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Materials

Ceramics

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Displaying 1076 - 1100 of 1323

X-Ray Scattering and Imaging From Plastically Deformed Metals

July 1, 2001
Author(s)
Gabrielle G. Long, Lyle E. Levine, Richard J. Fields
New ultra-small-angle X-ray scattering (USAXS) facilities at 3rd generation synchrotron sources enjoy an additional 1 to 3 decades of X-ray brilliance over 2nd generation instruments, and can now quantify microstructural features from 3nm to 1.3 m in size

OOF: An Image-Based Finite Element Analysis of Material Microstructure

June 1, 2001
Author(s)
Stephen A. Langer, W Carter, Lin-Sien H. Lum
The determination of macroscopic properties of a material given its microscopic structure is of fundamental importance to materials science. We present an overview of two public domain programs which jointly predict macroscopic behavior, starting from an

Solid State Sintering

June 1, 2001
Author(s)
J Blendell
The basic processes which control the solid state sintering of crystalline materials are reviewed. The stages of sintering are described and model which predict the evolution of the microstructure are presented. The effects of dihedral angle and pore

Standard Reference Material 2100: Fracture Toughness of Ceramics

June 1, 2001
Author(s)
George D. Quinn, K Xu, R J. Gettings, J A. Salem, J Swab
New Standard Reference Material (SRM) 2100 is the first reference material in the world for the property fracture toughness for any class material. The SRM is for ceramic fracture toughness and may be used with any ceramic fracture toughness test method

Structural Ceramics Database (Version June 2001)

June 1, 2001
Author(s)
R G. Munro
An update of the NIST Standard Reference Database Number 30, the Structural Ceramics Database, has been completed. This update, designated here as Version June 2001, increases the number of reference citations from 431 to 731, and increases the number of

Using Ab Initio Calculations in the CALPHAD Environment

June 1, 2001
Author(s)
Benjamin P. Burton, N Dupin, S Fries, G Grimvall, A F. Guillermet, P Miodownik, W A. Oates, V Vinograd
Previous Ringberg working groups have discussed possible applications of first principles (FP) calculations to CALPHAD modeling, and have considered the problems from neglect of short range order (SRO) in CALPHAD Gibbs energy models [1]. Particular

Compressive Strengthening of Sapphire by Neutron Irradiation

May 9, 2001
Author(s)
T M. Regan, D C. Harris, R M. Stroud, J R. White, D W. Blodgett, K C. Baldwin, J A. Miragliotta, M E. Thomas, M J. Linevsky, J W. Giles, T A. Kennedy, M Fatemi, David R. Black
Neutron irradiation of sapphire with 1 1022(=1 MeV)/m2 increases the c-axis compressive strength by a factor of 3 at 600 C. The mechanism of strength enhancement is the retardation of r-plane twin propagation by radiation-induced defects. 10B and Cd

Analysis of Stresses in Aluminum-Silicon Alloys

May 1, 2001
Author(s)
A Saigal, Lin-Sien H. Lum
Two-phase aluminum-silicon-based alloys are widely used for premium quality castings for aerospace and automotive applications. While it is clear that silicon improves fluidity in the molten state, providing excellent castability to the alloy, and

Effective Medium Theory of the Porosity Dependence of Bulk Moduli

May 1, 2001
Author(s)
R G. Munro
Effective medium theory is used to obtain a closed form expression for the porosity dependence of the bulk moduli of ceramics. The theory is illustrated with an application to data for high purity alumina that spans a volume fraction of porosity ranging

Correlations Between the Magnetic and Structural Properties of Ca Doped BiMnO 3

April 1, 2001
Author(s)
H Woo, T A. Tyson, Mark Croft, S W. Cheong, Joseph Woicik
Bi1-xCaxMnO3 (BCMO) is known to exhibit charge ordering for a much broader range of x than the classicLa1-xCaxMnO3 (LCMO) system. However, the properties of BCMO over the entire doping range are not well understood. We have performed magnetization and

Difficulties Making Reliability Predictions For Si, GaAs, and Inp

April 1, 2001
Author(s)
Grady S. White, L M. Braun
The lifetime prediction model that has been developed for brittle materials implicitly assumes an initial flaw population from which, under the influence of an applied or residual stress, cracks grow to failure. The relationship between crack growth rate

Porous Thin Films for Thermal Barrier Coatings

April 1, 2001
Author(s)
K D. Harris, D Vick, E J. Gonzalez, T Smy, K Robbie, M J. Brett
A new approach is described in the deposition of thin films for thermal barrier applications. In a physical vapour deposition experiment, extreme shadowing, present only at highly oblique flux/substrate angles, was employed to introduce porosity into thin

The 103rd Annual Meeting of the American Ceramic Society

March 19, 2001
Author(s)
Winnie K. Wong-Ng
The American Ceramic Society 103rd annual meeting & exposition took place from April 22-25, 2001, at the Indiana Convention Center and RCA Dome of Indianapolis. The meeting was well attended - with approximately 2700 attendees including many from other

Phase Diagrams of High Tc Superconductors

March 13, 2001
Author(s)
Winnie K. Wong-Ng
The aim of this chapter is to provide selected experimental phase diagrams of high Tc superconductors to represent various active systems of research. Among current systems, the BaO-Y 2O 3-CuO (BYC), BaO-R 2O 3-CuO (BRC), and BSCCO systems have been

Brittle Fracture Versus Quasi Plasticity in Ceramics: A Simple Predictive Index

March 1, 2001
Author(s)
Y W. Rhee, H W. Kim, Y N. Deng, Brian R. Lawn
Simple relations for the onset of competing brittle and quasi plastic damage modes in Hertzian contact are presented. The formulations are expressed in terms of well-documented material parameters, elastic modulus, toughness and hardness, enabling a priori

Development of Low Cost (Sr,Ca) 3 Al 2 O 6 Dielectrics for Bi 2 Sr 2 CaCu 2 O 8+d Applications

March 1, 2001
Author(s)
T J. Haugan, Winnie K. Wong-Ng, Lawrence P. Cook, Richard G. Geyer, H J. Brown, L Swartzendruber, James A. Kaduk
The development of low-cost (Sr,Ca)3Al2O6 dielectrics for Bi2Sr2CaCu2O8+d superconductor applications was investigated. The (Sr,Ca)3Al2O6 phase was determined to be inert to Bi2Sr2CaCu2O8+d with extended high temperature subsolidus annealing, and also

Thermal Conductivity and Thermal Diffusivity of Selected Oxide Single Crystals

March 1, 2001
Author(s)
A Stanimirovic, N M. Balzaretti, A Feldman, J Graebner
Values for the thermal conductivity k and the thermal diffusivity D of four oxide single crystals have been obtained. Near room temperature the values are: LaAlO 3, k = 0.115 Wcm -1K -1, D = 0.0446 cm 2s -1., NdGaO 3, k = 0.068 Wcm -1K -1, D=0.0197 cm 2s
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