Theoretical studies of Ni/sub 3/Al and NiAl with impurities
Intermetallic compound has been extensively studied because of their superior properties in strength, low creep rate, and high melting point. But most of the systems have room temperature ductility problems, like Ll/sub 2/ and B2 compounds. Both Ll/sub 2/ Ni/sub 3/Al and B2 NiAl exhibit intergranular fracture mode. Understanding grain boundaries in these materials is of particular importance since intergranular fracture limits the applicability of these otherwise promising material. In an effort trying to understand the fracture mechanism, we have used embedded atom potentials to study the properties of Ni/sub 3/Al and NiAl. We also consider the effect of boron, sulfur, and nickel segregation on the strength of grain boundaries in Ni/sub 3/Al and NiAl. 22 refs., 2 figs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6445913
- Report Number(s):
- LA-UR-89-218; CONF-881155-42; ON: DE89006556
- Country of Publication:
- United States
- Language:
- English
Similar Records
Intergranular fracture and boron effects in Ni sub 3 Al and other intermetallics; Introductory paper
Theoretical studies of grain boundaries in Ni/sub 3/Al with boron or sulfur
Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BORON
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DUCTILITY
ELEMENTS
FRACTURE MECHANICS
GRAIN BOUNDARIES
IMPURITIES
MECHANICAL PROPERTIES
MECHANICS
MICROSTRUCTURE
NICKEL ALLOYS
NONMETALS
POINT DEFECTS
SEMIMETALS
STRESS ANALYSIS
SULFUR
TENSILE PROPERTIES