Catastrophic brittle failure of a normally ductile metal when in contact with a liquid metal and subsequently stressed in tension.

Corrosion due to the action of "local cells," that is, galvanic cells resulting from inhomogeneities between adjacent areas on a metal surface exposed to an electrolyte.

A galvanic cell resulting from inhomogeneities between areas on a metal surface in an electrolyte. The inhomogeneities may be of physical or chemical nature in either the metal or its environment.

Corrosion at discrete sites, stress-corrosion cracking.

Current that flows through the earth from an anodic to a cathodic area of a continuous metallic structure. Usually used only where the areas are separated by considerable distance and where the current results from concentration-cell action.

A small tube or capillary filled with electrolyte, terminating close to the metal surface under study, and used to provide an ionically conducting path without diffusion between an electrode under study and a reference electrode.

Visible at magnifications to 25x.

The structure of metals as revealed by macroscopic examination of the etched surface of a polished specimen.

Naturally occurring magnetic oxide of iron (Fe3O4).

A generic term for microstructures formed by diffusionless phase transformation in which the parent and product phases have a specific crystallographic relationship. Martensite is characterized by an acicular pattern in the microstructure in both ferrous ...

Plating wherein fine metal powders are peened onto the work by tumbling or other means.

Accelerated deterioration of metals in carbonaceous gases at elevated temperatures to form a dustlike corrosion product; a unique form of high temperature corrosion which forms a dust-like corrosion product and sometimes develops hemispherical pits on a s ...

A galvanic cell caused by a difference in metal ion concentration at two locations on the same metal surface.

An alloy having an amorphous or glassy structure. See also amorphous solid.

(1) The application of an electrically conductive metallic layer to the surface of nonconductors. (2) The application of metallic coatings by nonelectrolytic procedures such us spraying of molten metal and deposition from the vapor phase.

Perforation of material in outer space resulting from meteor strikes.

See biological corrosion.

Visible at magnifications above 25x.

The structure of a prepared surface of a metal as revealed by a microscope at a magnification exceeding 25x.

The heavy oxide layer formed during hot fabrication or heat treatment of metals.