Accession Number : AD0700338
Title : LOW TEMPERATURE MECHANICAL PROPERTIES OF POLYCRYSTALLINE NIOBIUM AND MOLYBDENUM.
Descriptive Note : Interim technical rept. 1 Feb 69-31 Jan 70,
Corporate Author : WESTINGHOUSE RESEARCH LABS PITTSBURGH PA
Personal Author(s) : Shaw,B. J.
Report Date : 31 JAN 1970
Pagination or Media Count : 24
Abstract : The energy of twinning was found for polycrystalline niobium specimens at -196C. These results derived from 'dead-load' tests on a modified creep machine compared with previous estimates derived from stress relaxation tests and gave an energy of the order of 10 to the 9th power ergs/cu cm. This high energy value and the metallographic features of twinning were explained in terms of a continuous nucleation theory of twinning. Initial experimental results from piezoelectric strain gauges were also given. (Author)
Descriptors : (*NIOBIUM, *TWINNING(CRYSTALLOGRAPHY)), (*PIEZOELECTRIC GAGES, VAPOR PLATING), CRYOGENICS, MOLYBDENUM, STRAIN GAGES, ENERGY, MECHANICAL PROPERTIES
Subject Categories : Metallurgy and Metallography
Distribution Statement : APPROVED FOR PUBLIC RELEASE