Mechanical behavior of Ni{sub 3}Al: Effects of environment, strain rate, temperature and boron doping

Journal Article · Wed May 01 04:00:00 EDT 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(95)00331-2· OSTI ID:247935

George, E P; Liu, C T ^[1]; Pope, D P ^[2]

---

1. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.
2. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering

The mechanical behavior of polycrystalline Ni{sub 3}Al was studied as functions of environment, strain rate, temperature and boron doping. The authors find that the ductility of boron-free Ni{sub 3}Al increases with increasing strain rate, increasing (or decreasing) temperature from room temperature, and decreasing amounts of water vapor in the test environment. The present results are consistent with their earlier conclusion that moisture-induced environmental embrittlement is a major cause of the room-temperature brittleness of Ni{sub 3}Al. The authors also find in the present study that boron suppresses environmental embrittlement in Ni{sub 3}Al; however, its efficacy depends on the amount added. At a level of 100 wppm, it quite effectively suppresses environmental embrittlement, with ductility remaining high and insensitive to strain rate in both air and water. At a level of 50 wppm, however, boron alleviates environmental embrittlement only in air -- in water the ductility is strongly strain-rate sensitive. Boron also affects the fracture mode, tending in general to promote transgranular fracture if present in sufficient quantity.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 247935
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 5 Vol. 44; ISSN XZ504Y; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ALUMINIUM ALLOYS
BORON ADDITIONS
CHEMICAL REACTIONS
CRACKS
DUCTILITY
EMBRITTLEMENT
FRACTURE PROPERTIES
HYDROGEN
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
MONOCRYSTALS
NICKEL ALLOYS
WATER