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
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE