what is not a mechanical property?

thermal conductivity

an amorphous crystal structure has short-range order only.

true

metals are made up of mostly what?

metallic elements

the same material that is processed differently will have the same properties

false

metals are usually what

crystalline

are metals usually single or multi grain?

multi grain

glasses are usually

amorphous

are glasses mutli grain, single grain, or neither?

they are neither

ceramics are usually what

crystalline or a mix of amorphous and crystalline regions

are cermaics single or multi grain?

multi grain

thermoplastics are usually what?

amorphous or a mix of amorphous and crystalline regions

thermosets are usually what?

amorphous

polymers are made up of mostly what?

nonmetallic elements

ceramics are mostly made up of what?

a mix of metallic and nonmetallic elements

Semiconductors are usually what?

crystalline

are semiconductors multi grain or single grain?

single grain

what material type has the highest density?

metals

which material type is least prone to corrosion?

ceramics

Which material type typically has both high strength and ductility?

metals

which material type is the most limited in the temperature that it can operate(high temp)?

polymers

which material type usually has the lowest density?

polymers

which material type has the highest stiffness?

cermamics

which material type has the lowest stiffness?

polymers

which material has the highest thermal conductivity?

metals

which material has the highest electrical conductivity?

metals

which material type can be operated at the highest temperature?

ceramics

which form of SiO2 is transparent?

amorphous SiO2

which form of carbon is the hardest?

diamond

which polymer type is easiest to recycle?

thermoplastics

which polymer is the most brittle?

thermosets

which type of polymer can deform the most without breaking?

elastomers

what is the most common semiconductor?

silicon

the equilibrium spacing between atoms in a solid is the same at all temperatures.

false

it takes a force to move atoms in solids away from their equilibrium.

true

are primary bonds stronger or weaker than secondary bonds?

stronger

the primary bonding type that involves the transfer of electrons from positive to negative ions?

ionic bonding

the primary bonding type that involves sharing of electrons that are not free to move is what?

covalent bonding

the type of bonding that occurs where valence electrons flow freely is what?

metallic bonding

the type of bonding that occurs mostly in metals is what?

metallic bonding

the type of bonding that occurs mostly in ceramics is what?

covalent (ionic or mix of the two)

the type of bonding that occurs mostly in semiconductors is what?

covalent bonding

the type of bonding that occurs mostly in thermoplastics is what?

covalent and secondary bonding

the strength of an elastomer can be increased by?

increasing the number of covalent bonds

are covalent bonds directional?

no

If the bonding energy for MgO is 1000 and the bonding energy for tungsten is 849, what would have the higher melting point?

MgO

If the bonding energy for MgO is 1000 and the bonding energy for tungsten is 849, what would have the higher stiffness?

MgO

the same compound can form a crystalline or an amorphous structure.

true

atoms in solids are not at their equilibrium position near defects?

true

the number of vacancies in a solid decreases as temperature increase.

false

a interstitial solid solution is more likely to occur when the minor element atom is small relative to the major element>

true

a substitutional solid solution is more likely to occur when the minor element (solute) is small relative to the major element (solvent).

false

defects affect the properties of materials.

true

Permanent deformation to a material when loaded is called what?

plastic deformation

if plastic deformation is difficult, ductility is lower.

true

the metal crystal structure with the highest ductility is.

FCC- face centered cubic

the metal crystal structure with the lowest ductility is.

HCP - hexagonal close pack

Dislocation slip is easiest in which metallic crystal structure?

FCC - face centered cubic

is dislocation slip easier in ceramics?

no

which is stronger pure copper or copper with 10weight% zinc?

copper with 10 weight% zinc

which is stronger copper that has not been plastically deformed or plastically deformed copper?

plastically deformed copper

which is stronger pure copper with a small grain size or a large grain size?

pure copper with the small grain size

which is stronger than a single-phase aluminum alloy or an aluminum alloy with precipitates.

the single phase aluminum alloy

the number of vacancies increases with increasing temperature.

true

dislocation slip occurs along random direction in a crystal.

false

plastic deformation occurs by bonds breaking and reforming?

true

will a thermoplastic rope that has been formed with plastic deformation be stronger if it has been deformed?

with plastic deformation