Accession Number : AD0286880

Title :   EFFECT OF BASIC PHYSICAL PARAMETERS ON ENGINEERING PROPERTIES OF INTERMETALLICS

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY N Y

Personal Author(s) : WESTBROOK,J.H. ; WOOD,D.L.

Report Date : JUL 1962

Pagination or Media Count : 1

Abstract : An increased har ness of grain boundary regio s above that of the bulk material is found to exist generally in intermetallic compounds having a stoichiometric excess of active metal component. This hardening is shown to be associated with the anomalously high brittle-ductile transition temperature in these materials, and to be related to the 'pest' phenomenon. The presence of adsorbed oxygen an /or nitrogen in grain boundary regions is found to be responsible for the i creased hardness in these areas; the precise manner in which the resistance to plastic deformation is increased in this phenomenon is ot clear. The effect can be modified by ternary solute additions and to some extent by appropriate annealing reatments. (Author)

Descriptors :   *INTERMETALLIC COMPOUNDS, ALUMINUM COMPOUNDS, BERYLLIUM COMPOUNDS, BRITTLENESS, CHROMIUM COMPOUNDS, COBALT COMPOUNDS, DEFORMATION, ELECTRON MICROSCOPY, FRACTURE (MECHANICS), GRAIN STRUCTURES (METALLURGY), HARDNESS, HEAT TREATMENT, IRIDIUM COMPOUNDS, MAGNESIUM COMPOUNDS, METAL CRYSTALS, MOLYBDENUM COMPOUNDS, NICKEL COMPOUNDS, NITROGEN, OXYGEN, SILICON COMPOUNDS, SILVER COMPOUNDS, TANTALUM COMPOUNDS, TITANIUM COMPOUNDS, TRANSITION TEMPERATURE, ZIRCONIUM COMPOUNDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE