Accession Number : AD0681864

Title :   TWINNING AND THE LOW TEMPERATURE MECHANICAL PROPERTIES OF POLYCRYSTALLINE NIOBIUM, MOLYBDENUM AND NbMo ALLOYS.

Descriptive Note : Interim technical rept.,

Corporate Author : WESTINGHOUSE RESEARCH LABS PITTSBURGH PA

Personal Author(s) : Shaw,B. J.

Report Date : 31 JAN 1969

Pagination or Media Count : 40

Abstract : Mechanical tests in compression and tension over a range of temperatures embracing the ductile-brittle transition temperature have been done on irradiated and non-irradiated molybdenum and three alloys of niobium-molybdenum. Stress-relaxation tests in conjunction with these have been interpreted to show that gross slip and twinning are not involved in the initiation of fracture in those brittle materials. It is also deduced that irradiation damage and alloying act in a similar manner in inhibiting slip and twinning. It was concluded that the propagation energy is a predominant factor in twinning. (Author)

Descriptors :   (*NIOBIUM ALLOYS, MECHANICAL PROPERTIES), (*MOLYBDENUM ALLOYS, MECHANICAL PROPERTIES), LOW TEMPERATURE, DUCTILE BRITTLE TRANSITION, TWINNING(CRYSTALLOGRAPHY), FRACTOGRAPHY, STRESSES, STRAIN(MECHANICS), COMPRESSIVE PROPERTIES, TENSILE PROPERTIES, CRYSTALLOGRAPHY, DAMAGE, RADIATION EFFECTS, STRAIN GAGES, DISLOCATIONS

Subject Categories : Metallurgy and Metallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE