Materials Science

A cold worked material with a decreased area, maintains that decreased area during annealing"

The easiest slippage of atomic planes occurs in the direction of

Ductile fracture is undesireable because failure is unpredictable and often catastrophic

Which an example of a cold work process to strengthen metals?

Material strengthening reduces a materials tendency to undergo dislocation motion thereby increasing ductility

Interstitial atoms within a lattice of atoms tend to concentrate at the dislocation position with compressive stress

Increasing the number of grain boundaries decreases a materials resistance to dislocation motion

Substitutional atoms smaller than the overall lattice atoms tend to concentrate at the dislocation position with compressive stress:

The easiest slippage of atomic planes occurs between:

A material with a fatigue limit will eventually break even if the max stress is below the fatique limit stress

Impact testing shows that brittle materials absorb significant energy before fracture

Brittle fracture is undesireable because failure is unpredictable and often catastrophic

Recrystallization Temp (Tr) is typically < 0.3x melting temp (Tm)

With respect to the dislocation line, the extra plane of atoms perpendicular causes compressive stress"

Dislocation motion is a form of elastic deformation

Fatigue is a decrease in material strength due to cylic loading of the material over time

The local stress that causes crack propagation in a material increases with

"Solid solutions form lattice strains on adjacent material planes, thereby reducing dislocation motion

Substitutional atoms larger than the overall lattice atoms tend to concentrate at the dislocation position with compressive Stress

If the critical stress (Tcrss) is less than the resolved stress (Tr), then:"

Due to fatigue, a material can eventually fail even if the cycle stress is below the yield stress of a material"

"Water phases (liquid, gas, solid) can be depicted on a:"

Which steel transformation product has highest strength?

A single liquid phase that transforms into two solid phases is

Which steel transformation product has highest ductility?

At a temp just below 180 'C, the composition of β in C'4 is

A liquid and solid phase that transforms into one solid phase is:

"This steel has low carbon content, is inexpensive, and used mostly for support structures

The ionic structure with a coordination number of 6 is

Phase diagrams are a function of:

This steel is easily melted and molded, but too brittle to machine (i.e cold work)

An impurity in a ceramic causes a charge imbalance

Which method is used to pour molten metal into a mold and cool to a final shape?

Ceramics, due to their highly brittle nature, are tested for strength and modulus by:"

The Ionic structure with the highest stability and resistance to fracture is

A solution is a single phase compostion

A single solid phase that transforms into two solid phases is:

"This steel has highest wear resistance and is used for knives, razors, and tools that hold an edge

Nomenclature for a plain carbon steel with 0.85wt% carbon would be

Which alloy has the lowest density, which is useful in portable electronics and defense weapons?"

A mixture is a single phase compostion

Which is not a forming method for shaping alloys

Large cooling temperature (ΔT) past a phase boundary creates

Small cooling temperature (ΔT) past a phase boundary creates

The ionic structure where the anion and cation are of similar size and therefore arrange in a similar manner to most metals is

which alloy hash the highest resistance?

Pure eutectic steel has an overall conce of:

At a temp just below 180 'C, the weight fraction of eutectic steel in C'4 is calculated by

At a temp just below 180 'C, the composition of alpha in C'4 is:"

The following material is completely solid at a temperature below:

Isomorphous materials have:

"This steel has good wear resistance and is used for wood cutting tools, nuts, and bolts"

"The resolved shear stress (Tr), due to planar slip in a linear direction is maximum at which angle, with respect to the applied shear

Which is not an example of a cold work process to strengthen metals

Edge dislocation motion is parallel to the direction of shearing force

Which is not a step in addition polymerization

Thermoplastics are soft and ductile when used at a temperature (T):

Which is considered the most difficult material to recycle?

Which additive improves polymer strength

Which is not a property of thermoplastics?

Which is not a description of a type of copolymer structure

Which is not a form of corrosion

Thermoplastics are strong and brittle when used at a temperature (T):

Anealing a polymer increases crystallinity, which increases ductility and decreases tensile strength"

"With respect to the dispersed phase alignment, composites are:"

The weight-average (Mw) of a polymer tends to be higher than the same polymers number-average (Mn) (Mw>Mn)

Which is not a purpose of the dispersed phase of a composite

Thermoplastics can be reformed and recycled at a temperature

Crystalline polymers must have a significantly higher molecular weight than their non-crystalline counterparts

Which is a polymer unit that contains an alcohol group?

Cathodic metals (larger electomotive force) resist corrosion more than aniodic metals

What are the two reactions necessary to cause corrosion

Which is not a property of thermosets?

Corrosion is an electrochemical attack that degrades materials

Which is a polymer unit that contains an aldehyde group

Which is a polymer unit that contains an ether/ester group?

"A repeat unit is a compound, that when reacted, breaks chemical bonds forms the polymer backbone"

Name the tacticity: when a specific branch of a polymer repeat unit alternates sides of the polymer backbone

Name the tacticity: when a specific branch of a polymer repeat randomly alternates sides of the polymer backbone

Name the tacticity: when a specific branch of a polymer repeat unit is always on the same side of the polymer backbone

Structural composites are not strong in

The degree of polymerization (DP) is the Mw of a polymer divided by its monomer's total atomic weight

Polymers with large or complex side-groups or branches are less likely to form highly crystalline plastics

Which additive reduces polymer degradation

Which additive reduces polymer strength and improves ductility

Polyethylene is not typically found in the following product:

Which is a polymer unit that contains an acid group?

A monomer is the smallest unit of a polymer chain that repeats

Which is not a classification of composites:

The matrix phase of a composite protects and transfers stress to the dispersed phase