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Search Publications by: Carelyn E. Campbell (Fed)

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Displaying 51 - 63 of 63

Diffusivity and Mobility Data

December 31, 2009
Author(s)
Carelyn E. Campbell
Diffusion is the process by which molecules, atoms, ions, point defects, or other particle types migrate from a region of higher concentration to one of lower concentration. The diffusivity of an atom or diffusion coefficient is the rate at which a

Enhanced Mass Transport in Ultra-Rapidly-Heated Ni/Si Thin-Film Multilayers

November 15, 2009
Author(s)
Lawrence P. Cook, Richard E. Cavicchi, Nabil Bassim, Susie Eustis, Winnie Wong-Ng, Igor Levin, Ursula R. Kattner, Carelyn E. Campbell, Christopher B. Montgomery, William F. Egelhoff Jr., Mark D. Vaudin
We have investigated multilayer and bilayer Ni/Si thin films by nano-differential scanning calorimetry (DSC) at ultra rapid scan rates, in a temperature-time regime not accessible with conventional apparatus. DSC experiments were completed at slower scan

Modelling of Thermodynamics and Diffusion in Multicomponent Systems

April 1, 2009
Author(s)
Ursula R. Kattner, Carelyn E. Campbell
The availability of reliable materials data is key to the successful design of materials and manufacturing processes. Commercial alloys rarely consist of only two or three elements, but rather may contain a large number of elements for which the needed

Examination of Multicomponent Diffusion Between Two Ni-Base Superalloys

September 11, 2005
Author(s)
Carelyn E. Campbell, William J. Boettinger, T Hansen, P Merewether, B A. Mueller
The interdiffusion at 1293 degree C between two multicomponent Ni-base superalloys, Rene-N4 and ene-N5, was assessed by measuring the composition vs. distance curves and by comparing the measured curves to predictions obtained using a diffusion mobility

A New Technique for Evaluating Diffusion Mobility Parameters

July 7, 2005
Author(s)
Carelyn E. Campbell
The development and evaluation of a multicomponent diffusion mobility database for Ni-rich alloys are reviewed. In an effort to more directly evaluate the mobility parameters in the database, a method for optimizing the mobility parameters as a function of

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

Transient Liquid-Phase Bonding in the Ni-Al-B System

November 1, 2000
Author(s)
Carelyn E. Campbell, William J. Boettinger
Transient liquid phase (TLP) bonding experiments were performed using a Ni-10.3 at. % Al alloy and a Ni-10 at. %B filler material and the results were compared to simulations performed using the finite-difference diffusion code, DICTRA. For the simulations

On the Properties of Alpha/Alpha + Beta Diffusion Couples

January 1, 2000
Author(s)
William J. Boettinger, Sam R. Coriell, Carelyn E. Campbell, Geoffrey B. McFadden
The properties of diffusion couples in a ternary system are examined theoretically when one end member is composed of single-phase material (alpha) and the other end member is composed of two-phase material (α + Β). Using the model of Morral and co-workers

A Thermodynamic Assessment of the Ni-Al-B System

October 1, 1999
Author(s)
Carelyn E. Campbell, Ursula R. Kattner
The thermodynamics of the Ni-Al-B system are assessed based on available literature data. The ternary assessment included the revision of the Al-B binary description to account for the recent experimental work on the melting properties of AlB 12. The Ni-Al