Phases and Phase Transformations Overview
SYMPOSIUM: Hume-Rothery Symposium: The
Science of Complex Alloys
This symposium, held in honor of the 2005 Hume-Rothery
Award recipient, Uichiro Mizutani, will emphasize both
theoretical and experimental aspects of electronic, structural,
and thermodynamic properties of complex alloy
phases. The invited speakers will provide an assessment
of our current understanding of the structural properties of
complex materials, including quasicrystalline and amorphous
alloys. Special emphasis will be put on our understanding
of why Nature is able to stabilize such complex
atomic arrangements. Most of these structures have been
synthesized by using the Hume-Rothery rule that relates
fundamental aspects of electronic structure to stability.
In recent years, bulk metallic glasses have been synthesized
in many multi-component systems. Here again
there is a need to understand better why metallic glasses
can be stabilized in bulk form within a specific range of
alloy compositions. The above features and more recent
results related to structurally complex alloy phases will
constitute the main theme of this symposium.
SYMPOSIUM: The Armen G. Khachaturyan
Symposium on Phase
Transformation and Microstructural
Evolution in Crystalline Solids
This symposium will honor the remarkable contributions
of Armen G. Khachaturyan to many fields in materials
science in the last 40 years. In particular, his
concentration wave theory of ordering in alloys and
ceramic compounds has provided a bridge between
statistical mechanics of alloys, their symmetry, macroscopic
thermodynamics, and diffraction. This symposium
intends to bring together theoretical, computational
and experimental materials scientists to address
current issues in microstructural evolution during solidstate
reactions and effects of defects (dislocations, surfaces,
interfaces, grain boundaries, et. al.) and external
stress/electrical/magnetic fields. Six sessions are
anticipated including both invited and contributed talks
in each session. Joint sessions are planned with the
symposium on Computational Thermodynamics and
Phase Transformations.
SYMPOSIUM: Phase Stability, Phase
Transformation and Reactive Phase
Formation in Electronic Materials IV
This is the fourth in a series of TMS symposia addressing
the stability, transformation, and formation of
phases during the fabrication, processing, and utilization
of electronic materials and devices. Topics of
interest include: phase stability issues surrounding
microelectronics packaging technology (e.g., stability
of under bump metallizations, interfacial reactions
at solder joints, phase transformations in lead-free
solders during reflow and thermal cycling); phase formation
and integrated circuit technology (e.g., phase
transformations in metal silicide gate materials, phase
stability of contacts and interconnects, and diffusion
barrier materials); and the phase stability and morphological
evolution of novel electronic materials (such as
multicomponent III-V semiconductors, electroceramic
materials, strained layers and superlattices, and self-assembled
structures).
SYMPOSIUM: Phase Transformations Within
Small-Size Systems
PROCEEDINGS: Metallurgical and Materials Transactions
The emphasis of this symposium is on solid-solid
phase transformations that occur within small particles
or matrix grains (as opposed for instance to nanosized
precipitates forming within matrix grains of conventional
or large size). Examples of such size effects
on phase transformations include the size-dependent
extension of solid solubility, alteration of phase boundaries
and phase equilibria, and suppression of spinodal
decomposition and long range ordering. Further
examples include significant changes in the morphology,
nucleation, and growth of diffusional precipitates
and/or martensitic crystals that can occur as a result
of the reduced dimensions of the matrix within which
they form. These size-dependent changes often lead
to novel properties (e.g., retention of ferromagnetism
at the nanoscale). Achieving a fundamental understanding
of matrix (or matrix grain) size effects on the
thermodynamics, kinetics, and mechanisms of phase
transformations is crucial, and significant progress is
beginning to be made in recent years. Emphasis is on
3-dimensional, nano-size particles and matrix grains,
with one or two sessions devoted to thin films (including
electrodeposited materials). Topics to be covered
include: thermodynamics and phase equilibria; spinodal
decomposition; order-disorder transitions; precipitation,
allotropic and displacive transformations;
magnetic and ferromagnetic transitions; nanopowder
metallurgy; devitrifi cation of metallic glass; surface effects
and characterization.
SYMPOSIUM: Multicomponent Multiphase
Diffusion Symposium in Honor of
John E. Morral
Throughout his career, John Morral has dedicated his
work to the understanding and application of multicomponent
diffusion. This symposium, in honor of John
Morral’s 65th birthday, will highlight both experimental
and theoretical work in a variety of multicomponent
multiphase diffusion problems. This work is increasingly
important in improving industrial materials processing
and development. Highlighted topics are to include
diffusion kinetics of high temperature coatings and
processing, zig-zag diffusion paths, internal oxidation,
carburizing, nitriding, and alloy heat treatment.
SYMPOSIUM: Computational Thermodynamics
and Phase Transformations
This symposium is the fourth in a series of annual TMS
symposia focusing on computational thermodynamics
and kinetics of phase transformations. The intent is to
assemble materials scientists in both computational
and experimental disciplines to assess the current
status of computational models and simulation techniques
at different time and length scales. Attention will
be given to the mechanistic fundamentals and practical
applications of phase and microstructure transformation
in advanced materials including metals, ceramics,
and semiconductors. Of particular interest are computational
models that integrate two or more different approaches,
analyses that compare the relative merits of
various simulation techniques, and validation of simulation
results from experimental data.
