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Search Publications by: Ursula R. Kattner (Fed)

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Displaying 51 - 75 of 83

Alloy Selection

October 16, 2008
Author(s)
C A. Handwerker, Ursula R. Kattner, Kil-Won Moon, J Bath, E -. Bradley, P Snugovsky
In this chapter, the key results and analyses leading to the choice of tin-silver-copper alloys by NEMI as the new national standard Pb-free solder system are discussed in detail. These include data on phase transformations in solders (including melting

The Effect of Bi Contamination on the Solidification Behavior of Sn-Pb Solders

October 16, 2008
Author(s)
Kil-Won Moon, Ursula R. Kattner, C A. Handwerker
This paper presents experimental results and theoretical calculations that evaluate the effects of Bi contamination on the solidification behavior of Sn-Pb alloys. The pasty (mushy) range, the type of solidification path, and the microstructure of the

Thermodynamic Assessment of the Co-Mo System

October 16, 2008
Author(s)
Albert Davydov, Ursula R. Kattner
The experimental thermochemical and phase diagram data for the Co-Mo system were assessed. A consistent thermodynamic description, using a Redlich-Kister model for the solution phases and sublattice and line compound models for the intermetallics, was

Efficient Phase Diagram Information and Computational Thermodynamics

April 28, 2006
Author(s)
Ursula R. Kattner
Industries that process and use metals, from microelectronics to aerospace, can use phase equilibria data for complex alloys (three or more components) and diffusion data for controlling the formation and dissolution of precipitate phases within a matrix

Contribution to the Zn-Rich Part of the Zn-Zr Phase Diagram

August 11, 2004
Author(s)
Maureen E. Williams, William J. Boettinger, Ursula R. Kattner
The reaction of zinc vapor with Zircaloy-4 and nuclear grade zirconium was investigated with various analytical techniques: optical metallography, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction. Based on

Databases for Computational Thermodynamics and Diffusion Modeling

October 1, 2003
Author(s)
Ursula R. Kattner, J E. Morral, William J. Boettinger
tabases for computational thermodynamics and diffusion modeling can be applied to the prediction of phase diagrams and microstructural evolution. These can be used for alloy and process design as well as to improve modeling capabilities that would decrease

Revised Thermodynamic Description for the Co-Mo System

June 1, 2003
Author(s)
Albert Davydov, Ursula R. Kattner
The previously assessed Co-Mo system (1999Dav) has been partially revised: thermodynamic descriptions for the liquid, , ς and bcc phases were amended in the attempt to eliminate some unrealistic phase diagram features, such as inverse liquid miscibility

Phase Diagrams for Lead-Free Solder Alloys

December 1, 2002
Author(s)
Ursula R. Kattner
The need for new improved solder alloys and better understanding of reactions during the soldering process grow steadily as the need for smaller and more reliable electronic products grows. A candidate solder alloy needs to fulfill basic requirements

Database for Computational Thermodynamics and Diffusion Modeling Workshop Report

November 1, 2002
Author(s)
Ursula R. Kattner, William J. Boettinger, J E. Morral
Databases for computational thermodynamics and diffusion modeling can be applied to predict phase diagrams for alloy design and alloy behavior during processing and service. Databases that are currently available to scientists, engineers and students need

Use of Thermodynamic Software in Process Modelling and New Applications of Thermodynamic

July 1, 2002
Author(s)
Ursula R. Kattner, G Eriksson, I Hahn, R Schmid-fetzer, Bo Sundman, V Swamy, A Kussmaul, P J. Spencer, T J. Anderson, T G. Chart, A Costa e Silva, B Jansson, B J. Lee, M Schalin
The strongly related nature of the topics allocated to Groups 4 and 5 was such that a close interaction between the two groups appeared essential at all stages of the discussions and for this reason the groups amalgamated. A joint decision was made as to

On Differential Thermal Analyzer Curves for the Melting and Freezing of Alloys

June 1, 2002
Author(s)
William J. Boettinger, Ursula R. Kattner
A model for the response of differential thermal analysis measurement techniques to melting and freezing is explored. The model, which uses a system of ordinary differential equations, predicts sample, sample cup and thermocouple temperature histories

Applications of Computational Thermodynamics

February 1, 2002
Author(s)
J Agren, F H. Hayes, LFJ H. Hoglund, Ursula R. Kattner, B Legendre, R Schmid-fetzer
The major tools used in applying computational thermodynamics to various problems in materials science are briefly presented and several practical examples are given as illustrations. Solutions to industrial problems pertaining to the processing of and

Development of a Diffusion Mobility Database for Ni-Base Superalloys

February 1, 2002
Author(s)
Carelyn E. Campbell, William J. Boettinger, Ursula R. Kattner
For a wide variety of Ni-base superalloy applications, including solidification, homogenization, y precipitation, bonding and repairing processes, and protective bond coats, multicomponent diffusion data are needed. Thus, in the Ni-Al-Co-Cr-Hf-Mo-Re-Ta-Ti

Thermodynamic Assessment of the Gallium - Nitrogen System

November 1, 2001
Author(s)
Albert Davydov, William J. Boettinger, Ursula R. Kattner, T J. Anderson
Thermochemical and phase diagram data for the Ga-N system were assessed by employing the CALPHAD method. A consistent model representation of available thermodynamic properties agrees well with the critically evaluated experimental data. Thermodynamic

Moving the Pulsed Heating Technique Beyond Monolithic Specimens: Experiments with Coated Wires

August 1, 2001
Author(s)
Daniel Josell, D Basak, J L. McClure, Ursula R. Kattner, Maureen E. Williams, William J. Boettinger, M Rappaz
Pulsed heating experiments based on pyrometric measurement of the temperature-time history of metal specimens rapidly heated by passage of electric current have a thirty year history at NIST. In recent years, efforts have been made to move beyond the

Calculation of Phase Equilibria in Candidate Solder Alloys

July 1, 2001
Author(s)
Ursula R. Kattner, C A. Handwerker
New solder alloys are being developed for electronic assemblies as replacements for traditional Pb-containing solder materials as a result of international pressure to remove Pb from the waste stream. In the transition period from Pb-containing to Pb-free