Evidence of plastic deformation in structural materials. Also called plastic flow or creep. See also flow.

The condition of being electrically separated from other metallic structures or the environment.

(1) An iron mineral crystallizing in therhombohedral system; the most important oreof iron. (2) An iron oxide, Fe,O,, corrcsponding to an iron content of approximately 70%.

A chromate conversion coating produced on magnesium alloys in a boiling solution of sodium dichromate.

Provisional value for plane-strain fracture toughness.

The lowest value of oxidizing potential at which pits nucleate and grow. It is dependent on the test method used.

A change in dimensions directly proportional to and in phase with an increase or decrease in applied force.

A linear imperfection in a crystalline array of atoms. Two basic types are recognized: (1) an edge dislocation corresponds to the row of mismatched atoms along the edge formed by an extra, partial plane of atoms within the body of a crystal; (2) a screw d ...

Deforming metal plastically under conditions of temperature and strain rote that induce strain hardening. Usually, hut not necessarily, conducted at room temperature. Contrast with hot working.

The property of a material by virtue of which deformation caused by stress disappears upon removal of the stress. A perfectly elastic body completely recovers its original shape and dimensions after release of stress.

See principal stress (normal).

Plating with dummy cathodes.

The selective leaching or corrosion of a specific constituent (Al, Ni, Mo, Ni) from an alloy.

A strongly alkaline solution into which metal is immersed for etching. for neutralizing acid, or for removing organic materials such as greases or paints.

The partial derivative of the total electrochemical free energy of a constituent with respect to the number of moles of this constituent where all factors are kept constant. It is analogous to the chemical potential of a constituent except that it include ...

The interface between an eletrode or a suspended particle and an electrolyte created by charge-charge interaction (charge separation) leading to an alignment of oppositely charged ions at the surface of the electrode or particle. The simplest model is rep ...

Corrosion occurring under or around a discontinuous deposit on a metallic surface. Also called poultice corrosion.

In a cathodic protection system, in electrically nonconductive material, such as a coating, plastic sheet or pipe that is placed between an anode and an adjacent cathode to avoid current wastage and to improve current distribution, usually on the cathode.

Any interruption in the normal physical structure or configuration of a part, such as cracks, laps, seams, inclusions, or porosity. A discontinuity may or may not affect the usefulness of the part.

Imparting resistance to oxidation to an iron or steel surface by heating in aluminum powder at 800 to 1000