Quiz 1: Things to know


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Ch. 1. Introduction

  • Different properties of materials that determine their applicability.
  • Criteria important to select materials (e.g., cost).
  • Classification of materials (e.g., metals).
  • Properties that pertain to a particular class (e.g., metals are strong and opaque, ceramics are hard and brittle, etc.)
  • Ch. 2. Atomic Structure and Bonding

  • How orbitals are filled in atoms and which ones participate in bonding.
  • Plots of both potential energy and force between atoms: attractive and repulsive parts, minimum energy, sign of energy and force in different regions.
  • How to derive the force from the potential energy.
  • How the depth and shape of the potential well affect materials properties.
  • Differences between bond types (e.g., ionic, metallic).
  • Correlation that exists between a class of materials and bonding (e.g., ceramics and ionic bonds).
  • Ch. 3. Structure of Crystalline Solids

  • How to calculate the number of atoms in a volume of material.
  • Differences between crystalline and amorphous solids, and between single crystals and polycrystalline materials.
  • How to distinguish polymorphism and allotropy.
  • How atoms are arranged in FCC, BCC and HCP crystals and be able to draw the unit cell.
  • Different properties of FCC, BCC, and HCP crystals (e.g., coordination number, APF): their values and how they are calculated.
  • How to calculate the density knowing the crystal structure, lattice parameter, and atomic weight.
  • How to identify the crystal structure given the atomic weight, atomic radius, and density.
  • Difference in packing order between FCC and HCP structures.
  • How to identify close packing directions. 
  • Ch. 4.  Imperfections in Solids

  • How vacancies and interstitials are defined.
  • Which are point (0D), line (1D), surface (2D) and volume (3D) defects.
  • How properties of a material change near a grain boundary or a surface.
  • How to calculate number of vacancies at some temperature given the relevant formation energy.
  • What happens to the number of vacancies when the temperature is increased or decreased and why.
  • What are a solid solution, a solute and a solvent.
  • What properties of atoms determine the ability to dissolve each other (e.g., similar atomic radius).
  • How to calculate weight percent of atoms in a solution given the percent concentrations and atomic weights.
  • How to calculate percent concentration of atoms in a solution given the weight percent and atomic weights.
  • How the lattice deforms around a vacancy, an interstitial, and dislocations.
  • How the lattice differs from the bulk properties near a surface or a grain boundary.
  • Different type of dislocations and be able to draw them.
  • What is the Burgess vector and what angle it makes to the dislocation line in different cases.
  • Ch. 5. Diffusion

  • What drives diffusion.
  • Different mechanisms of diffusion.
  • How and why diffusion increases with temperature and decreases with activation (diffusion) energy..
  • Difference between steady state and non-steady state diffusion.
  • Factors that affect different mechanisms of diffusion .
  • How to calculate the diffusion flux given the concentration gradient and diffusion coefficient.
  • How to calculate the concentration gradient given the diffusion coefficient and diffusion flux
  • How to calculate the diffusion coefficient at one temperature from that at a different temperature or from the diffusion flux and concentration gradient.