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MTL 200 QUESTIONS AND ANSWERS
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MTL 200 QUESTIONS AND ANSWERS
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Name: Score:155 Multiple choice questions
Term 1 of 155
What is screw dislocation? What kind of grain boundary does it have?
- a shear stress that causes the slip of planes
- the dislocation line and burgers vector are parallel
- twist boundaries/distortion
- linear defect that centers on the line that is defined along the end of the extra half-
plane of atoms
- the dislocation line and burgers vector are perpendicular
- tilt boundaries
as packing density increases, surface energy decreases
δ<->Υ+⋲ (to the right is cooling, to the left is heating)
Term 2 of 155
What is a partially stabilized zirconia (PSZ)?
atoms of one metal diffuse into another
eutectic, eutectoid and peritectic reactions, melting of an alloy
a transformation WITH a change in the composition
a zirconia material contatining 3-7% CaO or other stabilizing agents including Y2O3 and
MgO
,Term 3 of 155
What coordinate form do you use for crystallographic directions for cubic structures,
hexagonal structures and for a family of equivalent directions?
Cubic structures: [UVW]
Hexagonal structures: [uvtw]
Family of equivalent directions: <uvw> <uvtw>
indicating the relative reactivities of a number of metals and commercial alloys in
seawater
a = unit cell edge length
R = atomic radius
a = 2Rsqrt(2)
the more IRREGULAR and RANDOM the repeat unit arrangements, the GREATER the
tendency for the development of non crystallinity
Term 4 of 155
What are 1 example of elements with a Simple Cubic structure?
Thallium
Selenium
Tellurium
Polonium
Term 5 of 155
Do silicates have a strong or weak bond? What kind of bond is it?
hydrogen bond
ionic bond
strong covalent bond
weak ionic bond
,Term 6 of 155
What are the 3 regions in the polarization curve and what order are they from bottom to top?
- active
- passive
- transpassive
- cis-structure
- trans-structure
as packing density increases, surface energy decreases
- <1 : porous and unprotective
- 1~2: protective
- >2~3: cracking and flaking off
Term 7 of 155
What is isotropic?
a transformation WITH a change in the composition
the loss of chemical reactivity
material properties are INDEPENDENT of specimen orientation
several crystals having different crystal orientations
Term 8 of 155
What is a thermosetting polymer?
a relatively harder/stronger polymeric that, once cured, will not soften or melt. Not
reversible
a PURE metal electrode immersed in 1M solution of its OWN IONS at 25 DEGREES
all single bonds, and no new atoms may be added without removing other already
bonded atoms
a relatively soft polymeric material that softens when heated and hardens when cooled.
Reversible process
, Term 9 of 155
What is the working range?
to reduce the melting point and viscosity
sp3
the phase formed before a certain temperature
between working point and softening point
Term 10 of 155
What is cathodic protection?
dC/dx, the slope of the concentration profile at a given point
involved supplying electrons to the metal to be protected, making it a cathode
a PURE metal electrode immersed in 1M solution of its OWN IONS at 25 DEGREES
the MAXIMUM concentration of solute that may be added without forming a new phase
Term 11 of 155
What are the 2 things that molecular weight is dependent on?
- atomic size factor
- crystal structure
- electronegativity
- valence
- isotactic configuration (R is the on the same side)
- syndiotactic configuration (R alternates sides)
- atactic configuration (R is randomly positioned)
- active
- passive
- transpassive
- viscosity
- osmotic pressure
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