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General Kinetics

  • 48:14 Introduction to Diffusion

    Introduction to Diffusion

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    Diffusion is the migration of atoms. We deal here with the elementary rules of diffusion, including the first and second Fick's laws, solutions to these laws and structure dependent diffusion in the solid-state.Slide:

  • 26:44 Popular Thermodynamics of Diffusion

    Thermodynamics of Diffusion

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    In the first approximation, diffusion is assumed to be driven by gradients in concentration. More accurately, it is driven by gradients in the free energy and there are circumstances in which it can occur against a concentration gradient. The theory for t

  • 23:40 Kinetics: Diffusion-Controlled Growth

    Kinetics: Diffusion-Controlled Growth

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    The one-dimensional growth of a particle, controlled by the rate at which solute diffuses in the parent phase ahead of the product-parent interface, is described. Equations are derived for the simple case of the growth of ferrite from austenite in a binar

  • 30:08 Interface Response Functions

    Interface Response Functions

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    There are many processes which can limit the motion of an interface. For example, the diffusion of solute ahead of the interface, the transfer of atoms across the interface, etc. The functions describing each of these is known as an interface response fun

  • 42:02 Popular Overall Transformation Kinetics

    Overall Transformation Kinetics

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    Phase transformations in the solid state usually occur by a process of nucleation and growth. The theories for these processes are well established. Overall transformation kinetics deals with the evolution of volume fraction of product phase as a function

  • 33:23 Simultaneous transformations: overall transformation kinetics

    Simultaneous transformations: overall transformation kinetics

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    It is often the case that two different phases grow at the same time to consume the same parent phase. In this lecture, Professor Harry Bhadeshia explains a modification of Avrami theory to tackle simultaneous transformations.More information onhttp://www

  • 56:51 Creep Resistant Steels

    Creep Resistant Steels

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    Steels which can serve at very high temperatures ( in excess of 873 K) with tolerable oxidation and sustained strength are of immense use in the efficient generation of electricity. This lecture, delivered at Cambridge University, is about the design of s

  • 27:12 Kinetics: Phase Field Modelling

    Kinetics: Phase Field Modelling

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    In the phase-field method, the state of the entire microstructure isrepresented continuously by a single variable known as the "orderparameter" (phi). For example, phi=1, phi=0 and phi 1 represent the precipitate, matrix and interface respectively. Thelat

  • 45:27 Elementary Thermodynamic Functions

    Elementary Thermodynamic Functions

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    Thermodynamic functions such as heat capacity, internal energy, enthalpy, entropy, free energy are introduced. These concepts are important in many aspects of life, but are described here in the context of phase equilibria.The content should be generally

  • 32:45 Thermodynamic Equilibrium between Solutions

    Thermodynamic Equilibrium between Solutions

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    A solution is an intimate mixture of components. For example, salt (NaCl) dissolved in water is a solution. Another example is a solid solution of carbon in iron. When two solutions are in contact, they may reach equilibrium. This lecture is about equilib

  • 34:27 Popular Thermodynamic Models of Solutions

    Thermodynamic Models of Solutions

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    An ideal solution is one in which the atoms are randomly mixed at all temperatures, whereas in a regular solution the enthalpy of mixing is finite, so that there is a tendency to order or unmix at low temperatures. These and other solution models are cons

  • 30:17 Thermodynamics of Mechanical Alloying

    Thermodynamics of Mechanical Alloying

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    Mechanical alloying is a process in which a metallic solid solution can be produced without melting the constituents. The process begins with large lumps which are attrited into ever smaller particles until there is mixing on an atomic scale. In this lect

  • 27:30 Popular Computer Calculation of Phase Diagrams

    Computer Calculation of Phase Diagrams

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    Thermodynamic models of solutions can be used together with data to calculate phase diagrams. These diagrams reveal, for a given set of parameters (such as temperature, pressure, magnetic field), the phases which are thermodynamically stable and in equili

  • 29:37 Thermodynamics of Irreversible Processes

    Thermodynamics of Irreversible Processes

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    The thermodynamics of irreversibleprocesses deals with systems which are not at equilibrium but are nevertheless stationary. The theory in effect uses thermodynamics to deal with kinetic phenomena.The content should be generally useful to scientists. This

  • 17:20 Thermodynamics: Quasichemical Solution Model

    Thermodynamics: Quasichemical Solution Model

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    A quasichemical solution model deals properly with a finite enthalpy of mixing, in that the distribution of atoms is NOT assumed to be random. In contrast, a regular solution model is based on a finite enthalpy of mixing but nevertheless assumes incorrect