Term
| Resolved shear stress along any slip direction present in a slip plane that is perpendicular to the direction of tensile loading will be zero |
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Definition
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Term
| critical resolved shear stress (CRSS) is the resolved shear stress at which slip commences in a slip system |
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Definition
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Term
| Plastic deformation by slip will occur in planes possessing maximum planar density along directions possessing maximum linear density in that plane |
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Definition
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Term
| Slip and twinning are the only two modes of plastic deformation |
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Definition
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Term
| Grain growth that occurs during annealing can reduce the strength of cold worked materials |
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Definition
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Term
| slip is a motion of dislocation during plastic deformation |
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Definition
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Term
| During recrystallization, strain free grains nucleate at the grain boudaries of the deformed material and grow at the expense of deformed matrix |
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Definition
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Term
| Cold work is the most common method used to improve the strength of single component metals |
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Definition
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Term
| For slip, the crystallographic orientation above & below the slip planes are the same |
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Definition
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Term
| Mechanical twinning occurs when the slip process is restricted |
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Definition
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Term
| Polycrystallie metals are stronger than single crystal equivalent is due to the stress needed to initiate slip is higher for polycrystalline than single crystal metals |
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Definition
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Term
| Mechanical properties are not affected during the recovery stage of the annealing process |
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Definition
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Term
| Ultimate tensile strength decreases during the recrystallization stage of the annealing process |
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Definition
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Term
| Steady state diffusion is a time-dependent process |
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Definition
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Term
| Flux equation is best described by the Fick's second law |
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Definition
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Term
| In solid-state, diffusion requires existence of vacancy |
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Definition
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Term
| FIck's First Law, J= -D(dC/dx) C C represents concentration at a given location and is independent of time |
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Definition
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Term
| Diffusion in the liquid state is best described by the Brownian dynamics |
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Definition
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Term
Interstitial diffusion does not involve vacancy
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Definition
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Term
| Precipitation hardening is caused by creating obstacles for dislocation motion |
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Definition
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Term
| Only alloy systems that exhibit increased solubility with decreased temperature are suitable candidates for preciptation hardening |
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Definition
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Term
| During "over-aging", precipitation hardenable alloy continue to increase its strengh with aging time |
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Definition
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Term
| Precipitation aging is a diffusion-control event |
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Definition
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Term
| In a stable ionic crystal configuration, a cation present is in contact with its nearest neighbor anions |
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Definition
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Term
| Cations are usually larger than anions |
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Definition
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Term
| Graphite has a layered structure and the layers are held together by covalent bonds |
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Definition
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Term
| Flexural strength of a ceramic is determined by bend testing |
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Definition
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Term
| In general, a crystalline ceramic is comprised of a lattice of anions with cations occupying interstitial sites in which they are stable |
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Definition
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Term
| Glassy ceramics have three-dimensional network structures |
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Definition
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Term
| Value of the most probable fracture strength decreases with increases in specimen size |
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Definition
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Term
Strengthening by precipitation results from:
a) coherency strains
b) Orowan looping
c) dislocation cutting through hard particles
d) All of the above |
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Definition
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Term
Ceramic clays:
a) Have layer structure
b) are hydrous alumino-silicates
c) can be pasticized by adding water
d) all of the above |
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Definition
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Term
When the aging temperature of a solution treated age-hardenable alloy is increased:
a) Rate of hardening will increase
b) Peak hardness achieved will be less
c) Peak hardening will occur sooner
d) All of the above |
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Definition
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Term
Number of nearest neighbors of a cation occupying an octahedral site present in an anion lattice is:
a) 6
b) 8
c) 1
d) 4
e) None of the above |
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Definition
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Term
| During recrystallization, strain-free grains nucleate at the grain boundaries of the deformed material and grow at the expense of deformed matrix. |
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Definition
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Term
| Ductility of metals is not affected by the extent of cold work. |
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Definition
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Term
| Mechanical properties are not affected during the recovery stage of the annealing process. |
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Definition
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Term
| Secondary creep rate is lower for single crystal than poly-crystal of the same metal |
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Definition
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Term
| In the solid solution strengthening approach, it works only if the atomic size of the substitution impurity is larger than the atomic size of the host metal |
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Definition
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Term
| In the solid solution strengthening approach, it works only if the atomic size of the substitution impurity is smaller than the atomic size of the host metal. |
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Definition
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Term
| As an empirical relationship, the yield strength increases linearly with the concentration of impurity. |
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Definition
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Term
| As an empirical relationship, the yield strength decreases linearly with the spacing of precipitates. |
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Definition
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Term
| In an equilibrium crystallization process, energy needed to generate the crystal is neglected. |
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Definition
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Term
| Austenite to Pearlite transformation is a diffusion-controlled process. |
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Definition
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Term
Pearlite is a single phase constituent
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Definition
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Term
| With the same heat treatment, strength of pearlite in steel depends on the total carbon content of steel. |
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Definition
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Term
| Martensites are unstable and can transform to inter-lamellar pearlites by heating at 700 C. |
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Definition
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Term
Austenite to Martensite transformation is a diffusionless process. |
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Definition
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Term
| Martensite is a single phase constituent. |
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Definition
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Term
| Mass fraction of Austenite transformed to Martensite depends of quenching temperature and time. |
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Definition
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Term
| Mass fraction of Austenite transformed to peralite depends on quenching temperature and time. |
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Definition
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Term
| Harder steel has a higher hardenability. |
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Definition
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Term
| The overall composition of the Pearlite microconstituent is the eutectoid compostion of Fe-C. |
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Definition
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Term
| Temperature at the onset of Austenite to Martensite transformation depends on the carbon content of Austenite. |
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Definition
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Term
| Pearlite and Bainite have the same two phases. |
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Definition
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Term
| Ductility of cast irons depends on the mass fraction of Fe3C. |
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Definition
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Term
| The hardenability of steels depends strongly on the carbon content. |
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Definition
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Term
| Tempering a quenched plain carbon steel at a temperature near 700C will produce spheroidite microstructure. |
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Definition
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Term
| Temper Martensite is a single phase microconstituent. |
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Definition
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Term
| Strength of martensite in steel depends on its carbon content. |
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Definition
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Term
| Cast iron has a lower melting temperature than steel. |
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Definition
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Term
| Common microconstituents in plain carbon steels are Bainite, Martensite, Pearlite, Spheroidite and Temper Martensite. Rank the strength of these microconstituents from lowest to highest |
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Definition
| Spheroidite, pearlite, bainite, temper martensite, martensite |
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Term
Modifier oxide added to a silicate glass will:
a) Donate the oxygen ion to take part in the network
b) Increase the O:Si ratio
c) Reduce the number of shared corners in SiO4 tetrahedral
d) All of the above
e) None of the above |
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Definition
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Term
Crystalline silica:
a) Exhibits polymorphism
b) Has the same crystal structure from room temperature to its melting point
c) Exhibits a range of temperatures over which both solid & liquid can co-exist
d) Will become a very fluid liquid, with very low viscosity, when it melts
e) None of the above |
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Definition
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Term
In crystalline silica, each Si4+ ion is bonded to:
a) Two O2- ions
b) Three O2- ions
c) Four O2- ions
d) One O2- ion
e) None of the above |
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Definition
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