Interpretation of High-temperature creep of SiC by deformation mapping techniques

Krishnamachari, V.; Notis, Michael R.

doi:10.1016/0025-5416(77)90198-7

Cited by 29 publications

(4 citation statements)

References 10 publications

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“…Diffusional creep in polycrystalline SiC occurs by diffusion of carbon 22 or silicon 23 at grain boundaries 22,23 or within grains, 24 or by diffusion of impurities at grain boundaries 25 . There is a very limited amount of data on diffusion of carbon and silicon elements in SiC.…”

Section: Resultsmentioning

confidence: 99%

Tensile Creep Behavior of SiC‐Based Fibers With a Low Oxygen Content

Sauder

Lamon

2007

Journal of the American Ceramic Society

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The creep behavior of Hi‐Nicalon, Hi‐Nicalon S, and Tyranno SA3 fibers is investigated at temperatures up to 1700°C. Tensile tests were carried out on a high‐capability fiber testing apparatus in which the fiber is heated uniformly under vacuum. Analysis of initial microstructure and composition of fibers was performed using various techniques. All the fibers experienced a steady‐state creep. Primary creep was found to be more or less significant depending on fiber microstructure. Steady‐state creep was shown to result from grain‐boundary sliding. Activation energy and stress exponents were determined. Creep mechanisms are discussed on the basis of activation energy and stress exponent data. Finally, tertiary creep was observed at very high temperatures. Tertiary creep was related to volatilization of SiC. Results are discussed with respect to fiber microstructure.

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Section: Resultsmentioning

confidence: 99%

Tensile Creep Behavior of SiC‐Based Fibers With a Low Oxygen Content

Sauder

Lamon

2007

Journal of the American Ceramic Society

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“…The creep of ␣-SiC with the grain size of 65 m was studied by Krishnamachari and Notis. 11 They attributed the deformation (n ϭ 0.9, Q d ϭ 147 kJ/mol) to Coble creep which occurred by grain-boundary diffusion.…”

Section: Introductionmentioning

confidence: 99%

Compression Deformation Mechanism of Silicon Carbide: I, Fine‐Grained Boron‐ and Carbon‐Doped β‐Silicon Carbide Fabricated by Hot Isostatic Pressing

Shinoda

Yoshida

Akatsu

et al. 2004

Journal of the American Ceramic Society

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The deformation behavior of boron‐ and carbon‐doped β‐silicon carbide (B,C‐SiC) with an average grain size of 260 ± 18 nm containing 1 wt% boron was investigated by compression testing at elevated temperatures. Extensive grain growth during deformation was observed. The stress–strain curves were compensated for grain growth by assuming power‐law type of dependence on grain size and strain rate. The stress exponent n was ∼1.3 and the grain size exponent p was ∼2.7 at temperatures ranging from 1593° to 1758°C. The apparent activation energy of deformation Qd was ∼760 kJ/mol, which was lower than the activation energy for lattice diffusion of silicon and carbon in SiC and higher than that for grain‐boundary diffusion of carbon in SiC. These results suggest that the deformation mechanism of the fine‐grained B,C‐SiC is grain‐boundary sliding accommodated by the grain‐boundary diffusion.

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“…Diffusional creep in polycrystalline SiC occurs by diffusion of carbon [21] or silicon [22] at grain boundaries or within grains [23] or by diffusion of impurities at grain boundaries [24]. Activation energies for diffusion of carbon and silicium within grains in β -SiC made via chemical vapour deposition have been estimated to be 840 [25] and 910 kJ mol −1 [26], respectively.…”

Section: Generalitiesmentioning

confidence: 99%

Review: creep of fibre-reinforced ceramic matrix composites

Lamon

2019

International Materials Reviews

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The content of the review covers, first, generalities on creep. Then, the creep of ceramics and fibres, that are key constituents of fibre-reinforced ceramic matrix composites (CMCs) are addressed. The general features of ceramic matrix composites that may influence the creep behaviour and creep rupture are discussed. Emphasis is placed on microstructure-property relationships and load sharing between fibres and matrix that are critical for CMCs. Then, creep tests and the creep behaviour of various types of fibre-reinforced composites are presented. Mechanisms and models are discussed. The influence of various factors including composite structure, constituent properties (matrix and fibres), interfacial properties and environmental conditions are examined. The paper focuses on non-oxide composites like SiC/SiC that received much attention during the last three decades. Creep of oxide ceramics, fibres and composites are addressed more briefly.

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Interpretation of High-temperature creep of SiC by deformation mapping techniques

Cited by 29 publications

References 10 publications

Tensile Creep Behavior of SiC‐Based Fibers With a Low Oxygen Content

Tensile Creep Behavior of SiC‐Based Fibers With a Low Oxygen Content

Compression Deformation Mechanism of Silicon Carbide: I, Fine‐Grained Boron‐ and Carbon‐Doped β‐Silicon Carbide Fabricated by Hot Isostatic Pressing

Review: creep of fibre-reinforced ceramic matrix composites

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