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Displaying 1 - 25 of 160

Effect of Vacancy Creation and Annihilation on Grain Boundary Motion

January 15, 2020
Author(s)
Geoffrey B. McFadden, William J. Boettinger, Yuri Mishin
The interaction of vacancies with grain boundaries (GBs) is involved in many processes occurring in materials, including radiation damage healing and diffusional creep. We analyze a model describing a set of processes occurring at a GB in the presence of a

John Werner Cahn

September 15, 2019
Author(s)
William J. Boettinger, C A. Handwerker, Frank W. Gayle
John Werner Cahn, retired Senior Fellow of the National Institute of Standards and Technology (NIST), died in Seattle, WA on March 14, 2016 at age 88. After distinguished careers at General Electric in Schenectady, N.Y. (1954-1964) and at MIT (1964-1978)

Solidification of Ni-Re Peritectic Alloys

February 4, 2019
Author(s)
William J. Boettinger, Dale E. Newbury, Nicholas W. Ritchie, Maureen E. Williams, Ursula R. Kattner, Eric Lass, Kil-Won Moon, Michael B. Katz
Differential thermal analysis (DTA) and microstructural and microprobe measurements of DTA and as-cast Ni-Re alloys with compositions between 0.20 and 0.44 mass fraction Re provide information to resolve differences in previously published Ni-Re phase

Interdiffusion in the Ni-Re System: Evaluation of Uncertainties

June 23, 2017
Author(s)
William J. Boettinger, Maureen E. Williams, Kil-Won Moon
Diffusion couple experiments between Ni and Re at 1200°C and 1350°C were performed. These experiments established the limits of the two-phase FCC + HCP region. No intermediate phase was observed at these temperatures. Composition dependent interdiffusion

Diffusion in FCC Co-Al-W Alloys at 900 degree C and 1000 degree C

August 17, 2016
Author(s)
Kil-Won Moon, Carelyn E. Campbell, Maureen E. Williams, William J. Boettinger
Diffusion couple experiments between various Co-rich face centered cubic alloys in the Co-W-Al ternary system have been conducted at 900 degree C and 1000 degree C. Diffusion coefficients have been extracted for the Co-W binary and for ternary alloys at

On the Solidification of Multicomponent Alloys

February 1, 2016
Author(s)
William J. Boettinger
Various topics taken from the author's research portfolio that involve multicomponent alloy solidification will be reviewed. Topics include: ternary eutectic solidification and Scheil-Gulliver paths in ternary systems. A case study of the solidification of

Sharp interface model of creep deformation in crystalline solids

June 30, 2015
Author(s)
Yuri Mishin, Geoffrey B. McFadden, Robert F. Sekerka, William J. Boettinger
We present a rigorous irreversible thermodynamics treatment of creep deformation of solid mate- rials with interfaces described as geometric surfaces capable of vacancy generation and absorption and moving under the influence of local thermodynamic forces

Solidification

December 19, 2014
Author(s)
William J. Boettinger, Dilip K. Banerjee
In this chapter, we give a general view of the formation of the solid from its melt. This process is generally driven by the extraction of heat from the melt but fluid flow has a major influence on solidification. Thus an early section deals with transport

Irreversible thermodynamics of creep in crystalline solids

November 15, 2013
Author(s)
Yuri Mishin, James A. Warren, Robert F. Sekerka, William J. Boettinger
We develop an irreversible thermodynamics framework for the description of creep deformation in crystalline solids by mechanisms that involve vacancy diffusion and lattice site generation and annihilation. The material undergoing the creep deformation is

A diffuse-interface Model of Reactive Wetting with Intermetallic Formation

May 1, 2012
Author(s)
Walter Villaneuva, William J. Boettinger, Geoffrey B. McFadden, James A. Warren
A diffuse-interface model of reactive wetting with intermetallic formation is developed that incorporates fluid flow, phase change, and solute diffusion. The model is based on the total molar Gibbs energy of a ternary system with four phases. Numerical