational prediction of waviness and orientation effects in carbon nanotube reinforced metal matrix composites

Dong

Zhou

Liu

et al. 2015

Computational Materials Science

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Section: Resultsmentioning

confidence: 99%

Computational prediction of waviness and orientation effects in carbon nanotube reinforced metal matrix composites

Dong

Zhou

Liu

et al. 2015

Computational Materials Science

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“…Due to the ease of fabrication, most of micro/nano mechanical resonators are made of nanocrystalline silicon or nanocrystalline diamond (Tao et al 2014). Due to their distinct atomic structure (Gleiter et al 2000;Wang et al 2003;Kim and Bush 1999;Zhou et al 2007;Duan et al 2005;Fitzsimmons et al 1995;Swygenhoven et al 1999;Sanders et al 1997), grain boundaries have lower Young's moduli than the interior of the grains in polycrystalline materials (Sanders et al 1997;Fougere et al 1995;Xing et al 1998;Shen et al 1995;Wang et al 1995;Spriggs 1961;Boccaccini et al 1993). The grain boundary volume fraction could be as high as 50 % for a NcM whose grain average size is 5 nm (Sharma and Ganti 2003).…”

Section: Effective Young's Modulus Of Mechanical Resonators Made Of Ncmsmentioning

confidence: 99%

“…It had been attributed to the increase in the volume fraction of the grain boundary which has a lower Young's modulus due to the increase in the interatomic spacing and the increase in the amount of impurities residing in the grain boundary (Mohr et al 2014;Gleiter et al 2000;Wang et al 2003;Kim and Bush 1999;Zhou et al 2007;Duan et al 2005;Fitzsimmons et al 1995;Swygenhoven et al 1999;Sanders et al 1997). Thus, the atomic structure as well as the Young's modulus of the grain boundary significantly affects the behavior of NcMs in different applications.…”

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confidence: 99%

Modeling of mechanical resonators used for nanocrystalline materials characterization and disease diagnosis of HIVs

Shaat

Abdelkefi

2015

Microsyst Technol

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“…According to the authors, their model is able to interpret the breakdown of the Hall Petch relation with decreasing grain size and the rate dependence of the deformation behavior. In another mixture based model, Zhou et al [162] investigated the effect of grain size and porosity on the elastic modulus and strength of porous and multi-phase nanocrystalline ceramics. The authors developed a mixtures-based model to describe the mechanical behavior of constituent phases and further applied Budiansky's self-consistent method [163] to determine the effective mechanical properties of the composites.…”

Section: Finite Element Modelingmentioning

confidence: 99%

Novel Processing of Unique Ceramic-Based Nuclear Materials and Fuels

Zhang¹,

Singh²

2008

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Advances in nuclear reactor technology and the use of gas-cooled fast reactors require the development of new materials that can operate at the higher temperatures expected in these systems. These include refractory alloys based on Nb, Zr, Ta, Mo, W, and Re; ceramics and composites such as those based on silicon carbide (SiC f -SiC); carbon-carbon composites; and advanced coatings. Besides the ability to handle higher expected temperatures, effective heat transfer between reactor components is necessary for improved efficiency. Improving thermal conductivity of the materials used in nuclear fuels and other temperature critical components can lower the center-line fuel temperature and thereby enhance durability and reduce the risk of premature failure.Silicon carbide (SiC) is an important ceramic, most commonly used because of its excellent properties such as high strength, high modulus, excellent creep resistance and its high temperature stability. Moreover, crystalline silicon carbide is attracting wide attention as a promising candidate for several applications in nuclear reactors owing to its high thermal conductivity, high melting temperature, good chemical stability, and resistance to swelling under heavy ion bombardment. There have been many efforts to develop SiC based composites in various forms for use in advanced energy systems. However, fabricating SiC based composites by traditional powder processing route generally requires very high temperatures for pressureless sintering. In recent years, with the development of high yield preceramic precursors, the polymer infiltration and pyrolysis (PIP) method has aroused interest for the fabrication of ceramic based materials. Polymer derived ceramic materials offer unique advantages such as ability to fabricate net shaped components, incorporate reinforcements, along with lower processing temperatures, and perhaps most importantly relatively easy control over the microstructure. The raw materials are element-organic polymers whose composition and architecture can be tailored and varied.The primary focus of this work is to use a pyrolysis-based process to fabricate a host of novel silicon carbide-metal carbide/oxide composites, and to synthesize new materials based on mixed-metal (metal/silicon) carbides that cannot be processed using conventional techniques. These mixedcarbide material systems are expected to offer improved material properties for higher-temperature applications. Our fabrication technique resulted in both amorphous and nano-grained SiC matrix composites by controlled pyrolysis of allylhydridopolycarbosilane (AHPCS), the precursor for SiC for our study, under inert argon atmosphere.Cylindrical pellets, φ25 × 25 mm, were fabricated for bulk scale characterization. These samples were analyzed in terms of density and porosity, thermal conductivity, and flexural strength under multiaxial loading conditions. The final composition in the fabricated composite was studied use Xray diffraction (XRD). This was useful in understanding the relative stabil...

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The grain size and porosity dependent elastic moduli and yield strength of nanocrystalline ceramics

Cited by 32 publications

References 27 publications

Computational prediction of waviness and orientation effects in carbon nanotube reinforced metal matrix composites

Computational prediction of waviness and orientation effects in carbon nanotube reinforced metal matrix composites

Modeling of mechanical resonators used for nanocrystalline materials characterization and disease diagnosis of HIVs

Novel Processing of Unique Ceramic-Based Nuclear Materials and Fuels

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