Table of Contents
Behavior and Manufacturing Properties of Material
Schematic Representation of the Bohr Atom
Periodic Table of the Elements
Equilibrium condition: atom spacing fixed unless bonding energy overcome
Ionic Bonding Sodium Chloride Schematic
Covalent Bonding Methane Schematic
Metallic Bonding
Bonding Energies and Melting Temperatures for Various Substances
Crystal Structures:
Example: Calculate the volume of an FCC unit cell in terms of the atomic radius R.
Example: Show that the atomic packing factor for the FCC crystal structure is 0.74
Body centered cubic structure
Hexagonal close packed structure
Similarities in FCC and HCP
Atomic Radii and Crystal Structure for Common Metals
Computation of Density
Theoretical Strength of a Metal
Theoretical Strength of a Metal
Solidification of Polycrystalline Material
Microstructure of Common Materials
Anisotropy:
Point Defects (lattice irregularities) Impede dislocation motion
Point defects in a close-packed plane
Local stress implication of point defects
Dislocations (line defects) motion allows slip (plastic deformation wherein interatomic bonds are ruptured and reformed).
Edge Dislocations Allow Slip at a Much Lower Stress Than in a Perfect Crystal
Crystal with Edge Dislocation:
Dislocation motion is analogous to the movement of a caterpillar
Edge Dislocation in Two-Dimensional Close-Packed Lattice
Bubble raft illustrating several grain boundaries of varying misorientation q.
Screw Dislocation
Screw Dislocations (lattice irregularity)
Motion of Dislocations
Dislocation with edge, screw and mixed character
Slip is dominant mechanism for deformation
Slip Lines
Slip Planes
Slip systems for face-centered cubic, body-centered cubic, and hexagonal close-packed metals
Plastic Deformation of Polycrystalline Materials:
Strengthening
Strengthening by Grain Size Reduction
Solid Solution Hardening
Strain Hardening (Cold Working)
Strain Hardening (Cold Working):
Recovery, Recystallization and Grain Growth
Recrystallization temperatures for various metals
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