Accession Number : AD0738496

Title :   Twinning in Niobium, a Continuous Nucleation Theory.

Descriptive Note : Final technical rept. 1 Feb-31 Jan 72,

Corporate Author : WESTINGHOUSE ELECTRIC CORP PITTSBURGH PA RESEARCH AND DEVELOPMENT CENTER

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

Report Date : 01 MAR 1972

Pagination or Media Count : 33

Abstract : The energy required to form a twin in Nb has been experimentally determined to be of the order 1 billion ergs/cc. This high energy has been explained in terms of a continuous nucleation theory which also accounts for the observed morphology of twins in B.C.C. transition metals and the heat evolved in the process. (Author)

Descriptors :   (*TWINNING(CRYSTALLOGRAPHY), NIOBIUM), SINGLE CRYSTALS, NUCLEATION, ENERGY, DISLOCATIONS, MECHANICAL PROPERTIES, GRAIN STRUCTURES(METALLURGY)

Subject Categories : Metallurgy and Metallography
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE