Materials Science Lecture 1 What is Materials Science

Materials Science Lecture 1

• What is Materials Science ? • Why do we study it ?

Example 1: Protective tiles on the space shuttle. • What conditions / environments might those tiles see? • What is the major concern in the design of those tiles?

Example 2: A concrete bridge • What is the role of the bridge? Fern Bridge, California http: //sunnyfortuna. com/explore/sights. htm

• I-35 bridge failure • Multiple deficiencies at inspections www. greentechforum. net

Tacoma Narrows

Materials History: Prehistoric The earliest materials? Two cave people…

Materials History: Ancient History • Extraction of Metals • Processing Natural materials • What’s next?

Materials Science and Engieering We study materials to learn why they behave the way they do so that we may use that knowledge to make good engineering decisions in choosing the right materials for the job and so that we may, if necessary, seek out methods of creating materials that will serve our needs best. ”

• Transmittance: OPTICAL --Aluminum oxide may be transparent, translucent, or opaque depending on the material structure. single crystal polycrystal: low porosity polycrystal: high porosity Adapted from Fig. 1. 2, Callister 7 e. (Specimen preparation, P. A. Lessing; photo by S. Tanner. )

Example 3: Follow the Bouncing Ball

Structure, Processing, & Properties • Properties depend on structure ex: hardness vs structure of steel (d) Hardness (BHN) 600 500 400 (c) (a) (b) 4 mm 300 200 30 mm 100 0. 01 0. 1 30 mm Data obtained from Figs. 10. 30(a) and 10. 32 with 4 wt% C composition, and from Fig. 11. 14 and associated discussion, Callister 7 e. Micrographs adapted from (a) Fig. 10. 19; (b) Fig. 9. 30; (c) Fig. 10. 33; and (d) Fig. 10. 21, Callister 7 e. 1 10 1000 Cooling Rate (ºC/s) • Processing can change structure ex: structure vs cooling rate of steel

Example 4: Polarized Light www. exploratorium. edu

Four Components to the Discipline of MSE

Classifactions of Materials o Metals - o Ceramics – o Polymers - o Composites - o Semiconductors - o Biomaterials - We will be primarily concerned with Metals, Polymers, and composites

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Course Goals: SUMMARY • Use the right material for the job. • Understand the relation between properties, structure, and processing. • Recognize new design opportunities offered by materials selection. • Understand that new materials can be tailored to specific design requirements.