Characterization of extrinsic grain-boundary dislocations and grain-boundary dislocation sources by transmission electron microscopy. Final report, June 1, 1979-May 31, 1981

Technical Report · Mon Jun 01 00:00:00 EDT 1981

DOI:https://doi.org/10.2172/6509433· OSTI ID:6509433

Murr, L E

The microstructures attendant to specific peak strains along the strain axis of the stress-strain diagram for type 304 stainless steel and nickel have been examined and compared by transmission electron microscopy from epsilon = 0.05% to 55% in the former and from epsilon = 0.05% to 35% in the latter. The onset of flow is characterized by the emission of dislocations from grain boundary ledge source which form emission profiles resembling dislocation pileups in the stainless steel, and a random distribution of dislocations with evidence for very short emission profiles near the grain boundaries in nickel. At the engineering yield point (0.2%) every grain in the stainless steel shows evidence for dislocation emission profiles, while in the nickel every grain contains some dislocations distributed within the grain interior.

• Research Organization: New Mexico Inst. of Mining and Technology, Socorro (USA). Dept. of Metallurgical and Materials Engineering
• Sponsoring Organization: USDOE Office of Basic Energy Sciences
• DOE Contract Number: AC04-79AL10887
• OSTI ID: 6509433
• Report Number(s): DOE/AL/10887-T2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL
GRAIN BOUNDARIES
MICROSTRUCTURE
STAINLESS STEEL-304
ELECTRON MICROSCOPY
STRAINS
STRESSES
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
METALS
MICROSCOPY
NICKEL ALLOYS
STAINLESS STEELS
STEELS
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies