金屬材料

預錄：課綱說明：授課進度、報告、小考、課本介紹  課本的三個版本的介紹  各章節間的關係、授課考試進度  銜接本課程的系上其他課程與線上資源  美國工程學院講座  https://livestream.com/accounts/7036396/events/9376606/videos/213107047 9/10: 學期初問卷

Chapter 1: Thermodynamics and Phase Diagrams – 1  Equilibrium & Entropy  Gibbs free energy  Steady state  Metastable  Le Chatelier‘s principle  Intensive vs. extensive  Temperature effects on single component system

Chapter 1: Thermodynamics and Phase Diagrams – 1  Pressure effects on single component system  Driving force for solidification  Binary system: ideal solution: Temperature effects Chapter 1: Thermodynamics and Phase Diagrams – 2 （預錄）  Binary system: Chemical potential, regular solution  Exothermic & Endothermic

Chapter 1: Thermodynamics and Phase Diagrams – 2  Activity  Real solution  Characterizations  Heterogeneous systems  Binary phase diagram  Miscibility gap  Phase diagram containing intermediate phases

Chapter 1: Thermodynamics and Phase Diagrams – 3  Vacancy  Phase rule  Kinetics

Chapter 2: Diffusion-1  Definitions  Applications & Diffusion directions  Models to describe diffusions  Interstitial diffusion  Thermal activation  Temperature effects  Fick’s 1st & 2nd Laws

Chapter 2: Diffusion-2  Substitutional diffusion  Self-diffusion  Diffusion coefficient  How to measure  Kirkendal effect & Darken’s equation  Atomic mobility  High-diffusivity paths

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Chapter 3: Crystal Interfaces and Microstructure-1  Three interfaces  Interfacial energy derivation  Solid/Vapor interface & FCC example  Grain-boundary-migration Driving Forces  Nucleation & Growth  Grain boundary: Single-phase Interface  Special grain boundary

Chapter 3: Crystal Interfaces and Microstructure-2  Grain boundary migration  Alloy effects  Kinetics of grain growth  Solid/liquid interface  Interphase interfaces: coherent, incoherent, semicoherent  Second phase shape  Glissile interface  Interface migration

Chapter 4: Solidification-1  Additive manufacturing for solidification  Recall Chapter 3  Nucleation in pure metals  Homogeneous nucleation  Nucleation rate  Heterogenous nucleation  Nucleation at melting  Growth of a pure solid  Continuous growth  Lateral growth

Chapter 4: Solidification-2  Heat flow  Supercooled & Dendritic growth  Alloy solidification  Perfect mixing in liquid  Diffusional mixing in liquid  Constitutional supercooling  Cellular & dendritic solidification  Eutectic solidification  Ingot structure

Chapter 5: Diffusional Transformation in Solids  Review chapters for Ch. 5  Introduction  Precipitation  Homogenous nucleation  Nucleation rate in homogeneous precipitation  Nose shaped curve of nucleation rate for homogenous precipitation  Solute amounts in the alloys  Heterogeneous nucleation  Rate if heterogeneous nucleation  Precipitate growth & shape  Growth behind planar incoherent interfaces  TTT diagram

複習本學期的第三、四、五章; 助教講解課本習題作業

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