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:

1972-03-01

Pagination or Media Count:

33.0

Abstract:

The energy required to form a twin in Nb has been experimentally determined to be of the order 1 billion ergscc. 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