Materials Science

MSE 201 Final

30 cards·by land001014

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Electronegativity in the periodic table.

Increase toward the right and increase upward.

Very electronegative atoms are most likely to..

Acquire an extra electron.

The permanent transfer of an electron in a bond between two atoms describes..

ionic bonding.

The electronic configuration for a Mg ion with a +2 charge is..

1s^2 2s^2 2p^6

THe atomic packing factor for a face centered cubic metal is..

.74

Covalent bonding involves..

Atoms with similar electroneagtivity.

Bonding energy can approximately be used to predict..

Melting point.

The number of atoms/unit cell in the BCC unit cell is..

ABABAB stacking is a characteristic of..

Hexagonal close packed structures.

Hume-Rothery rules relate to..

Ability to form solid solutions in metal systems.

A dislocation is an example of a..

Line defect.

Self-interstitials in metals..

Are very rare, occur in open positions between regular lattice sites, and introduce excessive strain into the lattice.

The equilibrium concentration of vacancies in solids..

Varies exponentially with temperature.

edge dislocations are represented as..

An extra half plane of atoms.

The Burgers vector of a screw dislocation is..

Parallel to the dislocation line.

A slip system is a combination of..

A slip direction and slip plane.

One of the primary functions of a Charpy impact test is to determine..

Ductile-to-brittle transition temperatures.

Plastic deformation in metals is the result of..

Motion of dislocations.

Brittle fracture is characterized by..

Very rapid crack growth, little plastic deformation, and a relatively flat fracture surface.

Failure by creep occurs..

For metals at temperatures above half of their melting point in degrees Kelvin.

Tensile strength is

The peak of the curve on the graph.

The yield strength is..

the point where the graph stops being linear.

The ductility is..

The point where the graph ends.

The elastic modulus is..

The slope, or triangle formed by the linear portion of the graph.

Largest toughness value is..

The largest area under the curve of the graph.

The diffusion coefficient D for metals..

Increases exponentially with temperature.

Largest values of amplified stress arise from cracks that have the following characteristics:

Long length and small radius of curvature.

The rate of vacancy diffusion is..

slower than interstitial diffusion.

The yield strength of a metal is defined as the strength at...

.2% plastic strain.

Elastic deformation is..

Reversible, linear portion of the stress strain curve, and due to stretching of atomic bonds.