Environmental embrittlement and grain-boundary fracture in Ni sub 3 Al

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(92)90313-4· OSTI ID:7030734

Liu, C T ^[1]

---

1. Metals and Ceramics Div., Oak Ridge National Lab., Oak Ridge, TN (US)

Recent studies have demonstrated that many ordered intermetallics exhibit environmental embrittlement when tested in air at ambient temperatures. Brittle grain-boundary fracture and poor ductility have been observed in a number of binary ordered intermetallics with an L1{sub 2} ordered crystal structure such as Ni{sub 3}Al, Ni{sub 3}Si, Ni{sub 3}Ge, and Ni{sub 3}Ga. The grain boundaries in the alloys have been considered to be intrinsically brittle, as evidenced by detailed Auger analyses and as suggested by atomic-simulation calculations. In this paper the study of environmental embrittlement at room temperature is extended to include binary Ni{sub 3}Al. The present results also show that moisture-induced hydrogen embrittlement contributes substantially to brittle grain-boundary fracture and low tensile ductility in Ni{sub 3}Al containing 24 and 23.5at.% Al, prepared by repeated cold forging and annealing of cast-alloy ingots.

• OSTI ID: 7030734
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 27:1; ISSN SCRME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
AIR
ALLOY SYSTEMS
ALUMINIUM COMPOUNDS
BCC LATTICES
BINARY ALLOY SYSTEMS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DUCTILITY
ELEMENTS
EMBRITTLEMENT
FAILURES
FLUIDS
FRACTURES
GASES
GRAIN BOUNDARIES
HYDROGEN
HYDROGEN EMBRITTLEMENT
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOISTURE
NICKEL COMPOUNDS
NONMETALS
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS