Introduction to Materials Science and Engineering

Introduction to Materials Science and Engineering

• Course led by Prof. Alex Grumezescu and assistants.

• 50% of final grade from exam, 50% from lab.

Definition of Materials

• Material: Substance or mixture of substances from which objects/products are made.

• Types: Pure/impure, living/non-living matter.

Key Components of Materials Science and Engineering

• Composition: Chemical make-up of materials.

• Structure: Arrangement of atoms/ions.

• Synthesis: Making materials from raw inputs.

• Processing: Shaping and altering properties of materials.

• Performance/Cost: Evaluating effectiveness and economic factors.

Classification of Materials

By State of Matter

• Solid: Definite shape/volume, organized particle arrangement, specific melting point.

• Liquid, Gas: Variability in shape and volume.

By Structure

• Crystalline: Ordered atomic arrangement.

• Amorphous: Non-crystalline, unordered structure (e.g., glass).

By Field of Use

• Structural materials: Concrete, wood, steel.

• Architectural materials: Glass, ceramics, wood.

• Coating materials: Wood, metal sheets.

Mechanical Behavior of Materials

• Elastic materials: Return to original shape after stress.

• Plastic materials: Permanent deformation after stress.

Defects in Materials

Types of Defects

• 0D Point Defects: Vacancies, interstitial atoms.

• 1D Linear Defects: Edge and screw dislocations.

• 2D Interfacial Defects: Grain boundaries, twin boundaries, phase boundaries.

• 3D Bulk Defects: Pores, cracks formed during processing.

Questions to Consider

1. What is crystalline structure?

2. What is amorphous structure?

3. Define vitreous structure.

4. What are structural materials? (Examples)

5. What are coating materials? (Examples)

6. What defines elastic material?

7. What defines plastic material?

8. How are crystalline lattice defects classified?

9. What are phase boundaries?

10. Define polycrystalline material.