Micromechanisms of deformation in high-purity hot-pressed alumina

Staehler, James M.; Predebon, William W.; Pletka, B. J.; Subhash, Ghatu

doi:10.1016/s0921-5093(00)00976-x

Cited by 48 publications

(31 citation statements)

References 29 publications

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“…Sintered or hot pressed alumina is commercially available in a wide range of purities, with strength increasing with increasing purity. Some very high flexural, tensile and compressive strength values have been reported in the literature for carefully prepared aluminas, produced from high-purity powders, with low porosity, small grain size, and lacking the glassy grain boundary phases typically present in commercially supplied alumina [135,[151][152][153]. These materials are not representative of commercially available alumina, and so are not included here.…”

Section: Flexural Strengthmentioning

confidence: 99%

A review of the processing, composition, and temperature-dependent mechanical and thermal properties of dielectric technical ceramics

et al. 2011

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The current review uses the material requirements of a new space propulsion device, the Variable Specific Impulse Magnetoplasma Rocket (VASIMR ® ) as a basis for presenting the temperature dependent properties of a range of dielectric ceramics, but data presented could be used in the engineering design of any ceramic component with complementary material requirements. A material is required for the gas containment tube (GCT) of VASIMR ® to allow it to operate at higher power levels. The GCT's operating conditions place severe constraints on the choice of material. A dielectric is required with a high thermal conductivity, low dielectric loss factor, and high thermal shock resistance. There is a lack of a representative set of temperature-dependent material property data for materials considered for this application and these are required for accurate thermo-structural modelling. This modelling would facilitate the selection of an optimum material for this component. The goal of this paper is to determine the best material property data values for use in the materials selection and design of such components. A review of both experimentally and theoretically-determined temperature-dependent & room temperature properties of several materials has been undertaken. Data extracted are presented by property. Properties reviewed are density, Young's, bulk and shear moduli, Poisson's ratio, tensile, flexural and compressive strength, thermal conductivity, specific heat capacity, thermal expansion coefficient and the factors affecting maximum service temperature. Materials reviewed are alumina, aluminium nitride, beryllia, fused quartz, sialon and silicon nitride.

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Section: Flexural Strengthmentioning

confidence: 99%

A review of the processing, composition, and temperature-dependent mechanical and thermal properties of dielectric technical ceramics

et al. 2011

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“…In spite of the wealth of literature [1][2][3][4][5][6], however, many issues in compressive failure of alumina especially at high strain rates [7][8][9][10][11]] remain yet to be resolved. Firstly, it is to be known with certainty, how microcracks grow under compression [12][13][14][15]. Secondly, it is not yet clear, how the omnipresent processing flaws play a role in the initiation, incubation and growth of the microcracks in the states of uniaxial and/or multi-axial compressive loading [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Also, it is yet to be clearly deciphered the amount of interaction that depends on processing history and schedule and the resultant grain size, grain boundary phase composition, etc. of a given ceramic e.g., alumina [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Deformation and failure of alumina under high strain rate compressive loading

Acharya

Bysakh

Parameswaran

et al. 2015

Ceramics International

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“…Strainrate dependence of the Al 2 O 3 fiber strength is generally regarded as being very low as reported by Cady and Gray [3]. It may be noted parenthetically that Staehler et al reported very strong rate sensitivity for a pure form of pure hot pressed alumina [20], however, that is not believed to be the case here.…”

Section: Discussionmentioning

confidence: 44%

Quasi-static and high strain rate properties of a cross-ply metal matrix composite

Hall

Taşdemirci

Derrick

2009

Materials Science and Engineering: A

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a b s t r a c tA series of compression tests has been carried out at quasi-static and high strain rates on cylindrical samples of an alumina fiber/Al-6061 metal matrix composite. The composite plates were prepared with fibers in the 0• , 0/90 • and ±45• orientations. It was found that the mechanical properties were strongly dependent upon the imposed strain rate, with fracture stress increases of >50% being noted for several orientations at high strain rates: these increases are not believed to be related to strain rate sensitivity of either the matrix or fibers but to arise from the inertia of fragments which remain in place after fracture and continue to bear load. Also, and in contradiction to behavior anticipated from the rule of mixtures, it was found that 0/90• samples exhibited properties superior to those of 0 • unidirectional samples. Highspeed photography was used to confirm the sequence of deformation and fracture events at high strain rate.

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Micromechanisms of deformation in high-purity hot-pressed alumina

Cited by 48 publications

References 29 publications

A review of the processing, composition, and temperature-dependent mechanical and thermal properties of dielectric technical ceramics

A review of the processing, composition, and temperature-dependent mechanical and thermal properties of dielectric technical ceramics

Deformation and failure of alumina under high strain rate compressive loading

Quasi-static and high strain rate properties of a cross-ply metal matrix composite

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