Elasticity: The property of recovering original shape and dimensions upon removal of a deforming force.
Elastic Limit: Maximum stress that a material will withstand without permanent deformation. See Yield Strength.
Electrical Precipitator: In air pollution control, the use of electrodes in stack emissions emitting high voltage; particles 0.1 micron and smaller can
be attached and collected at discharge electrode.
Electrochemical Corrosion (Contact Corrosion, Electrolytic Corrosion, Galvanic Corrosion): Localized corrosion from,exposure of an assembly of
dissimilar metals in contact or coupled with one another, i.e., electrochemical action.
Electrode: Compressed graphite or carbon cylinder or rod used to conduct electric current in electric arc furnaces, arc lamps, carbon arc welding, etc.
Electron Microprobe Analyzer: An instrument for selective analysis of a microscopic area, in which an electron beam bombards the point of interest in Vacuo at a given energy level. Intensity of backscatter is measured to interpret which chemical elements are present and by scanning a large area the
microprobe can analyze chemical composition and indicate the distribution of an element.
Elongation: Amount of permanent extension in the vicinity of the fractures in the tensile test; usually expressed as a percentage of original gage length,
such as 25 percent in 2 in.
Embrittlement: Loss of ductility. See Acid Embrittlement, Hydrogen Embrittlement.
Endothermic Reaction: Designating, or pertaining to a reaction which occurs with absorption of heat from the surroundings; as an endothermic substance.
Equilibrium: A dynamic condition of balance between atomic movements, where the resultant is zero and the condition appears to be one of rest rather
Erosion: Abrasion of metal or other material by liquid or gas, usually accelerated by pressure of solid particles of matter in suspension, and sometimes
Etchant: A solution for chemical etching the polished surface of a metal specimen to reveal macro- or microstructures when viewed under microscope.
Exothermic: Formed by or characterized by heat reaction, as in oxidation.
Exothermic Reaction: Chemical reactions involving the liberation of heat; such as burning of fuel, deoxidizing of iron with aluminum, and a characteristic
of many feeder or riser compounds. See Endothermic Reaction.
Extensometer: An instrument used in the testing of metals to measure small increments of deformation.