1. Engr 2110 Introduction to Material Science (for Engineers) Dr. Richard R. Lindeke, Ph.D. B Met. Eng. University of Minnesota, 1970 Master’s Studies, Met Eng. Colorado School of Mines, 1978-79 (Electro-Slag Welding of Heavy Section 2¼ Cr 1 Mo Steels) Ph.D., Ind. Eng. Penn State University, 1987 (Foundry Engineering – CG Alloy Development)

2. Syllabus and Website: Review the Syllabus Attendance is your job – come to class! Final is Common Time Monday or Tuesday Or our regularly scheduled time (Tuesday May 12 8-10 AM) Pop Quizzes and homework/Chapter Reviews (Ch 17/18) – (20% of your grade!) Don’t copy from others; don’t plagiarize – its just the right thing to do!! Course Website: http://www.d.umn.edu/~rlindek1/ENGR2110/Cover_ Page.htm

3. Materials Science and Engineering It all about the raw materials and how they are processed That is why we call it materials ENGINEERING Minor differences in Raw materials or processing parameters can mean major changes in the performance of the final material or product

4. Looking At CG Iron Alloy Development (Processing):

6. CG Structure – but with great care! Good Structure 45KSI YS; 55KSI UTS Poor “Too Little” Poor “Too Much”

7. Looking At CG Iron Alloy Development (Structures)

8. Looking At CG Iron Alloy Development (Results)

9. Our Text: Material Science and Engineering An Introduction by William D. Callister, Jr Seventh Edition, John Wiley & Sons, Inc.

10. Materials Science and Engineering Materials Science The discipline of investigating the relationships that exist between the structures and properties of materials. Materials Engineering The discipline of designing or engineering the structure of a material to produce a predetermined set of properties based on established structure-property correlation. Four Major Components of Material Science and Engineering: Structure of Materials Properties of Materials Processing of Materials Performance of Materials

11. And Remember: Materials “Drive” our Society! Ages of “Man” we survive based on the materials we control Stone Age – naturally occurring materials Special rocks, skins, wood Bronze Age Casting and forging Iron Age High Temperature furnaces Steel Age High Strength Alloys Non-Ferrous and Polymer Age Aluminum, Titanium and Nickel (superalloys) – aerospace Silicon – Information Plastics and Composites – food preservation, housing, aerospace and higher speeds Exotic Materials Age? Nano-Material and bio-Materials – they are coming and then …

12. And Formula One – the future of automotive is … http://www.autofieldguide.com/articles/050701.html

13. Doing Materials! Engineered Materials are a function of: Raw Materials Elemental Control Processing History Our Role in Engineering Materials then is to understand the application and specify the appropriate material to do the job as a function of: Strength: yield and ultimate Ductility, flexibility Weight/density Working Environment Cost: Lifecycle expenses, Environmental impact* * Economic and Environmental Factors often are the most important when making the final decision!

14. Example of Materials Engineering Work – Hip Implant With age or certain illnesses joints deteriorate. Particularly those with large loads (such as hip). Adapted from Fig. 22.25, Callister 7e.

15. Example – Hip Implant Requirements mechanical strength (many cycles) good lubricity biocompatibility Adapted from Fig. 22.24, Callister 7e.

16. Example – Hip Implant Adapted from Fig. 22.24, Callister 7e.

17. Solution – Hip Implant Key Problems to overcome: fixation agent to hold acetabular cup cup lubrication material femoral stem – fixing agent ( “ glue ” ) must avoid any debris in cup Must hold up in body chemistry Must be strong yet flexible Acetabular Cup and Liner Ball Femoral Stem

18. Introduction List the Major Types of MATERIALS That You Know: METALS CERAMICS POLYMERS COMPOSITES ADVANCED MATERIALS

19. Introduction, cont. Metals Steel, Cast Iron, Aluminum, Copper, Titanium, many others Ceramics Glass, Concrete, Brick, Alumina, Zirconia, SiN, SiC Polymers Plastics, Wood, Cotton (rayon, nylon), “glue” Composites Glass Fiber- reinforced polymers, Carbon Fiber- reinforced polymers, Metal Matrix Composites, etc.

