Grain boundary fracture and alloy design of intermetallics
This paper reviews recent progress in our understanding of brittle grain-boundary (GB) fracture in ordered intermetallics. Different kinds of GB brittleness are considered, including intrinsic intergranular (IG) brittleness, which in alloys like Ni{sub 3}Al is the single major cause of poor ductility and brittle fracture, but in others (like NiAl and FeAl) is not the sole cause. Consequently, although boron suppresses IG fracture in all three intermetallics, it produces dramatic ductilization only in Ni{sub 3}Al and not in FeAl or NiAl. Extrinsic GB brittleness is examined by considering Ni{sub 3}Si, in which environmental embrittlement is a major cause of IG fracture, and the beneficial effect of boron apparently to suppression of that embrittlement. 70 refs., 2 figs., 2 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5295786
- Report Number(s):
- CONF-911240-2; ON: DE91018253
- Country of Publication:
- United States
- Language:
- English
Similar Records
Intergranular fracture and boron effects in Ni sub 3 Al and other intermetallics; Introductory paper
Environmental embrittlement and grain-boundary fracture in Ni sub 3 Si
Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BORON
BRITTLENESS
CRYSTAL STRUCTURE
DUCTILITY
ELEMENTS
FRACTURE PROPERTIES
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
SEMIMETALS
TENSILE PROPERTIES