Accession Number : AD0475775

Title :   ULTRAHIGH VACUUM EFFECTS ON THE MECHANICAL BEHAVIOR OF METALS.

Descriptive Note : Technical documentary rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS

Personal Author(s) : Feuerstein, S. ; Rice, L.

Report Date : NOV 1965

Pagination or Media Count : 23

Abstract : The effect of low pressures on the flow and fracture behavior of molybdenum is described. For polycrystalline samples, room temperature tensile tests indicate greater ductility under 10 to the minus 10th power Torr than under intermediate pressures up to and including atmospheric pressure (760 Torr). In addition, tests conducted at 760 Torr under atmospheres of air, dry nitrogen, and purified argon exhibited no apparent difference in mechanical properties. Critical tests involving baking in situ as well as those involving single crystal deformation further imply that the ductility effect is a pressure dependent phenomenon related only to the fracture process. This dependency is discussed in terms of adsorption and diffusion contributions. (Author)

Descriptors :   *LOW PRESSURE), *MOLYBDENUM), (*MECHANICAL PROPERTIES, (*FRACTURE(MECHANICS), TENSILE PROPERTIES, DUCTILITY, PRESSURE, BAROMETRIC PRESSURE, NITROGEN, ARGON, ADSORPTION, DIFFUSION, ENVIRONMENTAL TESTS, ZINC, CADMIUM, GOLD, COPPER, NICKEL, VACUUM, HIGH PRESSURE, STRESSES, PROPAGATION.

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE