Processing
What fabrication process consists of pouring liquid metal into a mold, and removing the solidified product once cooled?
Casting
How many nearest neighbors does an atom in a simple cubic lattice have?
6
Silicon and germanium are examples of ___, which can act as either conductors or insulators depending on factors such as temperature or applied voltage.
Semiconductors
On an engineering stress-strain curve, what is the highest point called?
Ultimate tensile strength
A Schottky defect consists of ___?
Cation-anion vacancy pair
What process uses chemicals like HF or concentrated NaOH to selectively remove material from a substrate?
Etching
What is the atomic packing factor of an HCP crystal?
.74
What is the band gap of room temperature silicon? (1 sig fig needed)
1.12 eV
What property describes a material's ability to elongate before rupturing under stress?
Ductility
A slip system consists of ___ and ___.
Slip plane, slip direction
What is the most common additive manufacturing method for polymers?
Fused deposition modeling (FDM)
What is the close-packed direction of an FCC crystal?
<110>
An Ohmic contact results in a ___ relationship between current and voltage.
Linear
At room temperature, would a material with a glass transition temperature of 100C be glassy or rubbery?
Glassy
What type of material flows more easily when subjected to stress (exhibits time-dependent shear thinning)?
Hint: Ketchup is one example.
Thixotropic
What is the purpose of calcination in ceramics processing?
Remove volatile impurities and induce phase transformation into target material
What is the relationship between side length and atomic radius in a BCC crystal?
a*sqrt(3) = 4R
n-type doping shifts the Fermi level in which direction?
Upward, closer to the conduction band
What is the Poisson ratio of a perfectly compressible material?
0
What was the first element to be synthesized rather than discovered in nature?
Technetium
Name the four ways a metal can be hardened.
1: solution strengthening (alloying)
2: precipitation hardening
3: cold working (plastic deformation)
4: grain boundary strengthening (Hall-Petch strengthening)
In which crystal system are all angles 90 degrees and two of the three side lengths equal?
Tetragonal
What property describes a material that exhibits spontaneous electric polarization which can be reversed by an applied electric field?
Ferroelectric
What are the units of fatigue limit?
Stress units (Pa, MPa, psi, etc.)
Name the three primary allotropes of SiO2 at normal atmospheric pressure.
Quartz, tridymite, cristobalite