TWINNING AND THE LOW TEMPERATURE MECHANICAL PROPERTIES OF POLYCRYSTALLINE COLUMBIUM, MOLYBDENUM AND CBMO ALLOYS.
Abstract
Results of the mechanical tests, in compression, tension, and by stress relaxation, on columbium, neutron-irradiated and non-irradiated molybdenum, and three CbMo alloys are discussed. The tests were made in the range 200C to -269C, which covers the ductile-brittle transition temperature of all the polycrystalline materials used. The results indicate that point defects in the crystal lattice inhibit dislocation multiplication mechanisms, thereby increasing the yield and twinning stresses and enhancing the embrittlement. Etch-pit and electron microscopy studies in columbium are described. A theoretical investigation of slip on the b.c.c. (110) and (112) planes is also given.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 1967
- Accession Number
- AD0646682
Entities
People
- B. J. Shaw
Organizations
- Westinghouse Electric Corporation