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38 Cards in this Set
- Front
- Back
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The difference between atomic weight and atomic mass is:
a. atomic mass is the weighted average of the atomic weights of an atom's naturally occurring isotopes b. atomic weight is the weighted average of the atomic masses of an atoms's naturally occurring isotopes c. atomic mass and atomic weight are synonymous d. none of the above |
b. atomic weight is the weighted average of the atomic masses of an atom's naturally occurring isotopes
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The atomic number is?
a. The number of electrons in an atom b. The number of protons in an atom c. The number of neutrons in an atom d. None of the above |
b. The number of protons in an atom
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The electrons can be arranged using quantum theory. List the electronic configuration of Oxygen.
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1(s^2) 2(s^2) 2(p^4)
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True or False: The potential energy well describes the energy between two ions or atoms as a function of distance. The equilibrium distance (r*) is where there the force on the ions or atoms is zero.
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True
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What are the three primary types of bonding? List in order from the deepest potential energy wells to those with the shallowest energy wells.
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Ionic, Covalent, Metallic
(stronger the bond, deeper the well) |
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In crystalline materials, atoms have both short and long range order. What word describes structures that only have short-range order?
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amorphous
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In crystalline materials, the order can be interrupted by defects. Which of the following are point defects?
a. Vacancy b. Interstitial c. Substitutional d. Dislocation e. Grain Boundary f. All of the Above g. None of the Above |
a. Vacancy
b. Interstitial c. Substitutional |
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Determine the PDI for a polypropylene material with the number-average molecular weight of 32880 g/mol, the weight-average molecular weight of 35920 g/mol
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PDI = Mw/Mn = 35920/32880 = 1.092
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Which of the following had the highest ionic character? CO/NO
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CO
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What is an isomer?
a. A single atom b. A basic building block for large chemical chains c. Different arrangements of the same atoms d. A substance containing a hydroxyl ion |
c. Different arrangements of the same atoms.
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For a solution, which of the following is present in the higher concentration: Solute or Solvent?
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Solvent
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If you load a tensile specimen past its yield stress and then remove the force, the remaining strain is due to what type of deformation: Elastic or Plastic?
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Plastic
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Dislocations exist in ceramics and metals and are a type of line defect.
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True
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Name the type of dislocation that has an extra half plane of atoms on the top or bottom of the slip plane: Edge dislocation or Screw dislocation
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Edge dislocation
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The process by which plastic deformation is produced by dislocation motion is called Slip/Creep/Glide/Twisting
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Slip
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The progress of a phase transformation may be broken down into what two distinct stages?
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Nucleation and Growth
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Dislocations move within distinct slip systems. A slip system is a combination of the (Highest/Lowest) density planes and the (Highest/Lowest) density directions within a crystal system.
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Highest/Highest
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Are proeutectoid cementite and cementite the same phase?
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Yes
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As temperature increases, what happens to the fraction atoms capable of diffusive motion: increases or decreases?
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Increases
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Diffusion by which mechanism occurs more rapidly in metal alloys: vacancy or interstitial?
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Interstitial diffusion
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What is tempered martensite, a phase or a microstructure?
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Microstructure
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As dislocation density increases, the resistance to dislocation movement increases or decreases?
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Increases
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Name three of the four distinct MICROSTRUCTURES that contain the phases ferrite and cementite in low carbon iron alloys.
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Pearlite, Bainite, Tempered Martensite
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As a phase change occurs, the transformation has two steps. The first is a nucleation step and the second is a growth step. For nucleation to proceed there needs to be a decrease in system energy. What two types of energy (related to the particle nucleating) are there?
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Surface Free energy and Volumetric Free energy
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Beyond the UTS of a metal, which one is higher: Engineering stress or True stress?
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True stress
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True or False: Materials always fracture above their ultimate tensile strength
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False
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Name three other methods to STRENGTHEN polycrystalline materials.
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a. Decrease grain size
b. Coldworking c. Precipitate strengthening d. Solid solution strengthening |
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A transgranular fracture would run (along/across/nowhere near) grain boundaries
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Across
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Name the type of loading applied during Mode I: Shearing, Tearing, Normal
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Normal
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Name the type of loading applied during Mode II: Shearing, Tearing, Normal
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Tearing
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Will FCC or BCC metals be more susceptible to having ductile to brittle transition temperature?
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BCC
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As a successful expert in the field of materials fracture, you are hired as a witness for a trial. The prosecutors believe that a component failed with warning. You disagree because you see (dimples, voids, intergranular cracking) along the fracture path.
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Intergranular cracking
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How does grain size influence the yield strength of a material? As the grain size increases, the yield strength (increases/decreases)
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Decreases
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True or False: Most metals strain harden at room temperature
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True
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Name two properties that increase after Coldworking:
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Yield strength, Ultimate tensile strength
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Name one property that decreases after Coldworking:
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elongation to failure
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Name one property that stays the same after Coldworking:
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elastic modulus
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Write the names of the three stages of annealing:
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1. recovery
2. recrystallization 3. grain growth |
