Structure of diamond–silicon carbide nanocomposites as a function of sintering temperature at 8GPa

Balogh, Levente; Nauyoks, S.; Żerda, T. W.; Pantea, Cristian; Stelmakh, S.; Pałosz, B.; Ungár, Tamás

doi:10.1016/j.msea.2007.10.006

Cited by 11 publications

(9 citation statements)

References 27 publications

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“…The peak broadening of primary is relatively small, similar to the broadening observed in the ASR material ( Fig. 8), while the reflections of the martensitic components are much broader and also show a strong strain broadening with a high dislocation population (Ungá r, 2008). In addition, it can be seen that the 00.2 and 00.4 peaks of martensitic are significantly less wide than the other non-basal reflections.…”

Section: Figuresupporting

confidence: 74%

“…The modeled theoretical whole diffraction pattern is fitted to the measured data by refining the parameters of the microstructure until a solution is found (Leoni et al, 2004;Scardi et al, 2010;Ribá rik et al, 2004;. These methods are routinely used to quantitatively characterize the defect structure of cubic and hexagonal materials, including alloys having industrial applications (Pantea et al, 2004;Má this et al, 2004;Schafler et al, 2005;Nyilas et al, 2006;Balogh et al, 2008;Kerber et al, 2009;Balogh, Brown et al, 2012;Mayer et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Quantitative characterization of the microstructure of heat-treated Zr-Excel by neutron line profile analysis

et al. 2016

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Neutron diffraction line profile analysis (DLPA) and transmission electron microscopy were used to characterize the components of the bimodal microstructure of Zr‐Excel (Zr–3.5Sn–0.8Mo–0.8Nb), a nuclear structural material. The dual microstructure, consisting of equiaxed primary grains and martensitic domains both having hexagonal close‐packed (h.c.p.) α crystal structure, forms when the as‐received Zr‐Excel alloy is heat treated at a high temperature and subsequently quenched, i.e. is solution treated. Because both microstructure components have the same crystal structure the reflections from the two components overlap significantly. The article presents how the multi‐phase analysis capability of modern DLPA methods can be used to model the measured neutron diffraction patterns as the sum of two sub‐patterns corresponding to the components of such a bimodal microstructure, which can be found in many hexagonal alloys relevant for industrial applications. The results show that the large equiaxed primary h.c.p. α grains have a highly correlated low‐density dislocation structure and large sub‐grains (∼300 nm), while the large martensitic domains have a randomly arranged very high density dislocation structure and sub‐grains the size of ∼30 nm. The significantly different defect structures of the primary and martensitic phases manifest as large differences in the hardness and ductility of the individual components. As a result of this duality of the mechanical properties, solution‐treated Zr‐Excel materials can be considered as analogous to metal matrix composites where a softer ductile matrix contains a harder brittle reinforcing phase.

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Section: Figuresupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Quantitative characterization of the microstructure of heat-treated Zr-Excel by neutron line profile analysis

et al. 2016

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“…X-ray diffraction peak profile analysis was carried out to determine the crystallite size distribution and the dislocation substructure of the nanocomposites studied using the CMWP fitting procedure program. We have assumed that strain is caused by dislocations [8]. The lattice parameters of the various nanocomposites were obtained from the positions of the X-ray diffraction peaks calculated by the Rietveld method.…”

Section: Methodsmentioning

confidence: 99%

“…Until recently, different procedures have been used for the evaluation of X-ray diffraction profiles or patterns. The convolutional multiple whole profile (CMWP) method, produces the convolutions of model-based, phys- ically well-established size and strain profiles and that of the instrumental profiles, and compares the so constructed and the measured diffraction patterns by using a non-linear least squares fitting procedure [7,8].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and microstructural characterization of dispersion strengthened Al–C system nanocomposites

Santos-Beltrán

Gallegos-Orozco

Reyes

et al. 2010

Journal of Alloys and Compounds

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“…Também identificaram que a ausência de picos devido ao silício indicava que a reação estava completa. O não aparecimento de grafite confirmava que a sinterização foi realizada na região em que o diamante estava na forma estável do carbono [5].…”

Section: Difração De Raios-x (Drx)unclassified

CARACTERIZAÇÃO MICROESTRUTURAL DE COMPÓSITO ABRASIVO DE DIAMANTE-Si OBTIDO POR SINTERIZAÇÃO CÍCLICA APAT

Abreu¹,

Skury²,

Bobrovnitchii³

2018

ABM Proceedings

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ResumoO objetivo geral foi produzir e caracterizar a microestrutura de um compósito abrasivo nanoestruturado no sistema D-Si, via sinterização cíclica de alta pressão e alta temperatura (HPHT). A sinterização cíclica em alta pressão e alta temperatura de compósitos foi feita a partir de uma mistura de 70% diamante e 30% de Si como ligante, o qual foi moído por moagem de alta energia sendo então partícula nanométricaso. A sinterização foi realizada por 1 a 4 ciclos de pressão (P) de 7GPa-4GPa e temperatura (T) 1600°C-300°C, para um tempo (t) de 1min. As análises de difrações de raios X mostraram a ocorrência, além do diamante, de SiC, FeSi e grafite. As análises de MEV e EDS mostraram uma distribuição uniforme dos cristais de diamante na matriz de SiC. A análise da região de fratura das amostras mostrou que todos os cristais de diamante foram abrangidos pelo ligante, ou seja, a liga formada a partir da interação de carbono e de silício. Finalmente, conclui-se que esta pesquisa aprimorou a técnica de produção de MCDs para uso futuro em bits de brocas de perfuração de poços de petróleo. Palavras-chave: Carbeto de silício; Compósitos diamantados; Sinterização. MICROSTRUCTURAL CHARACTERIZATION D-SI ABRASIVE COMPOSITES OBTAINED IN SINTERING CYCLIC HPHT AbstractThe overall objective was to produce and characterize the microstructure of a nanostructured composite abrasive in D-Si system, via high pressure high temperature (HPHT) cyclic sintering. Cyclic sintering at high pressure and high temperature composites is made from a mixture of 70% diamond and 30% Si as a binder, which was ground by high energy milling then being nanometric so particle. Sintering was carried out by 1 to 4 pressure cycles (P) 7GPa-4GPa and temperature (T) 1600 °C-300°C for a time (t) of 1 min. The analysis of X-ray diffraction showed the occurrence, in addition to diamond, SiC, FeSi and graphite. The SEM and EDS analysis showed a uniform distribution of diamond crystals in a SiC matrix. The analysis of the samples fractured region showed that all diamond crystals were covered by the binder, or the alloy formed from the interaction carbon and silicon. Eventually, it is concluded that this study improved the MCDs production technique for use in future bit oil well drilling bits.

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Structure of diamond–silicon carbide nanocomposites as a function of sintering temperature at 8GPa

Cited by 11 publications

References 27 publications

Quantitative characterization of the microstructure of heat-treated Zr-Excel by neutron line profile analysis

Quantitative characterization of the microstructure of heat-treated Zr-Excel by neutron line profile analysis

Mechanical and microstructural characterization of dispersion strengthened Al–C system nanocomposites

CARACTERIZAÇÃO MICROESTRUTURAL DE COMPÓSITO ABRASIVO DE DIAMANTE-Si OBTIDO POR SINTERIZAÇÃO CÍCLICA APAT

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