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 ...

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.

(1) Permanently damaging a metal or alloy by heating to cause either incipient melting or intergranular oxidation. See also over-heating. (2) In grinding, getting the work hot enough to cause discoloration or to change the microstructure by tempering or h ...

The condition of an electrode when the rate of anodic dissolution just balances the rate of cathodic plating.885

The coating, usually green, that forms on the surface of metals such as copper and copper alloys exposed to the atmosphere. Also used to describe the appearance of a weathered surface of any metal.

A surface treatment at elevated temperature, generally carried out in pack, vapor, or salt bath, in which an alloy is formed by the inward diffusion of chromium into the base metal.

The potential of a corroding surface in an electrolyte, relative to a reference electrode. Also called rest potential, open circuit potential, or freely corroding potential.

Material placed in a drilled hole to fill space around anodes, vent pipe, and buried components of a cathodic protection system.

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

A fractographic pattern of radial marks (shear ledges) that look like nested letters "V"; sometimes called a herringbone pattern. Chevron patterns are typically found on brittle fracture surfaces in parts whose widths are considerably greater than their t ...

The maximum stress that a material is capable of sustaining without any permanent strain (deformation) remaining upon complete release of the stress.

A metastable aggregate of ferrite and cementite resulting from the transformation of austenite at temperatures below the pearlite range but above M

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

The electrode of an electrolytic cell at which reduction is the principal reaction. (Electrons How toward the cathode in the external circuit.) Typical cathodic processes are cation' taking up electrons and being discharged, oxygen being reduced. and the ...

The relative humidity above which the atmospheric corrosion rate of some metals increases sharply.

Zinc oxide: the powdery product of corrosion of zinc or zinc-coated surfaces.

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.

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

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

A list of elements arranged according to their standard electrode potentials, with "noble" metals such as gold being positive and "active" metals such as zinc being negative.