MSE 503 Test 3

Bakelite and epoxy are ___ thermosets.

heavily cross-linked

Hypereutectoid steels contain ___ 0.76 wt% carbon.

less than

The crystal structure of Fe3c is ___.

orthorhombic

A hypoeutectic composition is an alloy composition to the ___ of the ___ composition on the phase diagram, containing ___ of component B compared to the eutectic concentration.

left; eutectic; less

A thermoset prepolymer is ___ into a shape and then ___ to form the end-customer product.

pressed; reacted

Age hardening is a method of ___ strengthening.

dispersion

In a eutectic reaction, a liquid cools to a ___ solid of eutectic ___.

single-phase; two-phase; alpha + beta

In steel the solvent is ___ and the solute is ___.

iron; carbon

The phase alpha-iron is also called ___.

Ferrite

The simplest binary alloy system is ___.

isomorphous

What are the two classes of polymer, based on their responses to heating and cooling? ___ and ___.

thermoplastics; thermosets

In a Pb-Sn eutectic phase diagram, the region labelled Beta is a single-phase ___ region of solid beta-phase that extends to the ___.

Sn-rich; beta solubility limit line

An isomorphic phase-diagram is one that demonstrates ___ across ___.

complete solubility; the entire range of compositions

Thermoplastic polymers are ___ and ___ in structure.

linear; 1-D

The phase gamma-iron is also called ___.

austenite

During the transformation of austenite to pearlite, the carbon diffuses in a direction that is ___ to the face of the growing alpha region, to reach the neighboring Fe3C platelet

parallel

Crosslink agents for elastomers include ___ and ___

sulfur; oxygen

The main polymerization methods are ___ and ___.

condensation; addition

A boataEs polymer sails are typically made of

oriented-fiber polyethylene

In a phase diagram, the Y-axis present the ___ and the X-axis presents the ___.

temperature; composition

If the transformation-hold temperature (for austenite-containing steel) is way below the eutectoid temperature, we obtain ___ pearlite colonies that are ___ in size.

higher numbers of; smaller

When we add side groups to a polymer backbone, we increase ___ in the polymer

steric hindrance

In a binary isomorphous alloy, the elements combine to form ___ liquid ___ and ___ solid ___.

a single; phase; a single; phase

Plain-carbon steels are carbon-iron alloys with carbon between ___ and ___ wt%.

0.002; 2.14

In a Pb-Sn eutectic phase diagram, the region labelled alpha is a single-phase ___ region consisting of solid alpha-phase that extends to the ___.

Pb-rich; alpha solubility limit line

Pearlite is a ___ and not a ___.

microstructure; phase

Condensation polyamide polymers are used for polymer ___.

parachutes

The most important phase reactions in a phase diagram are the ___ and ___ reactions.

eutectic; eutectoid

Polymers can be produced by two types of organic reactions, ___ and ____.

condensation; addition

When a ___ polymer is heated, it softens and will flow when a ___ is applied. When it is cooled down, it becomes ___ or ___ again. This process can be repeated many times.

thermoplastic; stress; solid; rubbery

The phase for Fe3C is also called ___.

cementite

The Pearlite microstructure is composed of alternating ___ or ___ of alpha Ferrite and Fe3C cementite.

platelets; lamellae

Thermosetting polymers are ___ and ___ in structure.

nonlinear; 3-D

In a phase diagram, the Lever Rule is used to determine the ___ and the ___ of the phases that are present in a two-phase region.

relative amounts; compositions

As the carbon content of a steel increases, its hardness ___.

increases

An isomorphous alloy system manifests ___ of crystal structure for ___ component elements.

a single type; all ratios of the

Precipitate hardening occurs by formation of ___ dispersed ___.

finely; precipitates

The degree of polymerization of a polymer can also be called its ___.

chain length

Injection blow molding is commonly used to make plastic ___.

water bottles

In a phase diagram, the State Point is determined by a specific ___ at a specific

composition; temperature

Addition polymers with CF2-CF2 groups are used for ___.

Teflon coatings for cookware

A characteristic ___ microstructure forms during a eutectic reaction

lamellar

During the transformation of austenite to pearlite, the pearlite colony typically nucleates ___.

at a austenite grain-boundary

The microstructures and associated properties of steels depend on their ___.

composition

The plastic parts of mobile phones, wireless phones, plugs and rubber pens are often manufactured by ___.

injection molding

Poly-diene polymers are used for ___.

car tires

An example of a binary isomorphous alloy system is ___.

copper-nickel

A natural rubber can be converted into a ___ polymer by a curing process called

thermoset; vulcanization

Rubber is a ___.

cross-linked elastomer

Plastic tubing and pipes are made by a process of ___.

extrusion