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Materials

Ceramics

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Displaying 1076 - 1100 of 1326

DTA/TGA Study of Eutectic Melting in the System BaF 2 -BaO-Y 2 O 3 -CuO x -H 2 O

July 1, 2001
Author(s)
Lawrence P. Cook, Winnie K. Wong-Ng, J Suh
Differential thermal analysis and thermogravimetric analysis (DTA/TGA) experiments have been completed in the BaF2-BaO-Y2O3-CuOx-H2O system at various oxygen pressures to determine the effect of adding BaF2 and H2O on the eutectic melting in the system BaO

Static and Dynamic Properties of Stretched Water

July 1, 2001
Author(s)
P A. Netz, Francis W. Starr, H E. Stanley, M C. Barbosa
We present the results of molecular dynamics simulations of the extended simple point charge (SPC/E) model of water to investigate the thermodynamic and dynamic properties of stretched and supercooled water. We locate the liquid-gas spinodal, and confirm

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
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