Mechanisms of pore formation in high-temperature carbides: Case study of TaC prepared by spark plasma sintering

Kelly, James; Graeve, Olivia A.

doi:10.1016/j.actamat.2014.11.005

Cited by 53 publications

(46 citation statements)

References 83 publications

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“…The trend line is similar to the one that has been attained by Antou et al [29] via finite element simulation, as well as Kelly and Graeve through conducting SPS runs with both top and side pyrometers attached [40]. Additionally, the extrapolation of the obtained relationship has been demonstrated to be able to predict the specimen’s temperature when higher SPS temperature is imposed (dashed extension line).…”

Section: Discussionsupporting

confidence: 81%

Zirconium Carbide Produced by Spark Plasma Sintering and Hot Pressing: Densification Kinetics, Grain Growth, and Thermal Properties

et al. 2016

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Spark plasma sintering (SPS) has been employed to consolidate a micron-sized zirconium carbide (ZrC) powder. ZrC pellets with a variety of relative densities are obtained under different processing parameters. The densification kinetics of ZrC powders subjected to conventional hot pressing and SPS are comparatively studied by applying similar heating and loading profiles. Due to the lack of electric current assistance, the conventional hot pressing appears to impose lower strain rate sensitivity and higher activation energy values than those which correspond to the SPS processing. A finite element simulation is used to analyze the temperature evolution within the volume of ZrC specimens subjected to SPS. The control mechanism for grain growth during the final SPS stage is studied via a recently modified model, in which the grain growth rate dependence on porosity is incorporated. The constant pressure specific heat and thermal conductivity of the SPS-processed ZrC are determined to be higher than those reported for the hot-pressed ZrC and the benefits of applying SPS are indicated accordingly.

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Section: Discussionsupporting

confidence: 81%

Zirconium Carbide Produced by Spark Plasma Sintering and Hot Pressing: Densification Kinetics, Grain Growth, and Thermal Properties

et al. 2016

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“…Additional details on the SPS process can be found elsewhere. [21][22][23][24][25] Phase development/devitrification of the samples was characterized by X-ray diffraction (Ultima IV, Rigaku, Japan) using CuKα radiation, a step size of 0.02 degrees 2θ, a count time of 1 s, and scanning from 20 to 80 degrees 2θ. Densities of the samples were evaluated by the Archimedes method using a Mettler Toledo Density Kit (Mettler Toledo, Columbus, OH).…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties of an Fe‐Based SAM2×5‐630 Metallic Glass Matrix Composite with Tungsten Particle Additions

et al. 2018

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We present the role of tungsten additions on the mechanical properties of a Fe-based structural amorphous metal (SAM2Â5-630) containing crystalline tungsten. Matrix cracking by microindentation is inhibited by the addition of tungsten and indicates that tungsten improves the fracture toughness. Response surfaces from nanoindentation arrays indicate that the hardness and modulus of the matrix phase are increased by tungsten additions. Bulk composites with 30 vol% tungsten subjected to 4-point flexure exhibited brittle fracture behavior and the characteristic strength and Weibull modulus were 165 and 8.7 MPa, respectively. The addition of tungsten did not cause devitrification of the matrix phase.

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“…While numerous methods to measure mechanical properties of macroscale samples exist, standard testing procedures are often impossible to implement for marginal metallic glass formers because processing limits the sample sizes that can be obtained of these materials. Spark plasma sintering [9][10][11] can overcome this sample size issue for some marginal glass formers so that macroscale properties can be measured [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Bulk Mechanical Properties Testing of Metallic Marginal Glass Formers

Phan

Kelly

Kassner

et al. 2016

Journal of Metallurgy

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We developed a unique three-point bend testing apparatus to measure bulk mechanical properties of a model metallic glass alloy (SAM2X5 with nominal composition Fe 49.7 Cr 17.1 Mn 1.9 Mo 7.4 W 1.6 B 15.2 C 3.8 Si 2.4 ) prepared by spark plasma sintering. The relatively large sample sizes in the present work allowed for the preparation of test specimens with a macroscale cross section (in the millimeter range) with well-controlled sample dimensions closer to standardized tests. Wire saw cutting allowed for a relatively sharp notch radius (3x smaller than previous studies) and minimal sample damage. We determined that Young's modulus and notch fracture toughness measured by our three-point bending apparatus are 230 GPa and 4.9 MPa⋅m 1/2 . Also, Vickers indentation and flexure testing provided consistent results for Young's modulus. Indentation fracture toughness measured by Vickers indentation produced values at least 50% lower than by flexure. The microscale mechanical properties testing technique presented in this work and subsequent analyses are applicable to specimens of other compositions or ones prepared by other methods.

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Mechanisms of pore formation in high-temperature carbides: Case study of TaC prepared by spark plasma sintering

Cited by 53 publications

References 83 publications

Zirconium Carbide Produced by Spark Plasma Sintering and Hot Pressing: Densification Kinetics, Grain Growth, and Thermal Properties

Zirconium Carbide Produced by Spark Plasma Sintering and Hot Pressing: Densification Kinetics, Grain Growth, and Thermal Properties

Mechanical Properties of an Fe‐Based SAM2×5‐630 Metallic Glass Matrix Composite with Tungsten Particle Additions

Bulk Mechanical Properties Testing of Metallic Marginal Glass Formers

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