ME 250 Exam 1

Involves loss of metal atoms at an anode

Where consumption of the resulting electrons occurs

Zinc coating protects against corrosion

protects against corrosion

have low ductility and toughness

load per unit area

the maximum in the stress-strain curve thus it is the load-vearing capacity of a specimen in tension.

A region in the specimen begins to thin down more than any other region

size-dependent measures of load and displacement, respectively

this reversible behavior often shows a linear relation between stress and strain.

the permanent deformation behavior occurs when the tensile (or compressive) uniaxial stress reaches sigma_y

the arrangement of phases and grains

specified in terms of indexing schemes

Mechanism of plastic deformation. Motion of planes of atoms in specific planes and directions

Linear defects in a material; 3 kinds: edge, screw, mixed. Slip occus by the motion of (this).

Governed by the ease/difficulty of motion of dislocations. Dislocations interact with different objects (other dislocations, solute atoms, grain boundaries, etc) and affect the overall plasticity.

Multiplication of dislocations for increased interactions and impediment to dislocation motion. Leads to increased yield strength, increased tensile strength, decreased ductility.

increases as a material is plastically deformed

Gamma

the value at which a material starts to deform plastically.

voids due to increased stress in all directions

A measure of the ability of a material to be defomed plastically without breaking. Inversely related to strength.

Ranks the reactivity of metals/alloys in seawater

the rapid formation of a thin oxide layer by the chemical combination of oxygen atoms with surface atoms of the metal

The basic unit of a crystal structure. Structures in three dimensions.

In a unit cell, the number of closest neighbors to the central atom.