# CBEMS 65B Diffusion in Materials (2017-2018)

#### CBEMS 65B Diffusion in Materials

**CBEMS 65B Diffusion in Materials (Credit Units: 4)** Introduction to mass transfer in solids. Models of diffusion and the treatment of steady-state and non-steady state diffusion phenomena and ion-migration. Mechanisms controlling the kinetics of diffusion and the role of material structure and point defects. Diffusion in binary systems and the Kirkendall effect. Prerequisite: CBEMS 65A . Materials Science Engineering majors have first consideration for enrollment. Only one course from CBEMS 65B, CBEMS 45C, ENGRMAE 115 may be taken for credit. (Design units: 0)

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1. Be able to describe the relationships between point defects and the role of diffusion in materials.

2. Be able to solve basic problems involving steady-state and non-steady-state diffusion phenomena.

3. Be able to describe the driving forces for solid-state diffusion, and the application of such knowledge to materials design and engineering materials processing.

4. Be able to describe the Kirendall effect, and its implications for materials properties and performance.

General chemistry and general physics, Use of units and significant figures

- Fundamental Concepts of Diffusion and Solid-State Mass transfer
- Diffusion of Gases into and out of Solids
- Diffusion into a Semi-Infinite Solid from a Thin Planar Source
- Diffusion Between Semi-Infinite Sources
- The Diffusion Coefficient and Random-Walk Processes

- Defects in Solids
- Experimental Methods
- Thermodynamics of Simple Defects

- Solid State Diffusion
- Fick’s First Law
- Fick’s Second Law
- Kirkendall Effect
- Mobility
- Temperature Dependence of Diffusion

- Driving Forces and Fluxes for Diffusion
- Atomic Models for Diffusion and Diffusion Mechanisms
- Diffusion in Metals and Alloys
- Diffusion in Ionic Crystals
- Diffusion in Non-Crystalline Solids
- Diffusion along Crystal Imperfections and High-Diffusivity Paths
- Mass Transport and Morphological Evolution
- Diffusion-Based Surface Evolution
- Coarsening
- Diffusional Creep
- Sintering
- Temperature Dependence of Diffusion

Meets for 3 hours of lecture and 1 hour of discussion each week for 10 weeks.

Computer literacy and basic skills are required for performing analysis using software.

None

Provides students with an understanding of the principles governing kinetic phenomena in the solid state, and the thermodynamic and kinetic underpinnings of materials evolution through diffusional processes.

- Homework: 10%
- Quizzes: 20%
- Midterm Exam: 35%
- Final Exam: 35%
- Total: 100%

Mathematics and Basic Science: 0.0 credit units

Computing: 0.0 credit units

Engineering Topics: 4.0 credit units

Engineering Science: 4.0 credit units

Engineering Design: 0.0 credit units