 Summary Materials Science and Engineering

ISBN-10 1118319222 ISBN-13 9781118319222
427 Flashcards & Notes
8 Students

Remember faster, study better. Scientifically proven. • 1.5 Advanced Materials

• wat zijn deze materials
dat zijn poepjes
• 3 Fundamentals of Crystallography

• 1. Describe the difference in atomic/molecular structure between crystalline and noncrystalline materials.
2. Given three direction index integers, sketch the direction corresponding to these indices within a unit cell.
3. Specify the Miller indices for a plane that has been drawn within a unit cell.
4. Distinguish between single crystals and polycrystalline materials.
5. Define isotrophy and anisotrophy with respect to material properties.
• structural unit, unit cell, shape, tetrahedra, crystalline, crystal systems, points, directions, planes, coördinates, amorphous, anisotrophy, isotropic,
• 3.1 Introduction

• What is discussed in chapter 3?
In chapter 3 is the structure of materials discussed. There will be a focus on crystalline structures.
• 3.2 Fundamental Concepts

• What is a crystalline material?
A crystalline material is a material in which the atoms are arranged in a periodic manner over large atomic distances.
• What is a crystal structure?
A crystal structure is the way in which particles are spatially arranged.
• What is the atomic hard-sphere model?
In the atomic hard-sphere model, atoms are represented as solid spheres. In this model nearest-neighbor atoms touch each other.
• What does the term lattice mean in context of crystal structures?
Here lattice means a three-dimensional array of points coinciding with atom position.
• 3.3 Unit Cells

• Why is it convenient to use unit cells?
Since atoms occur in a repetitive array in crystal structures, it is possible to subdivide the structure, resulting in a parallelepiped.
• 3.4 Crystal Systems

• What are the seven crystal systems?
1. Cubic
2. Hexagonal
3. Tetragonal
4. Rhomboheral (trigonal)
5. Orthorhombic
6. Monoclinic
7. Triclinic
• What are the axial relationships and interaxial angles of the Cubic crystal system?
Axial relationship: a = b = c
Interaxial angles: α = β = γ = 90°
• What are the axial relationships and interaxial angles of the Hexagonal crystal system?
Axial relationship: a = b ≠ c
Interaxial angles: α = β = 90° ,γ = 120°
• What are the axial relationships and interaxial angles of the Tetragonal crystal system?
Axial relationship: a = b ≠ c
Interaxial angles: α = β = γ = 90°
• What are the axial relationships and interaxial angles of the Rhombohedral (Trigonal) crystal system?
Axial relationship: a = b = c
Interaxial angles: α = β = γ ≠ 90°
• What are the axial relationships and interaxial angles of the Orthohombic crystal system?
Axial relationship: a ≠ b ≠ c
Interaxial angles: α = β = γ = 90°
• What are the axial relationships and interaxial angles of the Monoclinic crystal system?
Axial relationship: a ≠ b ≠ c
Interaxial angles: α = γ = 90° ≠ β
• What are the axial relationships and interaxial angles of the Triclinic crystal system?
Axial relationship: a ≠ b ≠ c
Interaxial angles: α ≠ β ≠ γ ≠ 90°
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