20. Thoughts about these “ fundamental ” Materials Metals: Strong, ductile high thermal & electrical conductivity opaque, reflective. Polymers/plastics: Covalent bonding  sharing of e ’ s Soft, ductile, low strength, low density thermal & electrical insulators Optically translucent or transparent. Ceramics: ionic bonding (refractory) – compounds of metallic & non-metallic elements (oxides, carbides, nitrides, sulfides) Brittle, glassy, elastic non-conducting (insulators)

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

22. But: Properties depend on Structure (strength or hardness) Hardness (BHN) Cooling Rate (ºC/s) 100 200 3 4 5 6 0.010.11101001000 (d) 30  m (c) 4 m4 m (b) 30  m (a) 30  m And: Processing can change structure! (see above structure vs Cooling Rate)

23. Another Example: Rolling of Steel At h 1, L 1 low UTS low YS high ductility round grains At h 2, L 2 high UTS high YS low ductility elongated grains Structure determines Properties but Processing determines Structure!

24. Optical Properties of Ceramic are controlled by “Grain Structure” Grain Structure is a function of “Solidification” processing!

25. Electrical Properties (of Copper): Adapted from Fig. 18.8, Callister 7e. (Fig. 18.8 adapted from: J.O. Linde, Ann Physik 5, 219 (1932); and C.A. Wert and R.M. Thomson, Physics of Solids, 2nd edition, McGraw-Hill Company, New York, 1970.) T (°C) -200-1000 Cu + 3.32 at%Ni Cu + 2.16 at%Ni deformed Cu + 1.12 at%Ni 1 2 3 4 5 6 Resistivity,  (10 -8 Ohm-m) 0 Cu + 1.12 at%Ni “Pure” Cu Electrical Resistivity of Copper is affected by: Contaminate level Degree of deformation Operating temperature

26. THERMAL Properties Space Shuttle Tiles: --Silica fiber insulation offers low heat conduction. Thermal Conductivity of Copper: --It decreases when you add zinc! 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 7e. (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.) Composition (wt% Zinc) Thermal Conductivity (W/m-K) 400 300 200 100 0 010203040 100  m

27. MAGNETIC Properties Magnetic Permeability vs. Composition: --Adding 3 atomic % Si makes Fe a better recording medium! Adapted from C.R. Barrett, W.D. Nix, and A.S. Tetelman, The Principles of Engineering Materials, Fig. 1-7(a), p. 9, 1973.Electronically reproduced by permission of Pearson Education, Inc., Upper Saddle River, New Jersey. Fig. 20.23, Callister 7e. (Fig. 20.23 is from J.U. Lemke, MRS Bulletin, Vol. XV, No. 3, p. 31, 1990.) Magnetic Storage: --Recording medium is magnetized by recording head. Magnetic Field Magnetization Fe+3%Si Fe

28. DETERIORATIVE Properties Stress & Saltwater... --causes cracks! Adapted from chapter-opening photograph, Chapter 17, Callister 7e. (from Marine Corrosion, Causes, and Prevention, John Wiley and Sons, Inc., 1975.) 4 m4 m --material: 7150-T651 Al "alloy" (Zn,Cu,Mg,Zr) Adapted from Fig. 11.26, Callister 7e. (Fig. 11.26 provided courtesy of G.H. Narayanan and A.G. Miller, Boeing Commercial Airplane Company.) Heat treatment: slows crack speed in salt water! Adapted from Fig. 11.20(b), R.W. Hertzberg, "Deformation and Fracture Mechanics of Engineering Materials" (4th ed.), p. 505, John Wiley and Sons, 1996. (Original source: Markus O. Speidel, Brown Boveri Co.) “held at 160ºC for 1 hr before testing” increasing load crack speed (m/s) “as-is” 10 -10 10 -8 Alloy 7178 tested in saturated aqueous NaCl solution at 23ºC

29. Using the right material for the job. one that is most economical and “Greenest” when life usage is considered Understanding the relation between properties, structure, and processing. Recognizing new design opportunities offered by materials selection. Course Goal is to make you aware of the importance of Material Selection by: