Application of microdynamics and lattice mechanics to problems in plastic flow and fracture. Final report, 1 April 1973--31 March 1978

Technical Report · Wed Jun 21 00:00:00 EDT 1978

DOI:https://doi.org/10.2172/6283604· OSTI ID:6283604

Bilello, J C; Liu, J M

Progress in an investigation of the application of microdynamics and lattice mechanics to the problems in plastic flow and fracture is described. The research program consisted of both theoretical formulations and experimental measurements of a number of intrinsic material parameters in bcc metals and alloys including surface energy, phonon-dispersion curves for dislocated solids, dislocation-point defect interaction energy, slip initiation and microplastic flow behavior. The study has resulted in an improved understanding in the relationship among the experimentally determined fracture surface energy, the intrinsic cohesive energy between atomic planes, and the plastic deformation associated with the initial stages of crack propagation. The values of intrinsic surface energy of tungsten, molybdenum, niobium and niobium-molybdenum alloys, deduced from the measurements, serve as a starting point from which fracture toughness of these materials in engineering service may be intelligently discussed.

• Research Organization: State Univ. of New York, Stony Brook (USA). Dept. of Materials Science
• Sponsoring Organization: USDOE
• DOE Contract Number: EY-76-S-02-3476
• OSTI ID: 6283604
• Report Number(s): COO-3476-16; TRN: 79-009115
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MOLYBDENUM
CRYSTAL STRUCTURE
FRACTURE PROPERTIES
MOLYBDENUM ALLOYS
NIOBIUM
NIOBIUM ALLOYS
TUNGSTEN
CRACKS
DISLOCATIONS
PLASTICITY
ALLOYS
CRYSTAL DEFECTS
ELEMENTS
LINE DEFECTS
MECHANICAL PROPERTIES
METALS
REFRACTORY METALS
TRANSITION ELEMENTS
360103* - Metals & Alloys- Mechanical Properties
360104 - Metals & Alloys- Physical Properties