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MSE 227: Introduction to Materials Science & Engineering

MSE 227: Introduction to Materials Science & Engineering. Course Objective. Introduce fundamental concepts in MSE. You will learn about:. • material structure. • how structure dictates properties. • how processing can change structure. This course will help you to:.

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MSE 227: Introduction to Materials Science & Engineering

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  1. MSE 227: Introduction to Materials Science & Engineering Course Objective... Introduce fundamental concepts in MSE You will learn about: • material structure • how structure dictates properties • how processing can change structure This course will help you to: • use materials properly • realize new design opportunities with materials

  2. Time: T/Th 9:30 – 10:45 AM, 11:00-12:15 PM Room: JD3504 Instructor: Dr. Dale Conner Dept. of Manufacturing System Engineering and Management Office: JD3511, (818) 677-4730 Office Hour: T, Th: 12:30-1:30 PM 6:00 – 6:45 PM Email: rdconner@csun.edu

  3. Prerequisites: CHEM 101, PHYS220A, PHYS220AL Corequisites: MATH 150B. Textbook: Fundamentals of Materials Science and Engineering, 3nd Ed. 2008. W.D. Callister, Jr. J. Wiley & Sons, NY Last day to drop without approval: Sept. 12, 2008 Course Description: An introductory course in engineering materials including metals, ceramics, polymers, and composites. Study of atomic and crystalline structures of materials. Application of basic principles to the study of mechanical, physical, and chemical behavior of materials. Selection of materials in engineering applications based on materials properties and processing. Design project on materials properties, selection or application. The learning objectives are: To understand the principles of engineering and science in applications of materials and design. To learn to find information in literature and other available sources. To learn to use information systems (computer, internet, and other available sources) in engineering practice.

  4. Grading Policy Quizzes 15.0 % Mid-term Exam 40 % Term papers 15 % Final Exam 30% Methods of Students evaluation: Two class examinations and a final examination. Weekly quizzes and worksheets A written report on a material of interest: Outline due: November 13, 2008, with a list of at least six references. Project due: December 9, 2008.

  5. The Materials Science Mantra: The properties of a material depend upon its compositionand microstructure The microstructure of a material depends upon its composition and the processing that it undergoes

  6. Chapter 1 Materials are... engineered structures...not blackboxes! Structure...has many dimensions... Structural feature Dimension (m) -10 < 10 atomic bonding -10 missing/extra atoms 10 -8 -1 crystals (ordered atoms) 10 -10 second phase particles -8 -4 10 -10 crystal texturing -6 > 10 1

  7. Structure, Processing, & Properties • Properties depend on structure ex: hardness vs structure of steel Data obtained from Figs. 10.21(a) and 10.23 with 4wt%C composition, and from Fig. 11.13 and associated discussion, Callister 6e. Micrographs adapted from (a) Fig. 10.10; (b) Fig. 9.27;(c) Fig. 10.24; and (d) Fig. 10.12, Callister 6e. Hardness (BHN) • Processing can change structure ex: structure vs cooling rate of steel 2

  8. The Materials Selection Process 1. Pick Application Determine required Properties Properties: mechanical, electrical, thermal, magnetic, optical, deteriorative. 2. Properties Identify candidate Material(s) Material: structure, composition. 3. Material Identify required Processing Processing: changes structure and overall shape ex: casting, sintering, vapor deposition, doping forming, joining, annealing. 3

  9. ELECTRICAL • Electrical Resistivity of Copper: Adapted from Fig. 18.8, Callister 6e. (Fig. 18.8 adapted from: J.O. Linde, Ann Physik5, 219 (1932); and C.A. Wert and R.M. Thomson, Physics of Solids, 2nd edition, McGraw-Hill Company, New York, 1970.) • Adding “impurity” atoms to Cu increases resistivity. • Deforming Cu increases resistivity. 4

  10. THERMAL • Space Shuttle Tiles: --Silica fiber insulation offers low heat conduction. • Thermal Conductivity of Copper: --It decreases when you add zinc! Fig. 19.0, Callister 6e. (Courtesy of Lockheed Missiles and Space Company, Inc.) Adapted from Fig. 19.4W, Callister 6e. (Courtesy of Lockheed Aerospace Ceramics Systems, Sunnyvale, CA) (Note: "W" denotes fig. is on CD-ROM.) Adapted from Fig. 19.4, Callister 6e. (Fig. 19.4 is adapted from Metals Handbook: Properties and Selection: Nonferrous alloys and Pure Metals, Vol. 2, 9th ed., H. Baker, (Managing Editor), American Society for Metals, 1979, p. 315.) 5

  11. MAGNETIC • Magnetic Storage: --Recording medium is magnetized by recording head. • Magnetic Permeability vs. Composition: --Adding 3 atomic % Si makes Fe a better recording medium! 6

  12. OPTICAL • Transmittance: --Aluminum oxide may be transparent, translucent, or opaque depending on the material structure. polycrystal: low porosity polycrystal: high porosity single crystal 7

  13. DETERIORATIVE • Stress & Saltwater... --causes cracks! • Heat treatment: slows crack speed in salt water! 4mm --material: 7150-T651 Al "alloy" (Zn,Cu,Mg,Zr) 8

  14. SUMMARY Course Goals: • Use the right material for the job. • Understand the relation between properties, structure, and processing. • Recognize new design opportunities offered by materials selection. 9

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