Lecture 8: Surface tension, internal pressure and energy of a spherical
particle or droplet
Todays topics
Understand what is surface tension or surface energy, and how this balances with the
internal
Lecture 15: Kinetics of Phase Growth: single-component or
composition-invariant transformation
Todays topics
Derivation of the Johnson-Mehl-Avrami equation: the time constant () of phase growth
and th
Lecture 16: Kinetics of Phase Growth in a Two-component System:
dilute-solution approximation
Todays topics
Kinetics of phase growth (transformation) in a two-component system: atom A and B form
two p
Lecture 18: Kinetics of Phase Growth in a Two-component System:
general kinetics analysis based on the dilute-solution approximation
Todays topics:
In the last 2 Lectures, we learned three different w
Lecture 17: Kinetics of Phase Growth in a Two-component System:
description of diffusion flux across the / interface
Todays topics
Major tasks of todays Lecture: how to derive the diffusion flux of at
Lecture 19: Eutectoid Transformation in Steels: a typical case of Cellular
Precipitation
Todays topics
Understanding of Cellular transformation (or precipitation): when applied to phase
transformation
Lecture 14: Rate of Nucleation
Todays topics
Two energetic factors that affect nucleation rate: the activation energy barrier (G*) that
needs to be overcome to produce a critical-size nucleus, and the
Lecture 21: Types of Interfaces: coherent, semi-coherent, and incoherent
Todays topics
Basics of the three types of interfaces: coherent, semi-coherent, and incoherent, and the
major differences betwe
Lecture 20: Eutectoid Transformation in Steels: kinetics of phase growth
Todays topics
The growth of cellular precipitates requires the portioning of solute to the tips of the
precipitates in contact
Lecture 22: Spinodal Decomposition: Part 1: general description and
practical implications
Todays topics
basics and unique features of spinodal decomposition and its practical implications.
The relati
Lecture 26: Diffusion of Ions: Part 1: basic understanding and the
derivation of diffusion flux
Todays topics
Understanding of the fundamental differences between a solution (solid or liquid) consisti
Lecture 23: Spinodal Decomposition: Part 2: regarding free energy
change and interdiffusion coefficient inside the spinodal
Todays topics
Continue to understand the basic kinetics of spinodal decompos
Lecture 27: Diffusion of Ions: Part 2: coupled diffusion of cations and
anions as described by Nernst-Planck Equation
Todays topics
Continue to understand the fundamental kinetics parameters of diffus
Lecture 25: Ordering Transformation
Todays topics
Understanding of the concepts of ideal solution, regular solution and real solution, and
comparison of the mixing thermodynamics between them regardin
Lecture 24: Spinodal Decomposition: Part 3: kinetics of the
composition fluctuation
Todays topics
Diffusion kinetics of spinodal decomposition in terms of the concentration (composition)
fluctuation a
Lecture 28: Kinetics of Oxidation of Metals: Part 1: rusting, corrosion, and
the surface protection, all about chemistry
Todays topics
Chemical processes of oxidation of metals: the role played by oxy
Lecture 29: Kinetics of Oxidation of Metals: Part 2: Wagner Parabolic
Model
Todays topics
Oxidation of metals: controlled by both the ionic diffusion (carried by M+2 and O-2) and the
electronic diffus
Lecture 12: Heterogeneous Nucleation: a surface catalyzed process
Todays topics
What is heterogeneous nucleation? What implied in real practice of materials processing
and phase transformation?
Hetero
Lecture 11: Homogeneous Nucleation: solid-solid phase transformation
Todays topics
Homogeneous nucleation for solid-solid phase transformation, and the major difference
compared to the liquid-solid ph
Lecture 13: Heterogeneous Nucleation: Effects of Grain Boundaries and
Surface Defects
Todays topics
Effects of grain boundaries on solid-solid phase transformation: various types of grain
boundaries.
Lecture 2: Kinetics: as described as transformation rate between two
equilibrium states
Todays topics
As we learned in last Lecture: Rate (Kinetic factor) (Thermodynamic factor). In this
Lecture we wi
Name:
Homework for Lecture 1, 2
1. For a reaction A + B C, the Gibbs free energy change (G) is -100 kJ mol-1. Considering the
reaction temperature in the range of 300 1000 K, discuss whether the react
Name:
Homework for Lecture 10, 11, 12
A liquid metal ( phase) is contained in a container ( phase). Assume the melting point of the
metal is Tm = 1500 K, the molar heat of melting is HM = HL0 HS0= 160
Name:
Homework for Lecture 4
Suppose there are two frogs waiting at the two ends of a feeding tube of length l. Now we feed the
frogs by putting insects into the tube from an open slot located at a po
Name:
Homework for Lecture 5
Consider a binary solution of A and B with the concentration of XA=0.20. Assuming the Henry
activity coefficient (A) of A in this binary solution is given by
ln A = 0.50 X
Name:
Homework for Lecture 6, 5
Consider a binary solution of A and B with the concentration of XA=0.4. The free energy of this
binary solution is given by =
G G 0 + RT ( X A X B ) . Suppose the trace
Name:
Homework for Lecture 3
Consider an atom diffuses in a 3D simple cubic lattice by a random walk mechanism. The atom
jumps 10-5 times per second at 300K and 104 times per second at 600K.
1). How m
Lecture 3: Diffusion: Ficks first law
Todays topics
What is diffusion? What drives diffusion to occur?
Understand why diffusion can surprisingly occur against the concentration gradient?
Learn how to
Lecture 2: Kinetics: as described as transformation rate between two
equilibrium states
As we learned in last Lecture: Rate (Kinetic factor) (Thermodynamic factor). In this
Lecture we will further des
Lecture 1: Kinetics vs. Thermodynamics: different but related
Todays topics
The basic concepts of Kinetics and Thermodynamics, and how to understand the
difference and inter-relationship between the t